CN102399073A - Formula and preparation process for dry-mixed mortar - Google Patents

Abstract

The invention discloses a formula and a preparation process for dry-mixed mortar, and belongs to the technical field of building materials. The formula for the dry-mixed mortar comprises the following components in percentage by mass: 77-81 percent of yellow sand, 9-19.5 percent of cement, 1.2-2 percent of thickening powder and 2-10.2 percent of fly ash. In the preparation process for the dry-mixed mortar, the dry-mixed mortar comprises the yellow sand, the cement, the thickening powder and the fly ash; the components are proportioned according to different classes and different types of the dry-mixed mortar; and the components are electrically programmed, processed by a mixer, stirred and bagged. The dry-mixed mortar exceeds the domestic similar products in the aspects of shrinkage resistance, crack resistance, freezing and thawing resistance, strength and the like; phenomena of burst, fall, crack, aberration and the like existing in the conventional mortar are solved better; environmental pollution can also be reduced; engineering quality is guaranteed; civilized construction is realized; and the dry-mixed mortar is widely used for building industry and civil decoration market.

Description

The prescription of dry-mixed mortar and preparation technology

[technical field]

The present invention relates to a kind of dry-mixed mortar, belong to building material technical field, refer more particularly to a kind of prescription and preparation technology of dry-mixed mortar.

[background technology]

Along with construction quality, environmental requirement and civilized construction improve constantly with requiring, shortcoming and limitation that the system mortar is mixed in the working-yard are more and more outstanding, and dry-mixed mortar obtains more and more people's favor because of the advantage at aspects such as technical feature, social benefits.

Dry-mixed mortar, be building materials field emerging do to mix one of material, be main agglutinate with cement, the mixture that fine aggregate, mineral admixture, reinforcement material and the admixture of handling with dry screened mixes by a certain percentage.

Dry-mixed mortar be from last century the fifties European construction market develop, nowadays in country such as Germany, Austria, Finland with dry-mixed mortar as main mortar material.In the Asia; The dry-mixed mortar development on ground such as Singapore, Japan, Korea S, Hong Kong also very rapidly; From last century the nineties so far; The gesture that China's dry-mixed mortar development has become to set a prairie fire, dry-mixed mortar was promoted the use of existing 6 years in the area, Guangzhou, was dry-mixed mortar as surpassing three one-tenth in the building field motar of Hong Kong.Corresponding guilding policy and standard are progressively implemented, and the provincial standard of the utilisation technology rules of Beijing, the relevant dry-mixed mortar in Shanghai City was also implemented several years, and Qingdao City, Chongqing City's provincial standard are also in formulation.

Replacing traditional mortar with the demands of social development dry-mixed mortar has been inevitable.The tradition mortar has shortcoming and the limitation that is difficult to satisfy civilized construction and does not meet environmental requirement, the concrete elaboration as follows:

At first; The storage space of the various starting material (comprising cement, sand, lime putty etc.) of tradition mortar not only can impact surrounding environment, mixes at mortar and also can form more airborne dust in the system process; Like relevant data presentation; It is about 22% that the construction airborne dust in city, Guangzhou accounts for the city dust discharge amount, and cement uses and relevant total dust discharge amount to account for city construction airborne dust total amount about 35%, therefore; Dust discharge amount in the cement use is the main pollution source of construction airborne dust, does not meet environmental requirement.

Secondly, the whipping device of job mix mortar often noise exceeds standard mostly, and noise disturbs residents and also becomes city one overall situation problem.Raising along with social progress and people's living standard; Environmental problem has become the focus that various circles of society pay close attention to, and the above-mentioned all environmental problems that occur had at the construction field (site) both been hindered city image; The also routine work of affect people's and life, extremely inharmonious with the progress in epoch.

