Self-compacting, self-stressing and self-curing high-strength concrete and preparation method thereof

Abstract

The invention belongs to the technical field of building materials, and particularly relates to self-compacting, self-stressing and self-curing high-strength concrete and a preparation method thereof. The self-compacting, self-stressing and self-curing high-strength concrete is prepared by mixing cement, fly ash, mineral powder, microbeads, medium sand, gravel, an expanding agent, high molecular absorbent resin SAP, a polycarboxylate superplasticizer and water according to a certain ratio. Through the adoption of the polycarboxylate superplasticizer and addition of a mineral admixture, the concrete is not required to be vibrated and can be compacted through self-leveling; through the addition of the high-efficiency expanding agent, the concrete generates initial self-stress, drying self-shrinkage of the concrete is reduced, and disengagement, a pitted surface and other engineering problems of steel tube concrete are solved; through the addition of the pre-absorbent high molecular resin SAP into the concrete, the problem that the steel tube concrete is difficult to cure is solved. Therefore, the self-compacting, self-stressing and self-curing high-strength concrete has a wide engineering application prospect.

Description

Technical field [0001] The invention relates to a self-compacting, self-stressing and self-curing high-strength concrete and a preparation method thereof, belonging to the technical field of building materials. Background technique [0002] With the rapid development of high-rise and super-high-rise building structures and large-span bridge structures, the application of high-strength and ultra-high-strength concrete has become more and more extensive. The concrete-filled steel tube structure composed of high-strength and ultra-high-strength concrete and high-strength steel can reduce the building area and increase the bearing capacity of components. [0003] In high-strength concrete, the amount of cementing material is large, the water-to-binder ratio is low, and the cementing material is not fully hydrated, resulting in a large auto-shrinkage of the concrete. In the concrete-filled steel tube, there are engineering problems such as the void of the steel tube and the concrete an...

AI Technical Summary

Problems solved by technology

[0005] In order to solve engineering problems such as serious self-shrinkage of high-strength concrete with steel tubes, difficulty in maintenance, voids between steel tubes and concrete, pitting, etc., the invention provides a self-compacting, self-stressing, self-curing high-strength concrete and a preparation method thereof

Images