A kind of low viscosity upper flow regime strength cement-based grouting materialTechnical field
The invention belongs to building material technology application field, and in particular to a kind of low viscosity upper flow regime strength cement-based grouting material,Such grouting material belongs to I type strength cement-based grouting material, has the advantages that low viscosity, upper flow regime, high intensity, high-durability.
Background technology
Strength cement-based grouting material is a kind of widely used material, is mainly used in the lower margin spiral shell of large scale equipment and precision equipmentThe strengthening reconstruction of the anchoring of bolt, the steel construction perfusion, the back-grouting of Equipment Foundations and various building affixed with basis.WithThe construction of China's nuclear power, water power, wind-powered electricity generation etc. heavy construction, introduce a large amount of foreign countries' sophisticated equipments, and these equipment setMeter side and manufacturer can all require to use the grouting material with low viscosity upper flow regime, it is necessary to the flowing with flow cone method to grouting materialProperty tested, low viscous grouting material keep high fluidity under the premise of can also keep the homogeneity of itself, not bleeding,Do not settle, high-order funnel can not needed just to pour into small space in the case where viscosity is relatively low, improve construction technologyAnd accelerating construction progress.
For convenience of the national reference U.S. grouting material test stone ASTMC939 of engineer applied《Prepackaged concrete grouting materialSlump test method（Flow cone method）》, in existing standard GB50448-2008《Cement-based grouting material application technology specification》BaseOn plinth, the grouting material new standard GB50448-2015 of compound China's national situation has been worked out《Cement-based grouting material application technology is advisedModel》, product standard and corresponding method of detection clearly are made that to I type grouting material in specification, it is that engineer applied detection and construction are carriedFoundation and standard are supplied.
Standard of the I type grouting material in GB50448-2015 and GB50448-2008 is as follows：
The content of the invention
For existing grouting material in high fluidity（Tangent-cone method）In the case of often have viscosity higher and water-retaining property, flow cone streamDynamic technical characterstic of the degree commonly greater than 35 seconds, the invention provides being widely used in large-scale construction project nuclear power, water power, wind-powered electricity generation etc.The low viscosity strength cement-based grouting material that Equipment Foundations are fixed, meets GB50448-2015《Cement-based grouting material application technology specification》In I type grouting material standard.
Present invention solves the technical problem that using following scheme：：
The present invention is prepared from by the component of following ratio of weight and number：
40 ~ 50 parts of ordinary cement,
5 ~ 10 parts of alumina cement,
5 ~ 8 parts of microballon,
3 ~ 5 parts of silicon ash,
4 ~ 6 parts of swelling agent,
35 ~ 45 parts of quartz sand,
1 ~ 2 part of water reducer,
0.5 ~ 1.5 part of retarder,
0.1 ~ 0.3 part of water-loss reducer,
0.2 ~ 0.4 part of early strength agent,
0.2 ~ 0.3 part of plastic expansion agent,
0.1 ~ 0.3 part of redispersable latex powder,
0.1 ~ 0.3 part of defoamer,
0.1 ~ 0.2 part of fiber.
The ordinary cement is P.O42.5 Portland cements.
The alumina cement is CA-50 aluminate cements, presetting period >=30min, final setting time≤6h.
The microballon is average grain diameter≤1.2mm.Microballon used of the invention is given birth to for Beijing Zheng Yuan Yi Qing scientific ＆ trading Co., Ltd.sThe fine microballons of MS1250 of product
The silicon ash is 95 grades of original state SILICA FUMEs, specific surface area >=18m3/kg, 150 ~ 200kg/m3 of apparent density, average grain diameter0.1~0.2μm。
The swelling agent be one kind in calcium sulphoaluminate class swelling agent, oxidation magnesium types swelling agent, lime swelling agent orMore than one mixture
The quartz sand is siliceous quartz sand, as follows according to percentage by weight ratio：
20 ~ 40 mesh 20%,
40 ~ 70 mesh 60%,
70 ~ 100 mesh 20%.
The water reducer is polycarboxylic acids powder water reducer.
The retarder is in tartaric acid, sodium tartrate, sodium gluconate, urea, borax, calcium nitrate, calgonOne or more mixtures.
The water-loss reducer is hydroxypropyl methyl cellulose, and viscosity is≤100000Pa .s.
