CN112500087B - A kind of high-strength and high-toughness permeable cement concrete and preparation method thereof - Google Patents
A kind of high-strength and high-toughness permeable cement concrete and preparation method thereofDownload PDFInfo
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- CN112500087B CN112500087BCN202011550348.XACN202011550348ACN112500087BCN 112500087 BCN112500087 BCN 112500087BCN 202011550348 ACN202011550348 ACN 202011550348ACN 112500087 BCN112500087 BCN 112500087B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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Abstract
Description
Technical Field
The invention relates to high-strength high-toughness permeable cement concrete and a preparation method thereof, belonging to the field of concrete materials.
Background
The permeable cement concrete is used as a novel and ecological environment-friendly building material, and has important significance for enlarging the permeable area and the permeable area of a city, adjusting the temperature and the humidity of urban air, recycling rainwater, maintaining the underground water level of soil and ecological balance by utilizing the internal pore structure of the permeable cement concrete. Therefore, the method has good application prospect in the construction of sponge cities.
At present, the pervious cement concrete is mainly used for paving light-load roads, such as urban green roads, landscape roads, pedestrian auxiliary roads, non-motor vehicle lanes, squares, ecological parking lots and the like, due to low mechanical properties (the compressive strength grade is less than C30). The improvement of the mechanical properties of the pervious cement concrete is a precondition that the pervious cement concrete can be used for heavy-duty roads (large highways, tunnels, bridges and the like). This requires that the pervious cement concrete have high strength and good toughness (deformability), since high strength is the basic condition for meeting heavy-duty requirements (usually requiring a compressive strength grade not lower than C45), and high toughness is a necessary method for avoiding cracking of the paving material due to deformation.
The pervious cement concrete is usually prepared by mixing coarse aggregate, a cementing material and water, and a porous cellular structure with certain strength is formed by coating a layer of the cementing material on the surface of the coarse aggregate and mutually bonding the cementing material. Therefore, the overall mechanical properties (strength, toughness, etc.) of pervious cement concrete are mainly determined by the binding capacity of the cement between the aggregates and the mechanical properties of the cement itself. This is the mechanism of formation of mechanical properties of pervious cement concrete.
Based on the above mechanism, patent application CN110696184A discloses a method for preparing high-strength water-permeable cement concrete. The method is characterized in that a certain inorganic reinforcing agent is doped to excite the activity of cement, so that the strength of concrete after the cementing material is bonded with stone is improved, and the permeable cement concrete with the grade of C40 can be prepared. However, the technical problem of poor toughness of pervious cement concrete is not solved, because the method does not consider the toughness of the cementitious material itself.
Based on the above mechanism, patent application CN110002811A discloses a high-strength and high-water-permeability concrete and a preparation method thereof. According to the method, the polyurethane resin emulsion is doped to improve the bonding capacity of the cementing material, so that the compressive strength and the tensile strength of the permeable cement concrete are improved. However, the polyurethane resin emulsion belongs to an organic adhesive, and the weather resistance and the long-term stability of the polyurethane resin emulsion are poor, so that the stability of the long-term performance of the permeable cement concrete prepared by the polyurethane resin emulsion is still required to be further clarified. In addition, the method also does not solve the technical problem of poor toughness of the pervious cement concrete.
Based on the mechanism, the patent application CN106830838A discloses an ultrahigh-strength cementing material and high-performance pervious concrete prepared from the same. The method adopts cement, micro silicon, silicon powder, water and a water reducing agent to form the ultra-high strength cementing material, and the compressive strength of the ultra-high strength cementing material reaches more than 150 MPa. However, the strength grades of the pervious cement concrete prepared by adopting the ultrahigh-strength cementing material in the examples are all lower than C30, which indicates that although the strength of the cementing material provided by the method is high, the cementing capability between the cementing material and coarse aggregate is poor, so that the strength of the prepared pervious cement concrete is low, and the basic requirements of the high-strength pervious cement concrete can not be met obviously. Meanwhile, although the cementing material provided by the method has ultrahigh strength, the technical problem of poor toughness of the pervious cement concrete is not solved.
