Lightweight and high-strength anti-crack auxiliary material and method for improving concrete anti-crack and thermal insulation performance

Abstract

The invention discloses a light high-strength crack-resistance auxiliary material and a method for improving the crack resistance and heat preservation performance of concrete.The light high-strength crack-resistance auxiliary material is prepared from light high-strength spherical burn-free ceramisite and a special interface agent.According to the adopted ceramisite, the particle size ranges from 8 mm to 15 mm, the loose bulk density ranges from 800 kg / m3 to 1000 kg / m<3>, the cylinder compressive strength ranges from 4 MPa to 6.5 MPa, and the water absorption ranges from 15% to 25%.An organic additive serves as the interface agent, bonding strength of the burn-free ceramisite and a mortar interface can be remarkably improved, and moisture in the burn-free ceramisite and the mortar interface can be slowly released.The using quantity of the crack-resistance auxiliary material is 10-25% of the volume of pumped concrete, the structural crack resistance and heat preservation performance of concrete are remarkably improved, and self-curing is achieved.The light high-strength crack-resistance auxiliary material can be applied to the cast-in-situ concrete pumping construction process of floors, the ground and roofs of buildings.

Description

technical field [0001] The invention belongs to the field of civil engineering materials, and relates to an anti-crack auxiliary material made of light-weight high-strength ceramsite and a method for improving the anti-crack and heat preservation performance of concrete. Background technique [0002] As we all know, the floor, ground and roof of the building are characterized by large area, but the thickness is only 100-150mm, which belongs to large-area concrete. The pumped concrete used for this type of structure generally has a strength grade of C30~C40, an actual slump of 180±30mm, high fluidity, high sand content, less stones, and poor concrete workability. A 20-30mm mortar layer often appears on the surface, accompanied by bleeding. As a result, the uniformity of the concrete becomes very poor, and the mortar on the surface layer is very easy to crack, and cracks from the surface to the inside often appear. In the case of environmental changes such as temperature and...

AI Technical Summary

Problems solved by technology

As a result, the uniformity of the concrete becomes very poor, the mortar on the surface layer is very easy to crack, and cracks from the surface to the inside often appear

In the case of environmental changes such as temperature and humidity and irregular construction control and maintenance, some cracks are very serious and must be repaired at a high price, otherwise the use function and long-term durability of the structure will be seriously affected

[0003] On the other hand, with the improvement of national energy-saving building requirements, the concrete floor, ground and roof must be laid with insulation layer, and the cost per m 2 As high as 40-60 yuan, and organic foam plastic boards are often used, and there is a danger of fire