CN102276205B - Swelling crack resistant mortar - Google Patents

Abstract

The invention relates to a swelling crack resistant mortar which comprises, by weight, 30 parts of cement, 90 parts of sand with fineness modulus of 2.6 to 2.8, 0.7 part of CaO, 0.3 part of MgO, 1.7 parts of rubber powder, 0.05 part of methyl cellulose, 0.1 part of PP fiber with a length of 3 to 5 mm, 7.15 parts of an admixture, 0.1 part of nanometer silica dispersion liquid in which surface of silica is modified by amphiphilic block polyether silanol and the monodisperse average particle size of the silica particles is 10 to 50 nm, and water, wherein, the weight ratio of water to the rest components is 0.2-0.25:1. The swelling crack resistant mortar provided in the invention has good crack resistance, endurance and resistance to impact, shock and fires.

Description

The expansion anticracking grout

Technical field

The invention belongs to civil engineering material technical field, be specifically related to a kind of expansion anticracking grout.

Background technology

Mortar is mixed and stirred in proportion by inorganic coagulation material and fine aggregate and water and forms, and also claims mortar.Be used to build by laying bricks or stones and plastering engineering, can be divided into masonry mortar and plastering mortar, the former is used for building by laying bricks or stones of brick, stone, building block etc. and member is installed; The latter then is used for plastering of surfaces such as metope, ground, roofing and post and beam construction, to reach requirements such as protection and decoration.Also have plenty of in the ordinary mortar material and add water with gypsum, lime putty or clay adding of fiber strongthener and be mixed with paste, be called ash, cream, mud or clay.Commonly used has hemp-fibred plaster (mixing the lime putty of hemp cut), paper strip mixed lime mortar (mixing the lime putty of paper muscle), gypsum ash (mixing lime putty and paper muscle or glass fibre etc. in the plaster of Paris) and mixes plaster (mixing a small amount of lime and wheat straw or straw in the clay).

According to composition material, ordinary mortar also can be divided into: 1. lime mortar.Make according to a certain ratio by lime putty, Sha Heshui, generally be used for requirement of strength is not high, be not subjected to humidity masonry and coat of plaster; 2. sand-cement slurry.Make according to a certain ratio by cement, Sha Heshui, generally be used for masonry, metope or the ground etc. of wet environment or water; 3. mixed mortar.The suitable adulterant of admixture such as flyash, diatomite etc. are made in cement or lime mortar, saving cement or lime consumption, and improve the workability of mortar.Mixed mortar commonly used has cement lime mortar, cement clay mortar and lime clay mortar etc.

But existing mortar is difficult to have the over-all properties of cracking resistance, weather resistance, shock resistance, antidetonation and anti-fire preferably.

Summary of the invention

The object of the present invention is to provide a kind of expansion anticracking grout, described expansion anticracking grout has the ability of cracking resistance, weather resistance, shock resistance, antidetonation and anti-fire preferably.

For achieving the above object, technical scheme provided by the invention is: a kind of expansion anticracking grout, count by weight, by 30 parts of cement, the sand of 90 parts of fineness modulus 2.6～2.8,0.7 part CaO, 0.3 part MgO, 1.7 part rubber powder, 0.05 part methylcellulose gum (MC), 0.1 part 3～5mm PP fiber, 7.15 part adulterant is (as flyash, slag, coal gangue or stone flour), 0.1 it is that nano silicon dispersion liquid and the water of 10～50nm is made that part finishing has amphipathic block polyether silanol and the monodispersed median size of particle, wherein the consumption weight ratio (being ratio of water to material) of water and other material (other material is meant above-mentioned other raw material sums outward that dewater) is 0.2～0.25:1.

It is that the nano silicon dispersion liquid (method according to the patent No. 200510018972.4 makes) of 10-50nm is made by laxative remedy that described finishing has amphipathic block polyether silanol and the monodispersed median size of particle: after filtering out impurities with water glass, in the presence of amphiphilic block polyether silicon alcohol compound, do cationic exchange through polystyrol cation exchange resin, again after the anionic polystyrene exchange resin carries out anionresin, add NaOH solution, regulate the pH value, after leaving standstill, heating, be cooled to room temperature again, obtaining finishing by the ultrafiltration membrane ultrafiltration and concentration, amphipathic block polyether silanol and the monodispersed median size of particle are arranged is the nano silicon dispersion liquid of 10-50nm.

