Cement composition, foamed cement slurry, foamed concrete pouring material and preparation method thereof

Abstract

The invention relates to a cement composition, a foamed cement slurry, a foamed concrete pouring material and a preparation method thereof, belonging to the technical field of foamed concrete. The cement composition of the invention comprises the following components in parts by weight: 100 parts by weight of Portland cement, 0.5 to 3 parts by weight of foaming agent, 0.2 to 2 parts by weight of thixotropic agent, 0.5 to 2 parts by weight of viscosifier and 3 to 5 parts by weight of early strength agent. By adding thixotropic agent, viscosifier and early strength agent, the thixotropy, viscosity and setting time of the foamed concrete can be changed, the mixing pulping process is beneficial to the foaming agent to foam and can ensure the stability of the foaming which is not easy to crack,thereby avoiding the problem of collapse mode of the foamed concrete pouring material adopting the Portland cement and making the foamed concrete have lower dry density.

Description

technical field [0001] The invention relates to a cement composition, foamed cement slurry, foamed concrete pouring material and a preparation method thereof, belonging to the technical field of foamed concrete. Background technique [0002] Concrete is currently the most widely used man-made building structure material. As a special variety of concrete, foam concrete has the advantages of light weight, heat preservation, heat insulation, sound insulation, non-combustibility, earthquake resistance, waste utilization, etc., and can well meet the requirements of building energy saving and building safety. Therefore, the application of foam concrete is becoming more and more more extensive. When foam concrete is prepared, the foaming agent is generally made into foam by mechanical foaming method, and then the foam is added to the cement slurry to form a foam slurry, which is cured after block or pouring. When Portland cement is used to make foam concrete, due to the poor seal...

AI Technical Summary

Problems solved by technology

When Portland cement is used to make foam concrete, due to the poor sealing and toughness of the bubbles in the foam slurry, and the thin thickness of the bubble liquid film, the foam will burst during the block or in-situ casting process, resulting in the collapse of the new cast body. mold

In view of this problem, in the prior art, rapid-hardening and quick-setting special cement is used instead of Portland cement to prevent mold collapse by shortening the setting and hardening time of the cementitious material. This method has fast hardening speed and good foam-fixing effect, but the fast-hardening and quick-setting special The distribution of cement is not wide, the cost is high, and the strength is lower than that of ordinary portland cement

Another method to prevent mold collapse is to add a large amount of viscosifying substances such as carboxy cellulose and gelatin to the foaming agent to prevent mold collapse by increasing the foam viscosity. This method improves the stability of the foam, but due to the increase in the viscosity of the system , the foaming ability of the foaming agent decreases with the addition of viscosifying substances

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