Based on the above mechanism, patent application CN106186926A discloses a high-strength pervious concrete admixture and pervious concrete. According to the method, the strength of the cementing material is improved by adopting the additive consisting of redispersible rubber powder, gypsum powder, a water reducing agent and a nano composite filler, so that the strength of the pervious cement concrete is improved, and the compressive strength of the prepared pervious concrete reaches about 40 MPa. Similarly, the method does not solve the technical problem of poor toughness of pervious cement concrete.
Based on the above mechanism, patent application CN106220050A discloses a high-strength fiber water-permeable concrete. The method for improving the strength is consistent with the method of the patent application CN106186926A, except that the method of the patent application CN106220050A adds polypropylene fiber at the same time. Although the examples of patent application CN106220050A do not clearly show the toughness index of the formulated polypropylene fiber pervious cement concrete, from the basic principle and basic knowledge of fiber concrete, the addition of polypropylene fiber will have some improvement effect on the toughness of the material. However, polypropylene fibers are not a reasonable concrete toughening material. The polypropylene fiber has high elongation and low strength and elastic modulus, so that the toughness of hardened concrete cannot be effectively improved, and the polypropylene fiber is more used for improving the early-age plastic shrinkage of the concrete material and the anti-cracking capability of the concrete material in case of fire.
It can be found from the above analysis of the related documents that the prior art means are not sufficient to obtain both high strength and high toughness in pervious cement concrete. However, higher strength and better toughness are the basic premise that the pervious cement concrete can be applied to paving a heavy-duty road. Therefore, it is necessary to obtain a high-strength and high-toughness permeable cement concrete.
Disclosure of Invention
Aiming at the technical problem that the high-strength pervious cement concrete is poor in toughness, the invention starts from a forming mechanism of mechanical properties of the pervious cement concrete, and improves the improvement effect of the high-strength pervious cement concrete on the strength, the toughness and the bonding capability of a pervious cement concrete cementing material by introducing calcium carbonate whiskers with high strength and high elastic modulus as a microcosmic reinforcing material and assisting an inorganic gelling agent; meanwhile, ultrashort-cut polyethylene fibers are introduced as a macroscopic reinforcing material, and the crack resistance and the deformation capacity of the cementing material are further improved, so that the high-strength high-toughness permeable cement concrete material is invented, the technical problem of poor toughness of the permeable cement concrete is fundamentally solved, and the permeable cement concrete material is balanced and unified in high strength and high toughness.
In order to achieve the above objects, the present invention firstly provides a high strength and high toughness permeable cement concrete comprising cement, silica fume, mineral powder, machine-made sand, stones, ultra-short cut Polyethylene (PE) fibers, calcium carbonate whiskers, a water reducing agent, hydroxyethyl cellulose, an inorganic gelling agent, an antifoaming agent and water,
wherein the dosage of each component is as follows:
the dosage of the components is kg/m3
335 to 385 of cement
14.3-19.2 parts of silica fume
36.5-52.5 parts of mineral powder
155-195 mechanical sand
1300-1500 stones
Ultra-short PE fiber 0.97-2.91
7.15-14.3 parts of calcium carbonate whisker
2.8-5.6 parts of water reducing agent
0.08 to 0.15% by weight of hydroxyethyl cellulose
10-15 parts of inorganic gelling agent
0.1-0.15% of defoaming agent
96.5-115% of water.
Further, the cement includes any one of portland cement, ordinary portland cement, portland slag cement, pozzolanic portland cement, portland fly ash cement, or composite portland cement.
Furthermore, the cement is preferably P.O 52.5 type ordinary portland cement which has good compatibility with a polycarboxylic acid high-efficiency water reducing agent.
Further, the mass percent of silicon dioxide in the silica fume is not less than 96%, the average particle size is 0.05-0.2 mu m, and the specific surface area is not less than 17000m2/kg。
Furthermore, the 28-day activity index of the mineral powder is not less than 105%, and the specific surface area is not less than 500m2/kg。
Furthermore, the particle size of the stones is 5-8 mm, and the stones are made of one or two of basalt and granite.
Furthermore, the machine-made sand belongs to medium sand, and the fineness modulus is 2.5-2.8.
Furthermore, the diameter of the ultra-short PE fiber is 30-40 μm, the length of the ultra-short PE fiber is 2-5 mm, and the tensile strength of the ultra-short PE fiber is not less than 3000 MPa.
Furthermore, the calcium carbonate whisker has a diameter of 0.5-2 μm, a length of 20-30 μm and an elastic modulus of 410-710 GPa.