The tradition mortar also has and is difficult to guarantee construction quality, can not adapt to the shortcoming of novel wall material.As follows:

At first, like the inaccurate unusual fluctuations that cause the mortar quality because of metering, the job mix mortar does not often have strict metering, estimates with the workman is on-the-spot entirely, can not strictly carry out proportioning; Can't accurately add the admixture of trace; Can not accurately control amount of water; The uniformity coefficient that stirs is difficult to control, and raw-material quality fluctuation is big in addition, all has than big-difference like river, different seedbed sand silt content and grating, and the unusual fluctuations that quality appears in the mortar of mixing system with this understanding are inevitable.

Secondly, job mix mortar workability is poor, and because of existing sand cutting slurry can't or seldom add admixture, workability is poor, is difficult to carry out mechanical execution, and operation is wasted time and energy, and the many wastes of the ash that falls are big, and quality accident is many, ftracture like motar peel off, waterproof mortar seepage etc.

Moreover; Existing sand cutting slurry kind is single; Can't satisfy the demands of different of various building materials to mortar; The novel wall material concrete hollow block that encourage to use like country, air-entrained concrete building block, Dinas brickes, ceramsite concrete hollow block, flyash brick etc., and existing sand cutting slurry is exactly limited several proportionings such as sand-cement slurry, cement lime mortar for a long time, can not adapt to the request for utilization of novel wall material far away.

Dry-mixed mortar is compared with traditional mortar, has the quality of production of assurance, the complete advantage that satisfies various different engine requests of product category.

At first; Dry-mixed mortar is according to product category and performance requriements; The particular design proportioning is also added multiple admixture and is carried out modification, like admixture commonly used ether of cellulose, redispersable latex powder, thixotroping lubricant, skimmer, air entrapment agent, setting accelerator, hydrophober etc. is arranged.The mortar of modification has excellent workability and quality, and good workability is conveniently built by laying bricks or stones, plastered and pumping, improves operating efficiency, like the manual plaster 10m that plasters²/ h, mechanical execution 40m²/ h; Once spreading slurry length when building by laying bricks or stones increases greatly.Because its excellent workability and quality improve construction quality, construction layer thickness reduces, economical with materials.The chance that the raising of construction quality makes maintenance do over again significantly reduces, and also can reduce the long-time maintenance expense of buildings simultaneously.

Secondly; Dry-mixed mortar manufacturing enterprise can be according to different body materials and functional requirement component design, as building by laying bricks or stones and motar to the high-moisture-retention of materials for wall designs such as the bigger air-entrained concrete building block of various water-intake rates, Dinas brickes, ceramsite concrete hollow block, flyash brick; Be used for the gravity flow level land platform mortar of ground requirement high-flatness etc.Also can satisfy multiple functional requirement, like insulation, impervious, grouting, repairing, decoration etc.

In order to cooperate practicing of novel wall effectively, novel dry-mixed mortar arises at the historic moment, in the dry-mixed mortar; The material of high-quality environmental protection has obvious social; The one of which dry-mixed mortar is the premixing material, need only stir and can use at building site Jia Shui, and airborne dust is few; More environmental protection, and favourable workman is healthy.Its two construction quality is excellent, has greatly increased contractor and numerous owners' confidence, and the seepage of the existing sand cutting slurry of tradition waterproof layer also is puzzlement owner's comparison distinct issues, and the water-proof material of multifrequency nature will fundamentally solve this type of problem in the dry-mixed mortar.Its three because of its excellent operation can, labor strength is low, speed of application is fast.

Though dry-mixed mortar day by day becomes the main flow trend in market, because dry-mixed mortar also is just to popularize in recent years, prescription and production technique are all not mature enough; Dry-mixed mortar all is to adopt tap water owing to the scene adds the water stirring; Water temperature is usually at 15～20 ℃, a lot of high molecular polymers at normal temperatures, the cold cut film-forming properties is all very poor; The very easily performance of influencing characteristic; Through selection contrast experiment repeatedly, external imported materials and items can solve cold cut property and film formation at low temp property preferably, and it is material modified to add difference according to the desired characteristic of different dry-mixed mortars.The dispersion of uniform mixing and Gao Mo spandex fiber is to produce key in process of production; Because the various density of material of dry-mixed mortar are different with proportional quantity; Add that high modulus fiber is very easily agglomerating in dry powder, be difficult for disperseing, so all very important from technology, equipment and additive agent modified material in process of production; Conventional production process and equipment are difficult to reach standard-required, often produce explosion, come off, problem such as cracking, aberration.

