Foam concrete block manufactured by chemical foaming and manufacture method thereof

Abstract

The invention belongs to the field of application of building materials, and particularly discloses a foam concrete block manufactured by chemical foaming and a manufacture method thereof. The manufacture method comprises the following steps of: with ordinary portland cement, coal ash, superfine slag powder, silica fume, a composite additive, an accelerator, a reinforcing agent, a stabilizer, a water reducing agent, polypropylene fibers, a foaming agent and water serving as the raw materials; mixing all the raw materials, except the foaming agent; stirring at the first grade and the second grade to obtain uniform size; adding the foaming agent to the uniform size and stirring at the third grade quickly; quickly placing the material subjected to third grade stirring into a die; and naturally curing under a condition that the outside temperature is not less than zero. The foam concrete block is free of shrinkage and sinking, collapsing and deforming in the whole process from pouring to solidifying, can realize low density and low heat conductivity coefficient, is large, uniform and relatively independent in bubble, and has a good heat insulating effect.

Description

(1) Technical field [0001] The invention belongs to the application field of building materials, in particular to a foamed concrete block made by chemical foaming and a manufacturing method thereof. (2) Background technology [0002] Foamed concrete, also known as foamed cement, lightweight concrete, etc., is a new type of building energy-saving material that is waste-friendly, environmentally friendly, energy-saving, cheap and non-combustible. Its density generally fluctuates between 300-1030kg / m 3 Among them, because the foamed concrete contains a large number of closed small pores, it has good thermal insulation performance, which is not available in ordinary concrete. Usually the density level is 330kg / m 3 The thermal conductivity of foamed concrete in the above range is between 0.08-0.27w / (m·K), and the thermal resistance is about 10-20 times that of ordinary concrete. The use of foam concrete as building wall and roof materials has good energy-saving effect. [...

AI Technical Summary

Problems solved by technology

[0004] The foam concrete introduced in the building materials industry standard "JC / T 1062-2007 Foam Concrete Block" uses physical methods to prepare foam concrete, and the density level is 300kg / m 3 Above, but compared with physical foaming, chemical foaming has large and independent bubbles. The foaming process is the result of the chemical reaction of the foaming agent itself, and is not restricted by the foaming space, time and area, and the foaming is uniform. In addition, the density of physically foamed blocks is relatively high, the thermal insulation performance is poor, and the application is limited.