Further, the calcium carbonate whiskers are preferably aragonite-type calcium carbonate whiskers.
Further, the water reducing agent is preferably a polycarboxylic acid high-efficiency water reducing agent.
Further, the inorganic gelling agent is a gelling agent synthesized by 'a pervious concrete gelling agent' in patent technology of granted publication No. CN 110304858B.
Secondly, the invention improves the preparation method of the high-strength high-toughness pervious cement concrete, which comprises the following steps:
(1) accurately weighing raw materials in proportion;
(2) mixing and dispersing 10-20% of water, calcium carbonate whiskers and hydroxyethyl cellulose to obtain a calcium carbonate whisker dispersion suspension;
(3) mixing a water reducing agent and an inorganic gelling agent with 5-10% of water;
(4) mixing and stirring cement, silica fume and mineral powder;
(5) adding the balance water and the material obtained in the step (3) into the material obtained in the step (4) at the same time, and mixing and stirring;
(6) adding the material obtained in the step (2) into the material obtained in the step (5), and mixing and stirring;
(7) adding the ultra-short PE fibers into the material obtained in the step (6), and mixing and stirring;
(8) adding a defoaming agent into the material obtained in the step (7), and mixing and stirring;
(9) adding the machine-made sand into the material obtained in the step (8), and mixing and stirring;
(10) and (4) adding stones into the material obtained in the step (9), and uniformly mixing the stones with the material to obtain the high-strength high-toughness pervious cement concrete.
Further, the preferable dispersing method in the step (2) is ultrasonic dispersion, the ultrasonic frequency is 19-26 kHz, and the ultrasonic time is 10-15 min.
Further, stirring is carried out for 3-5 min in the mixing process in the step (3), and the stirring speed is 50-70 r/min.
Further, in the step (4), mixing and stirring are carried out for 1-2 min at a stirring speed of 50-70 r/min, the stirring equipment in the step is preferably a concrete horizontal stirrer and is provided with a cover, so that loss of powder materials in the stirring process is prevented.
Further, in the step (5), stirring is carried out for 2-3 min at a stirring speed of 50-70 r/min, and preferably, mixing and stirring are carried out in a concrete horizontal stirrer.
Further, in the step (6), stirring is carried out for 2-3 min at a stirring speed of 50-70 r/min, and preferably, mixing and stirring are carried out in a concrete horizontal stirrer.
Further, in the step (7), stirring is carried out for 3-5 min at a stirring speed of 50-70 r/min, and preferably, mixing and stirring are carried out in a concrete horizontal stirrer.
Further, in the step (8), stirring is carried out for 0.5-1 min at a stirring speed of 50-70 r/min, and preferably, mixing and stirring are carried out in a concrete horizontal stirrer.
Further, in the step (9), preferably, a concrete horizontal mixer is adopted for mixing for 1-2 min, and the mixing speed is 50-70 r/min.
Further, in the step (9), preferably, a concrete horizontal mixer is adopted for mixing for 1-2 min, and the mixing speed is 50-70 r/min.
The invention also provides a building part containing the high-strength high-toughness pervious cement concrete.
The invention also provides application of the high-strength high-toughness pervious cement concrete or the preparation method thereof in the field of buildings.
Compared with the prior art, the invention has the following advantages:
the high-strength high-toughness permeable cement concrete provided by the invention has the most remarkable advantages that the compressive strength can stably reach more than 55MPa, and is obviously superior to the high-strength permeable cement concrete material disclosed in China at present; meanwhile, the ultimate tensile strain of the high-strength high-toughness pervious cement concrete provided by the invention can stably reach over 0.35 percent, which is more than 30 times of the ultimate tensile strain of the ordinary pervious cement concrete, so that the technical problem of poor toughness of the pervious cement concrete is fundamentally solved, and the pervious cement concrete material realizes balance and unification in high strength and high toughness.
