Preparation method of foam concrete with adjustable pore characteristics

Abstract

The invention relates to a preparation method of foam concrete with adjustable pore characteristics, and belongs to the technical field of concrete. The foam concrete comprises an expansion and shrinkage material, cement and mixing water. The preparation method comprises the following steps: designing a mixing ratio, calculating and weighing the mass of each required material, carrying out pre-water-absorption treatment on the dry expansion and shrinkage material, stirring cement slurry, and uniformly stirring the expansion and shrinkage material subjected to the pre-water-absorption treatmentand the cement slurry to obtain the foam concrete. According to the invention, the problems of defoaming, pore structure, shrinkage cracking and foaming agent in the existing foam concrete preparation method can be effectively solved; during blending ratio design, the dry density, the designed pore diameter and the designed strength are taken as design indexes, the pore characteristics can be adjusted, the defect that the strength grade of the foam concrete cannot be controlled due to the fact that only the dry density is taken as the design index in an existing foam concrete mix proportion design method is overcome, and the produced foam concrete can meet the requirements for the dry density and the strength at the same time.

Description

technical field [0001] The invention relates to a method for preparing foam concrete with adjustable pore characteristics, and belongs to the technical field of concrete. Background technique [0002] Foam concrete is usually made by mechanically preparing foaming agent aqueous solution into foam, and then adding the foam to the slurry composed of cementitious material, water and various additives, etc., after mixing, pouring and curing. Concrete with a large number of closed pores inside. Foam concrete has the advantages of light weight, heat preservation, fire resistance, environmental protection and sound insulation, etc. It can be used in roadbed replacement, lean concrete fill, roof slope, pipeline backfill, landscaping, etc. It is one of the good choices of building materials. [0003] Although foamed concrete has good physical and mechanical properties, the following problems mainly exist in the preparation process of existing foamed concrete: [0004] 1) During the...

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Problems solved by technology

[0004] 1) During the pouring process of foam concrete, the defoaming phenomenon will occur due to the influence of self-weight, resulting in the need for layered pouring and the limited pouring height of each layer during the construction of foam concrete, which will affect the construction progress;

[0005] 2) The existing preparation method can only control the amount of blowing agent but cannot accurately control the internal pore characteristics of foamed concrete, and the phenomenon of uneven pore size is prone to occur, and the pores are easy to form connectivity in concrete, which affects the performance of foamed concrete;

[0006] 3) The mix ratio design of the existing preparation method usually takes the dry density as the design index, which can only control the dry density level and cannot control the strength level at the same time;

[0007] 4) There are many cementitious materials in the raw materials, and the water-cement ratio is large, which can easily lead to shrinkage and cracking of foamed concrete;

[0008] 5) Foaming agents need to be used in the existing preparation methods. The foaming agents produced by different manufacturers have different performances, which will lead to poor stability of the slurry, poor mechanical properties and frost resistance of the hardened body, and poor foamed concrete pouring. During the process, defoaming will occur due to the influence of self-weight, resulting in the need for layered pouring of foam concrete during construction and the height of each layer is limited, affecting the construction progress

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