The early strength agent is one or more the mixture in sodium sulphate, calcium formate, lithium sulfate, lithium carbonate.
The plastic expansion agent is the yellow powder plastic expansion agent of Beijing Rong Tai letters Science and Technology Ltd. production.
The redispersable latex powder is one or more in vinyl acetate ethylene copolymer, acrylic copolymer.
The defoamer is organic silicon defoamer.
The fiber is that length is the polypropylene fibre of 3 ~ 6mm.
Low viscosity upper flow regime strength cement-based grouting material of the invention when in use, adds the 15% of grouting material weight mixing water,Equipment Foundations are poured into by after stirring to use.
The I type grouting material that the present invention is developed on the basis of this standard model, performance indications are as follows：Flow cone fluidity is initialValue≤35s, 30 minutes fluidity≤50s, 3h vertical expansion ratios 0.1% ~ 3.5%, the difference 0.02% of the swell value of 3h and 24h ~0.50%, compression strength 1d >=15MPa, 3d >=30MPa, 28d >=50MPa, chloride ion content ＜ 0.1%, bleeding rate is 0.
The positive effect of the present invention is as follows：
Using ordinary cement and the composite effect of alumina cement in technology path of the invention, it is ensured that the early strength of grouting materialAnd later strength, using the double-doped of common swelling agent and plastic expansion agent, solve grouting material 3h and 24 hours vertical expansion ratiosProblem, microballon particle diameter is micro- in the composite granule of the three components compounding of cement, microballon and silica flour between cement and silicon ashThe interparticle hole of pearl filling concrete, silica flour fills the interparticle hole of microballon again, obtains the powder of dense packing effect, microballon and siliconAsh be with continuous ionic exchange it is ultra-fine, with full chondritic, surface is globular glass body, and particle diameter is superfine, with fabulousFilling and ball lubricating effect, ternary system cause grouting material water film thickness increase, increase bulk density, be released from byWater, so as to reduce system viscosity, improves grouting material flow cone speed.Other are auxiliary for retarder, early strength agent, water-loss reducer, fiber etc. simultaneouslyHelp the addition of material so that under the premise of service behaviour is ensured, other indexs such as mechanical property and endurance quality are obtained grouting materialMeet.
The low viscosity upper flow regime strength cement-based grouting material that the present invention is provided, uses 0.13 ~ 0.15 ratio of water to material, by water during constructionSequentially added with grouting material and stirred, grouting material meets GB50448-2015《Cement-based grouting material application technology specification》InThe standard regulation of I type grouting material.
Low viscosity upper flow regime strength cement-based grouting material of the invention viscosity lazy flow in practical application is high, can save a high positionThe use of funnel can pour into small space.
Specific embodiment
The present invention is described further with reference to specific embodiment, but is not used in limitation the scope of the present invention.
Embodiment 1：
The ratio of weight and number of each group is as follows：
40 parts of P.O42.5 cement,
5 parts of CA-50 alumina cements,
8 parts of MS1250 microballons,
5 parts of original state silicon ash,
4 parts of sulphoaluminate expander,
20 ~ 100 45 parts of mesh quartz sands,
1 part of polycarboxylate water-reducer,
1 part of sodium gluconate,
0.5 part of tartaric acid,
0.1 part of hydroxypropyl methyl cellulose,
0.1 part of calcium formate,
0.1 part of lithium carbonate,
0.3 part of plastic expansion agent,
0.3 part of redispersable latex powder,
0.1 part of defoamer,
0.1 part of polypropylene fibre.
Experimental technique is as follows：
The grouting material for preparing 1.8kg is weighed by above-mentioned number, 270g mixing waters are added, is stirred using planetary cement mortarMachine is stirred, and stirs 240s by auto-programming, and grouting material performance test is then carried out under 20 DEG C of ambient temperature conditions.
The grouting material performance tested by aforementioned test methods is as follows：
Flowing cone initial flow degree is 29s, 30min fluidities 45s, 3h vertical expansion ratio 1.3%, the swell value of 3h and 24h0.04%, 1d compression strength 22MPa, 3d compression strength 42MPa, 28d compression strength 75MPa, the % of chloride ion content 0.04 are differed from, is secretedWater rate is 0.
