A preparation method of foam concrete with adjustable pore characteristics

A foam concrete, adjustable technology, applied in the field of concrete, can solve the problems affecting the construction progress, uneven pore size, and inability to accurately control the characteristics of foam concrete pores, so as to speed up the construction progress and inhibit the effect of early drying shrinkage

Active Publication Date: 2022-04-08
SHANDONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • A preparation method of foam concrete with adjustable pore characteristics
  • A preparation method of foam concrete with adjustable pore characteristics
  • A preparation method of foam concrete with adjustable pore characteristics

Examples

Experimental program
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Effect test

Embodiment 1

[0072] A method for preparing foamed concrete with adjustable pore characteristics. The foamed concrete includes expansion-shrinkage material, cement and mixing water. The expansion-shrinkage material is selected from polyacrylate type superabsorbent resin, comprising the following steps:

[0073] S1, calculate the required cement mass m per cubic meter according to the mix ratio design method b , dry expansion and contraction material mass m q , The pre-absorbed water mass m′ required by the expansion and contraction material w and the mass of mixing water m w ;

[0074] S2, calculate and weigh the amount of each material in step S1 according to the pouring volume (including the quality of cement, the quality of dry expansion-shrinkage material, the quality of pre-absorbed water required by the expansion-shrinkage material and the quality of mixing water), and the weighing accuracy is ±0.5% ;

[0075] S3, perform pre-absorption treatment on the dry expansion-shrinkage mat...

Embodiment 2

[0080] A method for preparing foamed concrete with adjustable pore characteristics, as described in Example 1, the difference is that the method for designing the mix ratio in step S1 includes the following steps:

[0081] A. Design of pore characteristics: Calculate the particle size of the dry expansion-shrinkage material required according to the design pore size of the foam retarded concrete and the water absorption expansion coefficient of the expansion-shrinkage material, and the specific calculation is as follows:

[0082]

[0083] In the formula (1), d is the particle size of the dry expansion and contraction material, mm;

[0084] is the design aperture of foam concrete, mm;

[0085] α is the water absorption volume expansion coefficient of the expansion-shrinkage material, that is, the ratio of the volume of the expansion-shrinkage material after absorbing water to the volume of the expansion-shrinkage material in a dry state;

[0086] B. Calculate the water-ce...

Embodiment 3

[0124] A method for preparing foamed concrete with adjustable pore characteristics, as described in Example 2, the difference is that the pre-absorption rate k, the density ρ of the expansion-shrinkage material after the pre-absorption treatment p , and the water absorption volume expansion coefficient α of the expansion-shrinkage material is determined by the following method:

[0125] Add a certain quality of dry expansion-shrinkage material into a certain amount of water for pre-absorption treatment for 10 minutes to obtain the expansion-shrinkage material after pre-absorption treatment, and then add the expansion-shrinkage material after pre-absorption treatment into the cement slurry, It is necessary to measure the flow value of the cement slurry before adding the shrinkage material. The flow value test method can refer to the regulations in the "Technical Regulations for Cast-in-place Foam Lightweight Soil" CECS: 2008. The expansion-shrinkage material after pre-absorption...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G16C60/00C04B28/00C04B38/08
CPCG16C60/00C04B28/00C04B38/08C04B38/0074C04B38/0051C04B22/002C04B24/2641C04B24/282
Inventor 葛智段龙飞袁化强高雪池刘鹏张洪智孙仁娟田隽刘赫然霍延强黄河滨
Owner SHANDONG UNIV
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