The present invention's anticracking grout that expands has the ability of cracking resistance, weather resistance and shock resistance, antidetonation and anti-fire preferably.

Concrete embodiment

Embodiment 1: the expansion anticracking grout is by 30 parts of cement, the sand of 90 parts of fineness modulus 2.7,0.7 part CaO, 0.3 part MgO, 1.7 part rubber powder (redispersable latex powder, treasured occasion company product), 0.05 part MC(methylcellulose gum), 0.1 part 3～5mm PP fiber (the strong engineering materials in Tai'an road company limited product), 7.15 part flyash (secondary), 0.1 it is that nano silicon dispersion liquid (200510018972.4 embodiment 1 make by the patent No.) and the water of 50nm is mixed and made into that part finishing has amphipathic block polyether silanol and the monodispersed median size of particle, the consumption of water is 0.2 times (weight multiple) of other raw material summation.After wherein the nano silicon dispersion liquid mixes with water earlier, mix with leftover materials again and promptly get the anticracking grout that expands.

Comparative example 1: be mixed and made into by the sand of 30 parts of cement, 90 parts of fineness modulus 2.7,0.7 part of CaO, 0.3 part of MgO, 1.7 parts of rubber powders, 0.05 part of MC, 0.1 part of 3～5mm PP fiber (the strong engineering materials in Tai'an road company limited product), 7.15 parts of flyash (secondary) and water, the consumption of water is 0.4 times of cement consumption.

The following testing data of the present invention detects according to JG/T230-2007 standard and ordinary method.

Table 1 mortar test-results

The present invention compares with the technical scheme of comparative example 1 as can be seen from Table 1, and the present invention not only has the fundamental property of premixing mortar, and has better effect at aspects such as ultimate compression strength, cohesive strength, expansion character, water-retentivitys; Can be used as wipe one's face, waterproof, cracking resistance, freeze proof, adhesive mortar use.

The present invention has amphipathic block polyether silanol nano silicon dispersion liquid by add CaO, MgO, rubber powder, MC, PP fiber and finishing in mortar, by finishing the effect of amphipathic block polyether silanol nano silicon dispersion liquid is arranged, make the sticking mutually netted enhanced system that distributes mutually for fine and close unrest of PP fiber and produce the effect that bonds closely with cement, strengthened consolidate the do power of body to gathering materials, thereby improved wear resisting property, help preventing and controlling the generation and the development of microfracture, increase the toughness of mortar, improve the ultimate elongation rate; Has the ability of cracking resistance, weather resistance, shock resistance, antidetonation and anti-fire preferably.

Claims (3)

1. expansion anticracking grout, count by weight, by the sand of 30 parts of cement, 90 parts of fineness modulus 2.6～2.8,0.7 part of CaO, 0.3 part of MgO, 1.7 parts of rubber powders, 0.05 part of methylcellulose gum, 0.1 part of 3～5mm PP fiber, 7.15 parts of adulterants, 0.1 part of finishing amphipathic block polyether silanol and the monodispersed median size of particle being arranged is that nano silicon dispersion liquid and the water of 10-50nm is made, and wherein the consumption weight ratio of water and other material is 0.2～0.25:1.

2. expansion anticracking grout according to claim 1, it is characterized in that: it is that the nano silicon dispersion liquid of 10-50nm is made by laxative remedy that described finishing has amphipathic block polyether silanol and the monodispersed median size of particle: after filtering out impurities with water glass, in the presence of amphiphilic block polyether silicon alcohol compound, do cationic exchange through polystyrol cation exchange resin, again after the anionic polystyrene exchange resin carries out anionresin, add NaOH solution, regulate the pH value, after leaving standstill, heating, be cooled to room temperature again, obtaining finishing by the ultrafiltration membrane ultrafiltration and concentration, amphipathic block polyether silanol and the monodispersed median size of particle are arranged is the nano silicon dispersion liquid of 10-50nm.

3. claim 1 or 2 described expansion anticracking grouts, it is characterized in that: described adulterant is selected from flyash, slag, coal gangue or stone flour.