CN103274633B - Composite type cement-based whiskering resistant admixture - Google Patents

Abstract

A composite type cement-based whiskering resistant admixture comprises the components in parts by weight as follows: 45-60 parts of a waterproof agent FZ, 19-20 parts of a water retention thickening agent PW and 25-60 parts of calcium stearate, wherein the waterproof agent FZ comprises components in percentage by weight as follows: 20-45% of superfine slag powder, 45-70% of silicon ash and 3-10% of a water reducing agent; the water retention thickening agent PW comprises components in percentage by weight as follows: 0.1-0.6% of attapulgite clay, 0.03-0.15% of a non-ionic type defoaming agent, 5-10% of cellulose ether, 55-75% of the superfine slag powder and 20-30% of the water reducing agent. The prepared composite type cement base whiskering resistant admixture can remarkably improve the whiskering resistance and the durability of cement-based materials under the precondition that the performance of the cement-based materials of cement mortar, concrete and the like is guaranteed to be not reduced or somewhat improved.

Description

Composite cement-based anti-pantherine admixture

technical field

The invention belongs to the field of cement mortar, concrete and cement products, and in particular relates to a composite cement-based anti-efflorescence admixture.

Background technique

The problem of efflorescence in cement-based materials has a long history, and has not been effectively solved so far due to the constraints of raw materials, cost, production, construction and environment. Pan-alkaline is also known as whitening, whitening, frosting or blooming. It is generally in the form of white powder, flocs or flakes. It is more common in low-temperature, ventilated and humid shady surfaces. Panthene is usually the main component of Portland cement, Ca ²⁺ and OH ^- generated after hydration of calcium silicate - under the capillary pressure, penetrates to the surface with moisture, and forms a water-insoluble white color with CO ₂ in the air Calcium carbonate crystals. The phenomenon of efflorescence seriously affects the appearance quality and durability of mortar, concrete and cement products, and also destroys the decorative effect of buildings. From the process of efflorescence, it can be seen that the three necessary conditions for the formation of efflorescence are: (1) the existence of soluble alkali; (2) the water containing dissolved alkali in the cement-based material; (3) having a hydrophilic pore system. Therefore, as long as any one of the above three conditions is solved or all three aspects are effectively restricted, the ubiquitous alkalescence phenomenon can be effectively inhibited.

At present, most of the additives on the market for inhibiting efflorescence of cement substrates are waterproofing agents, water-repellent agents, latex powder, etc., and the effects of efflorescence are not ideal.

Contents of the invention

Technical problem to be solved: In order to effectively solve the efflorescence problem of various cement-based materials, the present invention provides a composite cement-based anti-efflorescence admixture, which improves the structure of cement mortar and can obviously eliminate the efflorescence phenomenon generation.

Technical solution: Composite cement-based anti-efflorescence admixture, including the following components and weight ratio:

Waterproofing agent FZ: 35-60 parts, composed of 20-45% of slag powder, 45-70% of silica fume and 3-10% of water reducing agent;

Water-retaining thickener PW-1: 9-20 parts, composed of attapulgite 0.1-0.6%, non-ionic defoamer 0.03-0.15%, cellulose ether 5-10%, slag powder 55-70% and water reducing Agent 20~30%;

Calcium stearate: 25-60 parts.

The preferred weight percentages of the composition waterproofing agent FZ are 30% of slag powder, 65% of silica fume, and 5% of water reducing agent.

The slag fine powder is S75-S105 slag powder.

The content of active silicon dioxide in the silica fume is not less than 80%wt.

The described water reducer meets the requirements of the "Concrete Admixture" GB 8076-2008 standard.

The preferred weight percentages of the components of the water-retaining thickener PW-1 are: attapulgite 0.4%, nonionic defoamer 0.1%, cellulose ether 6.6%, slag fine powder 66%, and water reducer 26.9%.

The attapulgite is obtained by calcining raw ore attapulgite clay at 400° C. to 850° C. for 1 hour to 4 hours.

The viscosity of the cellulose ether is 20,000-100,000 cellulose ether.

