A structure-controllable ultra-light foam concrete composite material and its preparation method

Abstract

The invention discloses an ultra-light foam concrete composite material and a preparation method thereof, belonging to the technical field of construction engineering materials. The foam concrete is composed of cement, foaming agent, and organic hollow microspheres, and the water-cement ratio is 0.42 to 0.82; the amount of foaming agent is 1 / 3 of the mass of cement, and the amount of hollow microspheres is 5-5% of the mass of cement. 27%. In the present invention, on the basis of adding foam into the cement slurry to increase the pores, a kind of organic hollow microsphere with controllable pore structure and pore size is added as a lightweight filler into the foamed cement slurry to jointly prepare the foam insulation material to increase the pores. Improve the stability and controllability of the pore structure and pores, give full play to the advantages of the combination of organic and inorganic materials, thereby further reducing the dry density, improving the thermal insulation performance of the material, and reducing the water absorption to a certain extent.

Description

technical field [0001] The invention relates to a construction engineering material, in particular to an ultra-light foam concrete composite material with controllable structure and a preparation method thereof. Background technique [0002] Building thermal insulation materials are used to reduce the heat loss from the indoor to the external environment of the building. It can not only effectively reduce the building air-conditioning load and air-conditioning energy consumption, but also reduce the emission of carbon dioxide and other harmful substances. component. However, in recent years, fires have occurred frequently in building insulation projects in my country. According to incomplete statistics from the Fire Department of the Ministry of Public Security, in the past 10 years, there have been 31,000 high-rise building fires across the country, with 474 deaths and a direct property loss of 1.56 billion yuan. The fire (the new site of CCTV, the teachers’ apartment on Ji...

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Problems solved by technology

[0003] Most of the existing cement-based insulation materials use chemical foaming agents (such as H 2 o 2 , aluminum powder) for foaming, after foaming, the bread will be produced, which needs to be cut off, wasting materials; it cannot be pumped, it cannot be poured on site, and it cannot be poured in large volumes; it has strict requirements on environmental stability, even if the same amount of foaming agent is added, When the temperature is different, the foaming height is different; in addition, there are great safety hazards in the implementation of projects using chemical foaming agents (such as explosions caused by flammable gases)

Compared with it, the method of physical foaming will not produce buns, and it can be flattened after pouring. The process is easy to control, but after adding a large amount of foam, it is difficult to control the quality, prone to production accidents such as mold collapse, and the pore structure is uncontrollable , it is easy to cause the thermal conductivity to be too large

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