My company is through research for many years, and proportioning, test repeatedly provides a kind of dry-mixed mortar prescription and preparation technology; Stop problem of environmental pollution, alleviated labour intensity, reduced airborne dust and noise; Realize civilized construction, produced good economic benefit and social benefit.

[summary of the invention]

The object of the present invention is to provide that a kind of anti-contraction, freedom from cracking, freeze-thaw-, cohesive force are strong, the dry-mixed mortar prescription of water conservation, solve traditional mortar explosion, come off, problems such as cracking, aberration.

Another purpose of the present invention is to provide a kind of dry-mixed mortar preparation technology, reform prior art for preparing pattern, and Calcified pond and the stirrer that build by laying bricks or stones the cancellation working-yard reduce labor intensity, and reduce building cost, guarantee construction quality, realize civilized construction.

For achieving the above object, the present invention adopts following technical scheme:

The prescription of dry-mixed mortar comprises component yellow ground, cement, densification powder, flyash, and the quality proportioning of each component is following:yellow ground 77～81%,cement 9～19.5%, densification powder 1.2～2%,flyash 2～10.2%.

Described yellow ground is a kind of oven dry goods, and through screening, product fineness is through the 5mm square hole sieve.

Described cement is 42.5 class g cements, a kind of silicate complex cement.

The components by weight percent and the proportioning of described densification powder consist of: wilkinite 59～80%, flyash 19～40%, methylcellulose gum 0.06～0.1%, redispersable latex powder 0.06～0.1%, Z 150PH 0.6～1%.

Described flyash is the II level.

A kind of preparation technology of dry-mixed mortar; This dry-mixed mortar component is yellow ground, cement, densification powder, flyash; Different grades, different model according to dry-mixed mortar are carried out proportioning to dry-mixed mortar, get into that electricity is program control, mixing machine, stirring, packed, may further comprise the steps:

(1), prepare the oven dry yellow ground, and through screening, dedusting, control yellow ground water cut (requiring≤0.5%), silt content (requiring≤0.5%), product fineness is through the 5mm square hole sieve;

(2), prepare densification powder, comprise component wilkinite, flyash, methylcellulose gum, redispersable latex powder, Z 150PH;

(3), raw materials weighing, press 4m³Each component concentration takes by weighing raw material in the finished product;

(4), at twice mix,, get into mixing machine again and stir, guarantee that each mixing of materials is even at first through electric program-controlled equipment mixed powder;

(5), metering packing.

In the above-mentioned mixing step, the raw materials mix time through electric program-controlled equipment is 1.5 minutes first, and the raw materials mix time through mixing machine is 5 minutes once more.

The present invention is through optimizing each set of dispense ratio in the dry-mixed mortar; Acquisition has that anti-contraction, freedom from cracking, freeze-thaw-, water conservation, cohesive force are strong, the dry-mixed mortar of steady performance: the water that adds dry-mixedmortar usage quantity 10%～15% stirs into thick pulpous state, stirs and can come into operation in back 5 minutes.The present invention makes product strength at DM7.5～DM30 and DP5.0 (JG/T230-2007 " premixing mortar "), 3～8 hours time of coagulation, water-retentivity >=88%; And superior performance; Meet the requirement of building environmental protection new development, suitable industry is applied, and guarantees construction quality.