The calcium stearate described complies with the chemical industry standard HG/T 2424-93 "Calcium stearate (light)" of the People's Republic of China, the calcium content ranges from (6.5±0.7)%, and the free calcium in terms of stearic acid≤ 0.5%wt, heating loss ≤3.0%wt, melting point ≥125°C, 0.075mm sieve passing fineness greater than or equal to 99.0%.

Beneficial effects: the compound anti-pantherine admixture prepared by the present invention can significantly improve the anti-pantherine and durability of cement-based materials under the premise of ensuring that the properties of cement-based materials such as cement mortar and concrete are not reduced or improved .

Description of drawings

Figure 1 is the situation of efflorescence on the surface of plastering mortar, wherein Figure 1a is the 1# test piece, and Figure 1b is the 2# test piece;

Figure 2 is the efflorescence situation on the surface of tile grouting agent, wherein Figure 2a is the 1# test piece, and Figure 2b is the 2# test piece;

Figure 3 is the situation of efflorescence on the surface of the adhesive, wherein Figure 3a is the 1# test piece, and Figure 3b is the 2# test piece;

Figure 4 shows the situation of efflorescence on the surface of imitation cultural stone, in which Figure 4a is the 1# test piece, and Figure 4b is the 2# test piece.

Detailed ways

The following examples further illustrate the content of the present invention, but should not be construed as limiting the present invention. Without departing from the spirit and essence of the present invention, the modifications and substitutions made to the methods, steps or conditions of the present invention all belong to the scope of the present invention.

Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

Example 1

The application of a compound anti-pantherine admixture of the present invention in the plastering mortar of Example 1, the formula is as follows:

(1) Formula

Mix the components of the above 1﹟ and 2﹟ plastering mortar formulations evenly, add water, and stir evenly with a mixer. The consistency of 1# is 89mm, and the consistency of 2# is 90mm. According to the method provided by National Starch Company, apply the evenly stirred test sample on the surface of double-sided unglazed ceramic tiles of 150mm×150mm×10mm. After 2 hours of molding, the low temperature and high humidity cycle was carried out. The surfaces of the specimens with the two formulas were shown in Figure 1 (a) and (b) respectively (see the attachment). There was no efflorescence phenomenon on the surface of the obtained test piece. Thus it can be seen that in the present invention, the composite anti-pantherine admixture can well inhibit the pan-pantherine of the plastering mortar.

Example 2

The application situation of a kind of composite anti-panthenic alkali admixture of the present invention in embodiment 2 ceramic tile grouting agent, formula and performance index are as follows:

(1) Formula

(2) Test piece fabrication and test observation

Mix the components of the above 1﹟ and 2﹟ ceramic tile jointing agent formulations evenly, add water, and stir evenly with a mixer. According to the method provided by National Starch Company, apply the evenly stirred test sample on the surface of double-sided unglazed ceramic tiles of 150mm×150mm×10mm. After 2 hours of molding, the low temperature and high humidity cycle was carried out. The surfaces of the specimens with the two formulas were shown in Figure 2 (a) and (b) respectively (see the attachment). The surface of the obtained test piece was free of efflorescence. Thus it can be seen that in the present invention, the composite anti-efflorescence admixture can well suppress the efflorescence phenomenon of cement-based ceramic tile grouting agent.

Example 3

The application situation of a kind of composite type anti-pantherine admixture of the present invention in embodiment 3 ceramic tile adhesive, formula and performance index are as follows:

(1) Formula

(2) Test piece fabrication and test observation

Mix the components of the above 1﹟ and 2﹟ binder formulations evenly, the amount of water added is determined according to the consistency of 90-100mm, and then stir evenly with a mixer. According to the method provided by National Starch Company, apply the evenly stirred test sample on the surface of double-sided unglazed ceramic tiles of 150mm×150mm×10mm. After 2 hours of molding, the low temperature and high humidity cycle was carried out. The surfaces of the specimens with the two formulas were shown in Figure 3 (a) and (b) respectively (see the attachment). The surface of the obtained test piece was free of efflorescence. It can be seen that in the present invention, the composite anti-pantherine admixture can well suppress the pan-alkaline phenomenon of the cement-based material binder.