Detailed Description
The hydroxyethyl cellulose is selected from QP-300H series hydroxyethyl cellulose produced by Cellosize company; the polycarboxylic acid high-efficiency water reducing agent is selected from Viscocrete-540P series water reducing agents produced by Sika company; the antifoaming agent is selected from DF6352DD series antifoaming agent manufactured by AXILAT company; the inorganic gelling agent is prepared by a method of 'a pervious concrete gelling agent' in the patent technology of the granted publication No. CN 110304858B, and the preparation method of the embodiment 1 is specifically selected; the silica fume is purchased from platinum-based New materials science and technology limited; the mineral powder is purchased from platinum-lubricating new material science and technology limited; the calcium carbonate crystal whisker is purchased from Shanghai pelargonium composite new material science and technology company Limited; PE fiber was purchased from a special rope reel, Splendid, model ZTD77, available from Dongguan.
Testing the compressive strength and ultimate tensile strain of the prepared permeable cement concrete according to the method specified in GB/T50081-2002 standard of mechanical property test method of common concrete;
and testing the water permeability coefficient of the prepared water permeable cement concrete according to a testing method specified in DB11/T775-2010 permeable concrete pavement technical regulation.
For a better understanding of the present invention, the following examples are given to further illustrate the present invention, but the present invention is not limited to the following examples.
Examples 1 to 3
The raw materials of the high-strength high-toughness permeable cement concrete comprise cement, silica fume, mineral powder, machine-made sand, stones, ultra-short cut Polyethylene (PE) fibers, aragonite type calcium carbonate whiskers, a polycarboxylic acid high-efficiency water reducing agent, hydroxyethyl cellulose, an inorganic gelling agent, an antifoaming agent and water. The following examples all selected raw materials were in accordance with the specification in the claims and were carried out in the proportions shown in Table 1 for 3 groups of examples.
TABLE 1 raw material ratio (kg/m) for concrete of examples 1 to 33)
In the implementation process, the raw materials are accurately weighed according to the mixing ratio shown in the table 1. Mixing 20% water with calcium carbonate whisker and hydroxyethyl cellulose, and ultrasonically dispersing for 12min by using an integrated ultrasonic processor (brand: required by prescription, model: PZ-2000L) to obtain a material A. And (3) mixing the polycarboxylic acid high-efficiency water reducing agent and the inorganic gelling agent with 10% of water, manually stirring for 4min at normal temperature, and stirring at the speed of 50 r/min to obtain a material B. All the cement, silica fume and mineral powder are mixed and stirred in a concrete horizontal stirrer (HJW-60, the model of which is Hebei Xin Nam Sheng instruments and Equipment Co., Ltd.) for 2min at a stirring speed of 70 r/min to obtain a material C. Adding the rest water and the material B, and continuously stirring at normal temperature for 2min at the stirring speed of 70 r/min. And then adding the material A, and continuing stirring at normal temperature for 3min, wherein the stirring speed is 70 r/min. And then adding all the ultra-short PE fibers, and continuously stirring for 4min at normal temperature, wherein the stirring speed is 70 r/min. Then, all the defoaming agents are added, and the mixture is stirred for 1min at normal temperature, wherein the stirring speed is 70 r/min. Then, all the machine-made sand is added, and the stirring is continued for 1min at normal temperature, and the stirring speed is 70 r/min. And finally, adding all the stones, and continuing stirring at normal temperature for 2min at the stirring speed of 70 r/min to obtain the materials of the various groups of embodiments.
The materials of each group of examples are molded and maintained according to standard DB11/T775-2010 technical specification of pervious concrete pavements and standard GB/T50081-2002 standard of testing method of mechanical properties of common concrete, and a compression test, a tensile test and a water permeability coefficient test are carried out at the age of 28 d. The test results are shown in table 2.
TABLE 2 test results of compressive strength, ultimate tensile strain and water permeability coefficient of the concretes of examples 1 to 3
The test result shows that: 28d compressive strength of the high-strength high-toughness pervious cement concrete prepared by the three mixing ratios given in the embodiment exceeds 55MPa, and can reach 65.5MPa to the maximum; the ultimate tensile strain exceeds 0.35 percent and can reach 0.412 percent at most; the water permeability coefficients are all over 1.1mm/s and can reach 1.64mm/s at most, and the basic requirements (not less than 0.5mm/s) of the pervious concrete are met. Therefore, the strength and toughness of the high-strength high-toughness pervious cement concrete disclosed by the invention are far higher than the indexes of the prior domestic common high-strength pervious cement concrete, the technical problem of poor toughness of the pervious cement concrete is fundamentally solved, the high strength and the high toughness of the pervious cement concrete material are balanced and unified, and a foundation is laid for the application of the pervious cement concrete in paving a heavy-duty road.
