LC-01 type foam concrete foamer

Abstract

The invention discloses an LC-01 type foam concrete foamer which belongs to a high-efficiency concrete air entraining agent. The invention adopts foaming time of the LC-01 type foam concrete foamer prepared form a double (multi) hydrophilic group surface active agent and a stabilizing agent; if the surface active agent and the stabilizing agent are diluted by the ratio of 1 to 100, 5.0 to 5.6m3 / kgis achieved; cement and powdery coal ash slurry are touched; the deforming rate is less than 12%; and four-stage foam concrete of more than 4m3 / kg can be produced; the cement is touched and defoamingis hardly operated; the four-stage foam concrete (containing 40% of powdery coal ash) which is larger than or equal to 3.5 to 3.8m3 / kg can be produced; and the compressive strength of the four-stagefoam concrete is from 1.2 to 1.5MPa. The invention better solves the contradiction between the foaming time of the foam concrete foamer and the stability when the foam comes into contact with the concrete slurry and enhances the production quantity and the compressive strength of the foam concrete for the foamer of each kilogram severalfold.

Description

technical field [0001] The invention relates to a foam concrete foaming agent composition, which belongs to concrete high-efficiency air-entraining agent and concrete additive in a broad sense. Background technique [0002] Foamed concrete, also known as foamed cement, is to introduce nitrogen, carbon dioxide, oxygen or air into the concrete slurry according to the application needs through chemical or physical means, and after molding and reasonable maintenance, it forms a large number of pores and has a certain strength. concrete products. Foam concrete is often graded according to density, that is, grade 3 is 300kg / m 3 , 400kg / m for grade 4 3 ,……. Lightweight foam concrete generally refers to grade 3-6 foam concrete. [0003] Foam concrete was first proposed by the Swiss in the 1930s, and was used in construction projects in the United States and the Soviet Union in the 1950s. my country began to introduce and apply this technology in the 1990s. Due to its light wei...

AI Technical Summary

Problems solved by technology

However, so far, there are still many people in the industry who still judge the quality of blowing agents based on the foaming ratio, bleeding and the stability time of the foam alone.

Experimental facts have proved that when foam exists alone, even if its half-life can reach several days, it cannot guarantee that it will not break a large amount of foam when it contacts cement and fly ash slurry, nor can it guarantee that it will not affect the setting of concrete

In addition, there is another misunderstanding in the current research on foaming agents, that is, they only go around in the circle of conventional surfactants and foam stabilizers, without considering the chemical characteristics of cement and fly ash slurry. Only focus on finding surfactants with good foaming properties and foam stabilizers that can be compatible with them and increase the viscosity of the foam surface

As a result, the surface viscosity of the foam is small and the expansion ratio is high, but the foam is severely broken when it contacts cement and fly ash slurry, and the surfactant after the foam breaks is adsorbed on the surface of cement and fly ash particles, which seriously affects the coagulation of cement ; The surface viscosity of the foam is large, although it is rarely broken when it contacts cement and fly ash slurry, the foaming ratio is significantly reduced, and the output of foamed concrete per unit mass of foaming agent is reduced

In short, unreasonable evaluation criteria and incorrect ideas for foam concrete foaming agents have caused people to fail to find a foaming agent with superior performance for a long time.

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