It can be seen from the above table that a composite anti-pantherine admixture of the present invention can obviously inhibit the efflorescence of cement-based materials, and has excellent performance and reasonable formula.

Example 4

The application situation of a kind of composite anti-pantherine admixture of the present invention in embodiment 4 imitation culture stone (a kind of cement product), formula and performance index are as follows:

(1) Formula

(2) Test piece fabrication and test observation

Mix the components of the above 1﹟ and 2﹟ imitation cultural stone formulas evenly, add water, and stir evenly with a mixer. Then it is molded in a specific mold, demoulded after steam curing and subjected to low temperature and high humidity cycle. The surfaces of the two formula test pieces are shown in Figure 4 (a) and (b) respectively (see the attachment). It is found that the 1﹟ formula obtained The surface of the test piece obtained by the 2﹟ formula has severe efflorescence, and the surface of the test piece obtained by the 2﹟ formula has no efflorescence. Thus it can be seen that in the present invention, the composite anti-pantherine admixture can well suppress the pan-alkaline phenomenon of cement-based material imitation cultural stone products.

It can be seen from the above table that a composite anti-efflorescence admixture of the present invention can obviously inhibit the efflorescence of imitation cultural stone of cement-based materials, and can obviously improve various properties of imitation cultural stone, and the formula is reasonable.

The technical scope of this invention is not limited to the content in the manual, and relevant staff can make various changes and modifications within the scope of not deviating from the technical idea of this invention.

Claims (8)

1. the anti-accumulation of salt in the surface soil additive of composite cement base, is characterized in that comprising following component and weight proportion:

Waterproofing agent FZ:35 ~ 60 part, consist of slag micropowder 20 ~ 45%, silicon ash 45 ~ 70% and water reducer 3 ~ 10%;

Water-retaining admixture PW-1:9 ~ 20 part, consist of recessed native 0.1 ~ 0.6%, nonionic defoamer 0.03 ~ 0.15%, cellulose ether 5 ~ 10%, slag micropowder 55 ~ 70% and water reducer 20 ~ 30%; Each constituent content sum is 100%; Described recessed soil is that raw ore Concave-convex clay rod calcines 1 hour ~ 4 hours gained at 400 DEG C ~ 850 DEG C;

Calcium stearate: 25 ~ 60 parts.

2. the anti-accumulation of salt in the surface soil additive of composite cement base according to claim 1, is characterized in that, the preferred weight percent of described composition waterproofing agent FZ is slag micropowder 30%, silicon ash 65%, water reducer 5%.

3. the anti-accumulation of salt in the surface soil additive of composite cement base according to claim 1, is characterized in that, described slag micropowder is S75 ~ S105 breeze.

4. the anti-accumulation of salt in the surface soil additive of composite cement base according to claim 1, is characterized in that, in described silicon ash, the content of active silica is not less than 80%wt.

5. the anti-accumulation of salt in the surface soil additive of composite cement base according to claim 1, is characterized in that, described water reducer meets the water reducer of " concrete admixture " GB 8076-2008 standard-required.

6. the anti-accumulation of salt in the surface soil additive of composite cement base according to claim 1, is characterized in that, the preferred weight percent of the described each composition of water-retaining admixture PW-1 is: recessed native 0.4%, nonionic defoamer 0.1%, cellulose ether 6.6%, slag micropowder 66%, water reducer 26.9%.

7. the anti-accumulation of salt in the surface soil additive of composite cement base according to claim 1, is characterized in that, described viscosity of cellulose ether is 20,000 ~ 100,000 cellulose ethers.

8. the anti-accumulation of salt in the surface soil additive of composite cement base according to claim 1, it is characterized in that, described calcium stearate meets People's Republic of China (PRC) chemical industry standard HG/T 2424-93 " calcium stearate (lightweight) ", calcium content scope is (6.5 ± 0.7) %, in stearic acid free calcium≤0.5%wt, heating loss≤3.0%wt, fusing point >=125 DEG C, 0.075mm sieve is more than or equal to 99.0% by fineness.