Comparative example 1
The comparative example selects cement, silica fume, mineral powder, stones, machine-made sand, ultra-short cut Polyethylene (PE) fibers, polycarboxylic acid high-efficiency water reducing agent, defoaming agent and water as raw materials, all the raw materials meet the requirements in the invention content, and the mixing proportion is implemented according to the table 3.
TABLE 3 compounding ratios used in comparative example 1(kg/m3Wherein the cement is P.O 52.5 type ordinary portland cement)
In the implementation process, the raw materials are accurately weighed according to the mixing ratio shown in the table 3. And (3) mixing the polycarboxylic acid high-efficiency water reducing agent with 10% of water, and manually stirring at normal temperature for 4min at a stirring speed of 50 rpm to obtain a material A. All the cement, silica fume and mineral powder are mixed and stirred in a concrete horizontal stirrer (HJW-60, the model of which is Hebei Xin Nam Sheng instruments Co., Ltd.) for 2min at a stirring speed of 70 r/min to obtain a material B. Adding the balance of water and the material A, and continuously stirring at normal temperature for 2min at the stirring speed of 70 r/min. And then adding all the ultra-short PE fibers, and continuously stirring for 4min at normal temperature, wherein the stirring speed is 70 r/min. Then, all the defoaming agents are added, and the mixture is stirred for 1min at normal temperature, wherein the stirring speed is 70 r/min. Then, all the machine-made sand is added, and the stirring is continued for 1min at normal temperature, and the stirring speed is 70 r/min. And finally, adding all the stones, and continuing stirring at normal temperature for 2min at the stirring speed of 70 r/min to obtain the material of the comparative example 1.
Forming and maintaining according to standard DB11/T775-2010 permeable concrete pavement technical rules and standard GB/T50081-2002 common concrete mechanical property test method standards, and performing compression test, tensile test and water permeability coefficient test at 28d age. The test results are shown in table 4.
Table 4 test results of compressive strength, ultimate tensile strain and water permeability coefficient of comparative example 1
The test result shows that: the permeable cement concrete given in comparative example 1 has a compressive strength of 31.4MPa, an ultimate tensile strain of 0.133% and a permeability coefficient of 1.41mm/s, and although the tensile toughness is improved compared with that of ordinary permeable cement concrete, the permeable cement concrete has a lower compressive strength and is not suitable for paving a heavy-load permeable road.
Comparative example 2
The comparative example selects cement, silica fume, mineral powder, stones, machine-made sand, calcium carbonate whiskers, inorganic gelling agent, hydroxyethyl cellulose, polycarboxylic acid high-efficiency water reducing agent, defoaming agent and water as raw materials, and the raw materials all meet the requirements in the invention content and are implemented according to the mixing ratio in the table 5.
TABLE 5 compounding ratio (kg/m) used in comparative example 23Wherein the cement is P.O 52.5 type ordinary portland cement)
In the implementation process, the raw materials are accurately weighed according to the mixing ratio shown in table 5. Mixing 20% water with calcium carbonate whisker and hydroxyethyl cellulose, and ultrasonically dispersing for 12min by using an integrated ultrasonic processor (brand: required by prescription, model: PZ-2000L) to obtain a material A. And (3) mixing the polycarboxylic acid high-efficiency water reducing agent and the inorganic gelling agent with 10% of water, manually stirring for 4min at normal temperature, and stirring at the speed of 50 r/min to obtain a material B. All the cement, silica fume and mineral powder are mixed and stirred in a concrete horizontal stirrer (HJW-60, the model of which is Hebei Xin Nam Sheng instruments and Equipment Co., Ltd.) for 2min at a stirring speed of 70 r/min to obtain a material C. Adding the rest water and the material B, and continuously stirring at normal temperature for 2min at the stirring speed of 70 r/min. And then adding the material A, and continuing stirring at normal temperature for 3min, wherein the stirring speed is 70 r/min. Then, all the defoaming agents are added, and the mixture is stirred for 1min at normal temperature, wherein the stirring speed is 70 r/min. Then, all the machine-made sand is added, and the stirring is continued for 1min at normal temperature, and the stirring speed is 70 r/min. And finally, adding all the stones, and continuing stirring at normal temperature for 2min at the stirring speed of 70 r/min to obtain the material of the comparative example 2.
