Super-light foam concrete and preparation method thereof

Abstract

The invention discloses super-light foam concrete. The super-light foam concrete is characterized by comprising the following materials in parts by mass: 60-80 parts of ordinary Portland cement, 10-20 parts of rapid hardening sulphoaluminate cement, 2-5 parts of silica fume, 8-15 parts of ultra-fine fly ash, 0.5-1.0 part of a polycarboxylate superplasticizer, 1-2 parts of redispersible powder, 0.05-0.2 part of hydroxypropyl methyl cellulose ether, 0.1-0.4 part of polypropylene fibers, 0.02-0.05 part of a superfine MnO2 catalyst, 4-6 parts of hydrogen peroxide and 50-60 parts of water, wherein a sustained-release gelatin capsule is filled with the superfine MnO2 catalyst and has the collapse time limit of 5-10 min. The invention also discloses a preparation method of the super-light foam concrete. The preparation method is characterized by comprising the steps of weighing, mixing, stirring and pouring. The super-light foam concrete has the advantages of high percentage of close area, low water absorption, high compressive strength and low heat conduction coefficient. The preparation method of the super-light concrete has the advantages that the hydrogen peroxide decomposition efficiency can be improved, and the hydrogen peroxide decomposition speed can be effectively controlled.

Description

technical field [0001] The invention belongs to the field of foam concrete, and in particular relates to an ultra-light foam concrete and a preparation method thereof. Background technique [0002] Chemical foaming agent is a class of chemical substances that can chemically react with other substances or decompose themselves at a certain temperature to produce reactive gases. Chemical foaming agents can be divided into two categories according to the principle of gas foaming: foaming agents that generate gas by pyrolysis and foaming agents that generate gas by reaction. Among them, the most commonly used foaming agents for pyrolysis to generate gas are aluminum powder and hydrogen peroxide. Considering that the hydrogen generated by the reaction of aluminum powder has problems such as too fast gas generation, flammability and explosion, the use of aluminum powder or aluminum paste as a foaming agent has high requirements on the production process and production environment,...

AI Technical Summary

Problems solved by technology

The decomposition speed of hydrogen peroxide is too fast, which will easily lead to mold collapse or high open porosity, while the decomposition speed of hydrogen peroxide is slow and the foaming efficiency is low, which not only leads to an increase in the amount of hydrogen peroxide, but also increases the dry density and thermal conductivity of foamed concrete and reduces the production cost. Increase

Therefore, too fast or too slow hydrogen peroxide decomposition foaming speed is not conducive to the production of foam concrete

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