Embodiment 2：
The ratio of weight and number of each group is as follows：
45 parts of P.O42.5 cement,
10 parts of CA-50 alumina cements,
5 parts of MS1250 microballons,
3 parts of original state silicon ash,
3 parts of MgO expansion agent,
1 part of sulphoaluminate expander
20 ~ 100 35 parts of mesh quartz sands,
2 parts of polycarboxylate water-reducer,
0.25 part of borax,
0.5 part of urea,
0.3 part of hydroxypropyl methyl cellulose,
0.2 part of lithium sulfate,
0.2 part of sodium sulphate
0.3 part of plastic expansion agent,
0.2 part of redispersable latex powder,
0.3 part of defoamer,
0.1 part of polypropylene fibre.
Experimental technique is as follows：
The grouting material for preparing 1.8kg is weighed by above-mentioned number, 270g mixing waters are added, is stirred using planetary cement mortarMachine is stirred, and stirs 240s by auto-programming, and grouting material performance test is then carried out under 20 DEG C of ambient temperature conditions
The grouting material performance tested by aforementioned test methods is as follows
Flowing cone initial flow degree is 32s, 30min fluidities 47s, 3h vertical expansion ratio 1.2%, the swell value of 3h and 24h0.05%, 1d compression strength 26MPa, 3d compression strength 47MPa, 28d compression strength 82MPa, the % of chloride ion content 0.03 are differed from, is secretedWater rate is 0.
Embodiment 3：
The ratio of weight and number of each group is as follows：
40 parts of P.O42.5 cement,
7 parts of CA-50 alumina cements,
6 parts of MS1250 microballons,
7 parts of original state silicon ash,
6 parts of lime swelling agent,
20 ~ 100 40 parts of mesh quartz sands,
1.5 parts of polycarboxylate water-reducer,
0.5 part of sodium tartrate,
0.5 part of calgon
0.5 part of sodium gluconate
0.2 part of hydroxypropyl methyl cellulose,
0.1 part of calcium formate,
0.2 part of lithium sulfate
0.25 part of plastic expansion agent,
0.3 part of redispersable latex powder,
0.2 part of defoamer,
0.15 part of polypropylene fibre.
Experimental technique is as follows：The grouting material for preparing 1.8kg is weighed by above-mentioned number, 270g mixing waters are added, usedPlanetary cement mortar mixer stirring, and 240s is stirred by auto-programming, then filled under 20 DEG C of ambient temperature conditionsSize performance is tested
The grouting material performance tested by aforementioned test methods is as follows
1st, flowing cone initial flow degree is 32s, 30min fluidities 41s, 3h vertical expansion ratio 1.1%, the swell value of 3h and 24h0.08%, 1d compression strength 24MPa, 3d compression strength 45MPa, 28d compression strength 78MPa, the % of chloride ion content 0.06 are only differed from,Bleeding rate is 0.
Embodiment 4：
The ratio of weight and number of each group is as follows：
50 parts of P.O42.5 cement,
10 parts of CA-50 alumina cements,
5 parts of MS1250 microballons,
5 parts of original state silicon ash,
4 parts of sulphoaluminate expander,
2 parts of MgO expansion agent
20 ~ 100 40 parts of mesh quartz sands,
2 parts of polycarboxylate water-reducer,
1 part of tartaric acid,
0.5 part of calcium nitrate,
0.3 part of hydroxypropyl methyl cellulose,
0.3 part of lithium sulfate,
0.2 part of plastic expansion agent,
0.1 part of redispersable latex powder,
0.3 part of defoamer,
0.1 part of polypropylene fibre fiber.
Experimental technique is as follows：
The grouting material for preparing 1.8kg is weighed by above-mentioned number, 270g mixing waters are added, is stirred using planetary cement mortarMachine is stirred, and stirs 240s by auto-programming, and grouting material performance test is then carried out under 20 DEG C of ambient temperature conditions
The grouting material performance tested by aforementioned test methods is as follows：
Flowing cone initial flow degree is 33s, 30min fluidities 48s, 3h vertical expansion ratio 1.0%, the swell value of 3h and 24h0.04%, 1d compression strength 28MPa, 3d compression strength 41MPa, 28d compression strength 74MPa, the % of chloride ion content 0.03 are differed from, is secretedWater rate is 0.
Above the present invention is described in detail with a general description of the specific embodiments, but in the present inventionOn the basis of, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore, notDeviate these modifications or improvements on the basis of present invention spirit, belong to the scope of protection of present invention.