Forming and maintaining according to standard DB11/T775-2010 permeable concrete pavement technical rules and standard GB/T50081-2002 common concrete mechanical property test method standards, and performing compression test, tensile test and water permeability coefficient test at 28d age. The test results are shown in table 6.
TABLE 6 test results of compressive strength, ultimate tensile strain and water permeability coefficient of comparative example 2
The test result shows that: the pervious cement concrete given in comparative example 2 has a 28d compressive strength of 52.5MPa, an ultimate tensile strain of 0.019% and a water permeability coefficient of 1.48 mm/s. Although the compressive strength of the concrete is obviously improved compared with that of common permeable cement concrete, the tensile strain of the concrete is only 0.019%, the tensile strain of the concrete is only improved by about 20% compared with that of the common permeable cement concrete, the toughness of the concrete is extremely poor, and the problem of cracking of road pavement is easily caused.
Comparative example 3
The comparative example selects cement, silica fume, mineral powder, stones, machine-made sand, ultra-short cut Polyethylene (PE) fiber, calcium carbonate whisker, hydroxyethyl cellulose, polycarboxylic acid high-efficiency water reducing agent, defoaming agent and water as raw materials, and the raw materials all meet the requirements in the invention content and are implemented according to the mixing ratio in the table 7.
TABLE 7 compounding ratio (kg/m) used in comparative example 33Wherein the cement is P.O 52.5 type ordinary portland cement)
In the implementation process, the raw materials are accurately weighed according to the mixing ratio shown in the table 7. Mixing 20% water with calcium carbonate whisker and hydroxyethyl cellulose, and ultrasonically dispersing for 12min by using an integrated ultrasonic processor (brand: required by prescription, model: PZ-2000L) to obtain a material A. And (3) mixing the polycarboxylic acid high-efficiency water reducing agent with 10% of water, and manually stirring at normal temperature for 4min at the stirring speed of 50 rpm to obtain a material B. All the cement, silica fume and mineral powder are mixed and stirred in a concrete horizontal stirrer (HJW-60, the model of which is Hebei Xin Nam Sheng instruments and Equipment Co., Ltd.) for 2min at a stirring speed of 70 r/min to obtain a material C. Adding the rest water and the material B, and continuously stirring at normal temperature for 2min at the stirring speed of 70 r/min. And then adding the material A, and continuing stirring at normal temperature for 3min, wherein the stirring speed is 70 r/min. And then adding all the ultra-short PE fibers, and continuously stirring for 4min at normal temperature, wherein the stirring speed is 70 r/min. Then, all the defoaming agents are added, and the mixture is stirred for 1min at normal temperature, wherein the stirring speed is 70 r/min. Then, all the machine-made sand is added, and the stirring is continued for 1min at normal temperature, and the stirring speed is 70 r/min. And finally, adding all the stones, and continuing stirring at normal temperature for 2min at the stirring speed of 70 r/min to obtain the material of the comparative example 3.
Forming and maintaining according to standard DB11/T775-2010 permeable concrete pavement technical rules and standard GB/T50081-2002 common concrete mechanical property test method standards, and performing compression test, tensile test and water permeability coefficient test at 28d age. The test results are shown in table 8.
TABLE 8 test results of compressive strength, ultimate tensile strain and water permeability coefficient of comparative example 3
The test result shows that: the pervious cement concrete given in comparative example 3 has a 28d compressive strength of 38.5MPa, an ultimate tensile strain of 0.211% and a permeability coefficient of 1.27 mm/s. Although the tensile toughness is good, the compressive strength is low, and the composite material is not well suitable for paving the heavy-load permeable road.
Comparative example 4
The comparative example selects cement, silica fume, mineral powder, stones, machine-made sand, ultra-short cut Polyethylene (PE) fibers, inorganic gelling agent, polycarboxylic acid high-efficiency water reducing agent, defoaming agent and water as raw materials, and the raw materials all meet the requirements in the invention content and are implemented according to the mixing ratio in Table 9.