Owing to adopted above technical scheme, compared with prior art, the present invention has following beneficial effect:

(1), the anti-contraction, freeze-thaw-: Z 150PH has good tensile strength and oxygen barrier performance in this formula for a product component densification powder, can reduce the dry-mixed mortar surface tension, plays anti-contraction;

(2), freedom from cracking: Z 150PH has the good adhesion of making film property, excellence, can strengthen the stability and the cohesive force of dry-mixed mortar;

(3), water conservation: the methylcellulose gum in the densification powder has excellent wetting capacity, water-retentivity, thickening property and film-forming properties;

(4), cohesive force is strong: Z 150PH also has unique powerful cementability, and wilkinite also has good cohesiveness and plasticity-in the densification powder, all can strengthen the stability and the cohesive force of dry-mixed mortar;

(5), ensure the quality of products: fixed place is arranged, and perfect computer control system, accurate computer control metering, the quality inspection of standard strictness, perfect quality control system fully guarantee quality product.

[description of drawings]

Figure is dry-mixed mortar weight percentages of components and strength grade corresponding relation synoptic diagram.

[embodiment]

Embodiment 1: the prescription of dry-mixed mortar and preparation technology thereof, and its composition weight proportioning precentagewise is designated as:yellow ground 79%,cement 9%, densification powder 1.8%, flyash 10.2%; During making, prepare the oven dry yellow ground, and through screening, dedusting, control yellow ground water cut (requiring≤0.5%), silt content (requiring≤0.5%), product fineness are through the 5mm square hole sieve; Prepare densification powder, comprise component wilkinite, flyash, methylcellulose gum, redispersable latex powder, Z 150PH; Prepare burden yellow ground, cement, densification powder, flyash by foregoing weight percent; Mix at twice, at first through electric program-controlled equipment mixing raw material, mixing time is 1.5 minutes, gets into mixing machine again and stirs, and mixing time is 5 minutes.The products obtained therefrom strength grade is DM7.5.

Embodiment 2: the prescription of dry-mixed mortar and preparation technology thereof, and its composition weight proportioning precentagewise is designated as:yellow ground 78%, cement 11.5%, densification powder 1.6%, flyash 8.9%; During making, prepare the oven dry yellow ground, and through screening, dedusting, control yellow ground water cut (requiring≤0.5%), silt content (requiring≤0.5%), product fineness are through the 5mm square hole sieve; Prepare densification powder, comprise component wilkinite, flyash, methylcellulose gum, redispersable latex powder, Z 150PH; Prepare burden yellow ground, cement, densification powder, flyash by foregoing weight percent; Mix at twice, at first through electric program-controlled equipment mixing raw material, mixing time is 1.5 minutes, gets into mixing machine again and stirs, and mixing time is 5 minutes.The products obtained therefrom strength grade is DM10.

Embodiment 3: the prescription of dry-mixed mortar and preparation technology thereof, and its composition weight proportioning precentagewise is designated as:yellow ground 77%, cement 14%, densification powder 1.5%, flyash 7.5%; During making, prepare the oven dry yellow ground, and through screening, dedusting, control yellow ground water cut (requiring≤0.5%), silt content (requiring≤0.5%), product fineness are through the 5mm square hole sieve; Prepare densification powder, comprise component wilkinite, flyash, methylcellulose gum, redispersable latex powder, Z 150PH; Prepare burden yellow ground, cement, densification powder, flyash by foregoing weight percent; Mix at twice, at first through electric program-controlled equipment mixing raw material, mixing time is 1.5 minutes, gets into mixing machine again and stirs, and mixing time is 5 minutes.The products obtained therefrom strength grade is DM15.

Embodiment 4: the prescription of dry-mixed mortar and preparation technology thereof, and its composition weight proportioning precentagewise is designated as:yellow ground 77%, cement 17%, densification powder 1.2%, flyash 4.8%; During making, prepare the oven dry yellow ground, and through screening, dedusting, control yellow ground water cut (requiring≤0.5%), silt content (requiring≤0.5%), product fineness are through the 5mm square hole sieve; Prepare densification powder, comprise component wilkinite, flyash, methylcellulose gum, redispersable latex powder, Z 150PH; Prepare burden yellow ground, cement, densification powder, flyash by foregoing weight percent; Mix at twice, at first through electric program-controlled equipment mixing raw material, mixing time is 1.5 minutes, gets into mixing machine again and stirs, and mixing time is 5 minutes.The products obtained therefrom strength grade is DM20.

