Underwater antidispersion concrete admixture for building

Abstract

The present invention relates to an underwater antidispersion concrete additive, which is formed from methyl cellulose, polyacrylamide, sodium dodecyl benzene sulfonate, naphthalene series high-effective water reducing agent, octadecanoic acid and zeolite powder. Said invention can be used for underwater direct pouring construction, does not disperse or does not separate, and can automatically fill form and automatically compact under water, and can raise the concrete structure body performance after the concrete is poured under water, and can simplify underwater pouring process and reduce environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to an underwater anti-dispersion concrete admixture for building water. Background technique [0002] Ordinary concrete is directly poured underwater. Due to the impact of water flow, the cement paste and aggregates in the concrete mixture are severely separated, and the cement paste will be washed away by the water flow. Not only is there less cement paste in the cast body, but also water The / glue ratio is greatly increased, the uniformity of the concrete structure is extremely poor, and the strength and durability are seriously reduced. It is unimaginable that the use of ordinary concrete for underwater pouring will cause pollution to the surrounding water environment and damage to aquatic organisms. [0003] Over the years, in order to improve the quality of ordinary concrete poured underwater structures, engineering units have also adopted a variety of special const...

AI Technical Summary

Problems solved by technology

However, looking at the research and application results of underwater anti-dispersion concrete in the past, due to the limitations of the anti-dispersion agent used and the performance of the prepared underwater anti-dispersion concrete, the strength level of the poured underwater anti-dispersion concrete is generally low ( Below C30), corrosion resistance, frost resistance, and Cl resistance to underwater anti-dispersion concrete - There are fewer studies on durability such as permeability, and it is increasingly incompatible with the new requirements of actual engineering for the mechanical properties and durability of underwater anti-dispersion concrete.

In addition, the traditional anti-dispersant has a large dosage and high cost, which also limits the use of actual projects.

[0005] In related patents, there are also reports of preparing underwater anti-dispersion concrete by simply adding cellulose or polypropylene viscosifier (water retaining agent), but the water and land strength ratio of the prepared concrete is only 65%-70% ( 7 days) and 70%-75% (28 days), and the slump loss of concrete is relatively large, so it is not suitable for long-distance transportation and pumping construction