TABLE 9 compounding ratio (kg/m) used in comparative example 43Wherein the cement is P.O 52.5 type ordinary portland cement)
In the implementation process, the raw materials are accurately weighed according to the mixing ratio shown in the table 9. Mixing the polycarboxylic acid high-efficiency water reducer and the inorganic gelling agent with 10% of water, manually stirring for 4min at normal temperature, and stirring at the speed of 50 r/min to obtain a material A. All the cement, silica fume and mineral powder are mixed and stirred in a concrete horizontal stirrer (HJW-60, the model of which is Hebei Xin Nam Sheng instruments Co., Ltd.) for 2min at a stirring speed of 70 r/min to obtain a material B. Adding the balance of water and the material A, and continuously stirring at normal temperature for 2min at the stirring speed of 70 r/min. And then adding all the ultra-short PE fibers, and continuously stirring for 4min at normal temperature, wherein the stirring speed is 70 r/min. Then, all the defoaming agents are added, and the mixture is stirred for 1min at normal temperature, wherein the stirring speed is 70 r/min. Then, all the machine-made sand is added, and the stirring is continued for 1min at normal temperature, and the stirring speed is 70 r/min. And finally, adding all the stones, and continuing stirring at normal temperature for 2min at the stirring speed of 70 r/min to obtain the material of the comparative example 4.
Forming and maintaining according to standard DB11/T775-2010 permeable concrete pavement technical rules and standard GB/T50081-2002 common concrete mechanical property test method standards, and performing compression test, tensile test and water permeability coefficient test at 28d age. The test results are shown in table 10.
TABLE 10 test results of compressive strength, ultimate tensile strain and water permeability coefficient of comparative example 4
The test result shows that: the pervious cement concrete given in comparative example 4 has a 28d compressive strength of 42.8MPa, an ultimate tensile strain of 0.170% and a permeability coefficient of 1.34 mm/s. Although the compressive strength and the tensile toughness of the concrete are improved compared with those of common permeable cement concrete, the compressive strength is still low, and the concrete cannot be widely applied to paving of the heavy-load permeable road.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (20)
1. The high-strength high-toughness pervious cement concrete is characterized by comprising cement, silica fume, mineral powder, machine-made sand, stones, ultra-short cut PE fibers, calcium carbonate whiskers, a water reducing agent, hydroxyethyl cellulose, an inorganic gelling agent, an antifoaming agent and water, wherein the dosage of each component is as follows:
the dosage of the components is kg/m3
335 to 385 of cement
14.3-19.2 parts of silica fume
36.5-52.5 parts of mineral powder
155-195 mechanical sand
1300-1500 stones
Ultra-short PE fiber 0.97-2.91
7.15-14.3 parts of calcium carbonate whisker
2.8-5.6 parts of water reducing agent
0.08 to 0.15% by weight of hydroxyethyl cellulose
10-15 parts of inorganic gelling agent
0.1-0.15% of defoaming agent
96.5-115% of water.
2. The high strength and high toughness pervious cement concrete according to claim 1, wherein said cement comprises any one of portland cement, ordinary portland cement, portland slag cement, pozzolanic portland cement, portland fly ash cement or composite portland cement.
3. The high-strength high-toughness pervious cement concrete as claimed in claim 1 or 2, characterized in that the silica fume contains silica in an amount of not less than 96% by mass, has an average particle diameter of 0.05-0.2 μm, and has a specific surface area of not less than 17000m2/kg。
4. The high-strength high-toughness pervious cement concrete as claimed in claim 1 or 2, wherein said ore powder has an activity index of not less than 105% in 28 days and a specific surface area of not less than 500m2/kg。
5. The high-strength high-toughness pervious cement concrete as claimed in claim 3, wherein said mineral powder has an activity index of not less than 105% in 28 days and a specific surface area of not less than 500m2/kg。
6. The high-strength high-toughness pervious cement concrete according to any one of claims 1, 2 or 5, characterized in that the particle size of said stones is 5-8 mm; the machine-made sand belongs to medium sand, and the fineness modulus is 2.5-2.8.
7. The high-strength high-toughness pervious cement concrete as claimed in claim 3, wherein the particle size of said stones is 5-8 mm; the machine-made sand belongs to medium sand, and the fineness modulus is 2.5-2.8.
8. The high-strength high-toughness pervious cement concrete as claimed in claim 4, wherein the particle size of said stones is 5-8 mm; the machine-made sand belongs to medium sand, and the fineness modulus is 2.5-2.8.
