CN100361923C - Cement mortar additive - Google Patents

Abstract

The present invention relates to a cement mortar additive which is composed of montmorillonite powders, gypsum powders, bentonite, magnesium oxide, kaolin and dispersers according to the certain weight mixture ratio. The physical mechanical performance of the mortar can be greatly improved, mixability is increased, tensile strength and bonding strength can be increased, the water retentivity and the adhesive ability of the mortar can be increased, and thereby, the purposes of the cracking resistance and the penetrating resistance of the mortar can be reached, and the problems of the constructional work cracking and the hollow swell of inner and outer wall faces and ceilings are well solved.

Description

Cement mortar additive

Technical field

The present invention relates to a kind of material of construction, particularly a kind of have a cement mortar additive that prevents metope be full of cracks, hollowing.

Background technology

Masonry, cement prefab build by laying bricks or stones and interior exterior wall, top ceiling plaster in, all to use sand-cement slurry, sand-cement slurry is mainly made by cement, lime, Sha Heshui, the ratio between them is 1: 0.6: 6: 1.8.The preparation of this sand-cement slurry not only operation loaded down with trivial details, waste time and energy, and to consume a large amount of lime, cause the cost height.Also have a lot of shortcomings during use, for example cause water reducing ability poor owing to add lime putty, time of coagulation is long; Its workability, viscosity are general, and the metope of plaster, top ceiling chap and hollowing easily, and construction is fallen ash and caused waste more; Construction inconvenience, the untimely use of mortar also can be condensed, and will often stir by hand in the construction, could use.

In order to solve the above problems, people also develop the product promotion of replace lime in succession and use through exploring for a long time.Though receive certain effect, also there are very big difference in the viscosity and the accelerated solidification time aspect that increase grout.Particularly interior wall face and top ceiling plaster cause the problem of be full of cracks and hollowing to fail all the time to solve.

Summary of the invention

The objective of the invention is to overcome the shortcoming of above-mentioned prior art and a kind of cement mortar additive that prevents metope be full of cracks, hollowing that has is provided.

Purpose of the present invention can realize by following technical measures: a kind of cement anticrack additive, be made up of montmorillonite powder, terra alba, wilkinite, magnesium oxide, kaolin, dispersion agent, its weight proportion is: 10～20 parts of montmorillonite powders, 10～20 parts of terra albas, 20～40 parts of wilkinites, 10～25 parts in magnesium oxide, 10～15 parts of kaolin, 5～10 parts of dispersion agents; Before the preparation, earlier montmorillonite powder and terra alba were calcined 2～3 hours down for 140～150 ℃ in temperature.

Its manufacture method comprises:

A, 10～20 parts of 10～20 parts of montmorillonite powders, terra alba are added in the calcining furnace, in the calcining 2～3 hours down of 140～150 ℃ of temperature;

In b, the montmorillonite powder that step a is obtained and terra alba and 20～40 parts of wilkinites, 10～25 parts in magnesium oxide, 10～15 parts of kaolin, 5～10 parts of adding reactors of dispersion agent, stirred 2～3 hours;

C, mixture crushing screening that step b is obtained and this additive.

Described dispersion agent is a tripoly phosphate sodium STPP.

Described dispersion agent also can be anion surfactant.

Above-mentioned wilkinite is an organobentonite.

Above-mentioned magnesium oxide is light calcined magnesia.

The wilkinite of cement anticrack additive of the present invention can guarantee the sand-cement slurry stable performance as the suspension and the tackifier of sand-cement slurry, has soft swelling property and water-retentivity simultaneously, makes mortar become soft plastic, high resilience; Magnesium oxide, terra alba strengthen mortar agglomerative intensity; Montmorillonite powder quickens the setting time of mortar; Terra alba can absorb airborne water molecules and carry out maintenance after condensing, prevent the buildings be full of cracks; Adopt above-mentioned dispersion agent, make sliding friction original between the sand grains of sand-cement slurry become rolling friction and produce flowability, also disperse mutually between the cement particle, the cement of cohesion group free-water is discharged, thorough aquation, structure is also more closely knit.

The alternative lime of cement anticrack additive of the present invention, and its consumption only accounts for 0.5 of cement consumption～0.8 ‰, with cement, sand and water mixed preparing sand-cement slurry, can change the workability of sand-cement slurry rapidly in one minute, make that sand-cement slurry viscosity increases, intensity increases, and has activity.

Cement anticrack additive of the present invention can improve the physical and mechanical property of mortar greatly, improve workability, tensile strength, cohesive strength, increase the water-retentivity and the adhesive capacity of mortar, thereby reach the cracking resistance seam of mortar, the purpose of impermeabilisation, the problem of be full of cracks of wall face and top ceiling plaster and hollowing in can solving preferably.

Embodiment

Embodiment one:

Montmorillonite powder 11Kg, terra alba 11Kg are added in the calcining furnace, calcined 2～3 hours down for 140～150 ℃ in temperature, then will be after calcining montmorillonite powder and terra alba and organobentonite 21Kg, light calcined magnesia 24Kg, kaolin 14Kg, pentasodium triphosphate of dispersing agent 9Kg add in the reactor, stirred 2～3 hours, and got this additive through crushing screening.

Embodiment two:

Montmorillonite powder 15Kg, terra alba 15Kg are added in the calcining furnace, calcined 2～3 hours down for 140～150 ℃ in temperature, then will be after calcining montmorillonite powder and terra alba and organobentonite 30Kg, light calcined magnesia 18Kg, kaolin 13Kg, pentasodium triphosphate of dispersing agent 8Kg add in the reactor, stirred 2～3 hours, and got this additive through crushing screening.

Embodiment three:

Montmorillonite powder 19Kg, terra alba 19Kg are added in the calcining furnace, calcined 2～3 hours down for 140～150 ℃ in temperature, then will be after calcining montmorillonite powder and terra alba and organobentonite 39Kg, light calcined magnesia 11Kg, kaolin 11Kg, dispersion agent Sodium dodecylbenzene sulfonate 6Kg add in the reactor, stirred 2～3 hours, and got this additive through crushing screening.

Claims (5)

1. cement mortar additive, it is characterized in that being made up of montmorillonite powder, terra alba, wilkinite, magnesium oxide, kaolin, dispersion agent, its weight proportion is: 10～20 parts of montmorillonite powders, 10～20 parts of terra albas, 20～40 parts of wilkinites, 10～25 parts in magnesium oxide, 10～15 parts of kaolin, 5～10 parts of dispersion agents; Before the preparation, earlier montmorillonite powder and terra alba were calcined 2～3 hours down for 140～150 ℃ in temperature.

2. cement mortar additive according to claim 1 is characterized in that dispersion agent is a tripoly phosphate sodium STPP.

3. cement mortar additive according to claim 1 is characterized in that dispersion agent is an anion surfactant.

4. cement mortar additive according to claim 1 is characterized in that wilkinite is an organobentonite.

5. cement mortar additive according to claim 1 is characterized in that magnesium oxide is light calcined magnesia.