A preparation method of foam concrete with adjustable pore characteristics

Abstract

The invention relates to a method for preparing foamed concrete with adjustable pore characteristics, which belongs to the technical field of concrete. The foamed concrete includes expansion and contraction materials, cement and mixing water. The preparation method includes mixing ratio design, calculation and weighing of the required materials, Perform pre-absorption treatment on dry expansion and contraction materials, mix cement slurry, and mix the pre-absorption treatment expansion and contraction materials and cement slurry evenly to obtain foam concrete. The present invention can effectively solve the defoaming existing in the existing foam concrete preparation method problem, pore structure problem, shrinkage cracking problem and foaming agent problem; when designing the mix ratio, the present invention takes dry density, design pore size and design strength as design indicators, can adjust the pore characteristics, and also makes up for the existing foam concrete mix ratio In the design method, only the dry density is used as the design index, and the insufficient strength level of the foamed concrete cannot be controlled, so that the produced foamed concrete can meet the dry density and strength requirements 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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