9. The pervious cement concrete with high strength and toughness as claimed in any one of claims 1, 2, 5 or 7 to 8, wherein said ultra-short PE fibers have a diameter of 30 to 40 μm, a length of 2 to 5mm and a tensile strength of not less than 3000 MPa.
10. The high-strength high-toughness pervious cement concrete as claimed in claim 3, wherein said ultra-short cut PE fibers have a diameter of 30-40 μm, a length of 2-5 mm and a tensile strength of not less than 3000 MPa.
11. The high-strength high-toughness pervious cement concrete as claimed in claim 4, wherein said ultra-short cut PE fibers have a diameter of 30-40 μm, a length of 2-5 mm and a tensile strength of not less than 3000 MPa.
12. The high-strength high-toughness pervious cement concrete as claimed in claim 6, wherein said ultra-short cut PE fibers have a diameter of 30-40 μm, a length of 2-5 mm and a tensile strength of not less than 3000 MPa.
13. The pervious cement concrete with high strength and toughness as claimed in any one of claims 1, 2, 5, 7 to 8 or 10 to 12, wherein the calcium carbonate whiskers have a diameter of 0.5 to 2 μm, a length of 20 to 30 μm and an elastic modulus of 410 to 710 GPa.
14. The high-strength high-toughness pervious cement concrete according to claim 3, wherein said calcium carbonate whiskers have a diameter of 0.5-2 μm, a length of 20-30 μm and an elastic modulus of 410-710 GPa.
15. The high-strength high-toughness pervious cement concrete according to claim 4, wherein the calcium carbonate whiskers have a diameter of 0.5-2 μm, a length of 20-30 μm and an elastic modulus of 410-710 GPa.
16. The high-strength high-toughness pervious cement concrete according to claim 6, wherein said calcium carbonate whiskers have a diameter of 0.5-2 μm, a length of 20-30 μm and an elastic modulus of 410-710 GPa.
17. The high-strength high-toughness pervious cement concrete according to claim 9, wherein said calcium carbonate whiskers have a diameter of 0.5 to 2 μm, a length of 20 to 30 μm and an elastic modulus of 410 to 710 GPa.
18. The method for preparing the high-strength high-toughness pervious cement concrete as claimed in any one of claims 1 to 17, characterized in that the method comprises the following steps:
(1) accurately weighing raw materials in proportion;
(2) mixing and dispersing 10-20% of water, calcium carbonate whiskers and hydroxyethyl cellulose to obtain a calcium carbonate whisker dispersion suspension;
(3) mixing a water reducing agent and an inorganic gelling agent with 5-10% of water;
(4) mixing and stirring cement, silica fume and mineral powder;
(5) adding the balance water and the material obtained in the step (3) into the material obtained in the step (4) at the same time, and mixing and stirring;
(6) adding the material obtained in the step (2) into the material obtained in the step (5), and mixing and stirring;
(7) adding the ultra-short PE fibers into the material obtained in the step (6), and mixing and stirring;
(8) adding a defoaming agent into the material obtained in the step (7), and mixing and stirring;
(9) adding the machine-made sand into the material obtained in the step (8), and mixing and stirring;
(10) and (4) adding stones into the material obtained in the step (9), and uniformly mixing the stones with the material to obtain the high-strength high-toughness pervious cement concrete.
19. A building component comprising a high strength, high toughness pervious cement concrete as claimed in any one of claims 1 to 17.
20. Use of the high strength and high toughness pervious cement concrete as claimed in any one of claims 1 to 17 or the preparation method as claimed in claim 18 in the construction field.
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| NL2028099B1 (en)* | 2021-04-29 | 2022-11-10 | Univ Jiangnan | Green High-performance Fiber Reinforced Alkali-activated Composite Material and Preparation Method Thereof |
| CN115180900B (en)* | 2022-07-08 | 2023-03-28 | 江苏省科佳工程设计有限公司 | Ultrahigh-performance premixed pervious concrete and preparation method thereof |
| CN115028415B (en)* | 2022-07-08 | 2023-03-17 | 江苏省科佳工程设计有限公司 | High-strength premixed pervious concrete and preparation method thereof |
| CN115893956B (en)* | 2023-01-03 | 2024-09-20 | 湘潭大学 | Environment-friendly light high-strength pervious concrete and preparation method thereof |
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