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Non-autoclaved foam concrete material and preparation method thereof

A foamed concrete, autoclaved-free technology, applied in the field of building materials and foamed concrete preparation, can solve the problems of complex preparation process, hidden dangers, product burst cracks, etc., achieve uniform pore structure, reduce hydration heat, and prevent fine cracks. Effect

Inactive Publication Date: 2017-12-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a kind of autoclaved foam concrete material without autoclaving in view of the relatively complicated preparation process and high cost of the autoclaved foam concrete composite material. Another purpose of the present invention is to provide the preparation of the above-mentioned material method
Although the pressure steaming process can be used to prepare foamed concrete that meets the requirements, there will also be certain problems in the production process: such as the temperature difference between the steam in the kettle and the surface of the sample inside the sample is too large, resulting in the temperature difference between the surface and the inside. Cracks due to inconsistency must control the heating rate; in the stage of constant temperature and pressure, the pressure, temperature and curing time in the kettle must be strictly controlled; in the stage of pressure drop and temperature drop, the product may burst and become loose due to excessive pressure difference and temperature difference and strength decline; the main problems of autoclaved curing are high energy consumption and pollution, and there are also potential safety hazards

Method used

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  • Non-autoclaved foam concrete material and preparation method thereof
  • Non-autoclaved foam concrete material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In terms of parts by mass, prepare 88 parts of cement (86 parts of PO42.5 ordinary Portland cement and 2 parts of R·SAC52.5 sulfoaluminate cement), 2 parts of quartz sand, and a specific surface area of ​​800m 2 10 parts / kg slag powder, 1.4 parts of aluminum powder chemical foaming agent with a mass fraction of 60%, 1.2 parts of admixture (0.6 part of rosin acid soap foam stabilizer, 0.2 part of polycarboxylate water reducer, early strength agent MgCl 2 0.4 parts), polypropylene fiber 0.6 parts, NaOH 1.4 parts.

[0030] First, mix cement, quartz sand, slag powder and water evenly under the condition of mechanical stirring, add fiber, additives and water reducer in the admixture to the mixer and mix for 2 minutes at a stirring speed of 1000rpm; then add the foam stabilizer in the admixture Add foaming agent, early strength agent and other admixtures, mix with cement slurry for 40s, the mixer speed is 1500rpm; finally add foaming agent and cement slurry and mix for 20s, s...

Embodiment 2

[0032] In parts by mass, prepare 92 parts of cement (88 parts of PO42.5 ordinary Portland cement and 4 parts of R·SAC52.5 sulfoaluminate cement), 2 parts of quartz sand, 800m 2 / kg 6 parts of slag powder, 2 parts of chemical foaming agent, 0.8 part of admixture (0.2 part of rosin acid soap foam stabilizer, 0.2 part of polycarboxylate superplasticizer, early strength agent MgCl2 0.4), 0.5 parts of polypropylene fiber, and 1.3 parts of NaOH as an auxiliary agent.

[0033] First, mix the cement and water evenly under the condition of mechanical stirring, add the fiber, additives and water reducing agent in the admixture to the mixer and mix for 3 minutes, and the stirring speed is 1200rpm; then add the foam stabilizer, early strength agent and admixture in the admixture Mix other additives, mix with cement slurry for 60s, the mixer speed is 1500rpm; finally add foaming agent and cement slurry and mix for 30s, stirring speed is 1200rpm, continue stirring for 30s, mixer speed is 300...

Embodiment 3

[0035] In parts by mass, prepare 92 parts of PO42.5 ordinary Portland cement, 5 parts of quartz sand, 800m 2 / kg 6 parts of slag powder, 2 parts of chemical foaming agent, 1.4 parts of admixture (0.6 part of rosin acid soap foam stabilizer, 0.3 part of polycarboxylate water reducer, early strength agent MgCl 2 0.5 parts), polypropylene fiber 0.6 parts, NaOH 1.4 parts.

[0036] First, mix cement, quartz sand, slag powder and water evenly under the condition of mechanical stirring, add fiber, additives and water reducer in the admixture to the mixer and mix for 3 minutes at a stirring speed of 1200rpm; then add the foam stabilizer in the admixture Add foaming agent, early strength agent and other additives, mix with cement slurry for 50s, the mixer speed is 1600rpm; finally add foaming agent and cement slurry and mix for 30s, stirring speed is 1200rpm, continue to stir for 30s, mixer speed is 3000rpm; The material mass ratio is 0.56. Inject the stirred foam concrete slurry int...

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Abstract

The invention relates to a non-autoclaved foam concrete material and a preparation method of the material. The non-autoclaved foam concrete material is characterized by comprising the following raw material ingredients in parts by weight: 85-96 parts of cement, 2-8 parts of fine sand, 2-10 parts of slag powder, 1.4-2.2 parts of chemical foaming agent, 0.7-1.5 parts of additive, 0.5-1.0 part of fiber and 1-1.5 parts of assistant, wherein the additive is a foam stabilizer, a water reducer and an early strength agent, and a water-material mass ratio is 0.55-0.6. The prepared foam concrete material can reach various performance indexes (foam concrete JG / T 266-2011); various performance is excellent; and the method is simple and practicable, low in cost, obvious in energy conservation effect and appropriate for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of foam concrete preparation, in particular to an autoclaved-free foam concrete material and a preparation method thereof, belonging to the technical field of building materials. Background technique [0002] In recent years, foam concrete has attracted the attention of the entire external wall insulation material market due to its inorganic and non-combustible properties. [0003] At present, most of the foamed concrete on the market uses aluminum powder as the foaming agent, and it is also produced by the autoclave curing process. Not only the cost is high, but also the requirements for autoclave equipment are high. The energy consumption in the autoclave process is relatively large (the bulk density is 600kg / m 3 The fuel consumption of autoclaved foam concrete block production is about 25kg / m 3 ), may also cause secondary pollution. Compared with autoclaved foam concrete technology, the autoclaved-free...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/06C04B28/08C04B38/02
CPCC04B28/04C04B28/06C04B28/08C04B2201/20C04B2201/32C04B2201/50C04B7/02C04B14/06C04B18/141C04B22/04C04B24/085C04B24/24C04B22/12C04B16/0633C04B22/062C04B38/02
Inventor 潘志华徐赛赛杨刘琨刘劲松
Owner NANJING UNIV OF TECH
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