Embodiment 6: the prescription of dry-mixed mortar and preparation technology thereof, and its composition weight proportioning precentagewise is designated as:yellow ground 77%, cement 18.5%, densification powder 1.7%, flyash 2.8%; During making, prepare the oven dry yellow ground, and through screening, dedusting, control yellow ground water cut (requiring≤0.5%), silt content (requiring≤0.5%), product fineness are through the 5mm square hole sieve; Prepare densification powder, comprise component wilkinite, flyash, methylcellulose gum, redispersable latex powder, Z 150PH; Prepare burden yellow ground, cement, densification powder, flyash by foregoing weight percent; Mix at twice, at first through electric program-controlled equipment mixing raw material, mixing time is 1.5 minutes, gets into mixing machine again and stirs, and mixing time is 5 minutes.The products obtained therefrom strength grade is DM30.

Embodiment 7: the prescription of dry-mixed mortar and preparation technology thereof, and its composition weight proportioning precentagewise is designated as:yellow ground 81%,cement 9%,densification powder 2%,flyash 8%; During making, prepare the oven dry yellow ground, and through screening, dedusting, control yellow ground water cut (requiring≤0.5%), silt content (requiring≤0.5%), product fineness are through the 5mm square hole sieve; Prepare densification powder, comprise component wilkinite, flyash, methylcellulose gum, redispersable latex powder, Z 150PH; Prepare burden yellow ground, cement, densification powder, flyash by foregoing weight percent; Mix at twice, at first through electric program-controlled equipment mixing raw material, mixing time is 1.5 minutes, gets into mixing machine again and stirs, and mixing time is 5 minutes.The products obtained therefrom strength grade is DP5.0.

Claims (7)

1. the prescription of dry-mixed mortar, it is characterized in that: dry-mixed mortar comprises component yellow ground, cement, densification powder, flyash, the mass percent of each component is: yellow ground 77～81%, cement 9～19.5%, densification powder 1.2～2%, flyash 2～10.2%.

2. in the prescription of dry-mixed mortar according to claim 1, it is characterized in that: described yellow ground is a kind of oven dry goods, and through screening, product fineness is through the 5mm square hole sieve.

3. in the prescription of dry-mixed mortar according to claim 1, it is characterized in that: described cement is 42.5 class g cements, is a kind of silicate complex cement.

4. in the prescription of dry-mixed mortar according to claim 1, it is characterized in that: the components by weight percent and the proportioning of described densification powder consist of: wilkinite 59～80%, flyash 19～40%, methylcellulose gum 0.06～0.1%, redispersable latex powder 0.06～0.1%, Z 150PH 0.6～1%.

5. in the prescription of dry-mixed mortar according to claim 1, it is characterized in that: described flyash is the II level.

6. the preparation technology of a dry-mixed mortar; This dry-mixed mortar comprises component yellow ground, cement, densification powder, flyash, and according to the different grades of dry-mixed mortar, different model is carried out proportioning; Get into that electricity is program control, mixing machine, stirring, packed, it is characterized in that: may further comprise the steps:

(1), prepare the oven dry yellow ground, and through screening, dedusting, control yellow ground water cut (requiring≤0.5%), silt content (requiring≤0.5%), product fineness is through the 5mm square hole sieve;

(2), prepare densification powder, comprise component wilkinite, flyash, methylcellulose gum, redispersable latex powder, Z 150PH;

(3), raw materials weighing, press 4m³Each component concentration takes by weighing raw material in the finished product;

(4), at twice mix,, get into mixing machine again and stir, guarantee that each mixing of materials is even at first through electric program-controlled equipment mixed powder;

(5), metering packing.

7. the preparation technology of a kind of dry-mixed mortar according to claim 6, it is characterized in that: the raw materials mix time through electric program-controlled equipment is 1.5 minutes first, the raw materials mix time through mixing machine is 5 minutes once more.

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