Ultra-high-performance concrete including regenerated fine aggregates and application method thereof

Abstract

The invention discloses ultra-high-performance concrete including regenerated fine aggregates and an application method thereof. The ultra-high-performance concrete comprises the following raw materials: ordinary silicate cement, silica fume, quartz powder, fine aggregates and a water reducing agent with a mass ratio of 1:0.25-0.35:0.35-0.40:1.0-1.2:0.02-0.03:0.20-0.25, and the volumetric fraction of steel fiber is 0.5-3%. The fine aggregate comprises the following components in percentage by weight: 30-100% of regenerated fine aggregates and 0-70% of natural sand, wherein the regenerated fine aggregates belong to quasi-regenerated fine aggregates, with a particle range of 0.15-1.18mm or 0.15-4.75mm. The natural sand is replaced with regenerated fine aggregates, and thus exploitation of the natural sand can be reduced. The regenerated fine aggregates belong to solid waste, and are abundant in source, so that the regenerated fine aggregate ultra-high-performance concrete has good economic, social and environment-friendly benefits, and is applicable to large-scale popularization and application.

Description

technical field [0001] The invention belongs to the field of ultra-high-performance concrete, and in particular relates to a recycled fine aggregate ultra-high-performance concrete and a use method thereof. Background technique [0002] Ultra-high performance concrete is an ultra-high-strength cement-based material with high strength, high toughness, and low porosity. Although it has not been around for a long time, it has been applied in the field of engineering construction because of its good mechanical properties and excellent durability. The world's first pedestrian bridge made of RPC is located in Sherbrooke, Canada, where the weather conditions are harsh. Under the high humidity environment, frequent deicing salt corrosion and freeze-thaw cycles, the bridge has been in good condition so far. [0003] Ultra-high performance concrete is composed of ordinary Portland cement, silica fume, quartz powder, natural sand and steel fiber, and is made by mixing, pouring and aut...

AI Technical Summary

Problems solved by technology

[0007] At present, there are no relevant patents and reports on the use of recycled fine aggregate in ultra-high performance concrete. It may be that compared with natural sand, the performance of recycled fine aggregate is poor, and the use of recycled fine aggregate in the preparation of ultra-high performance concrete may greatly reduce the cost. However, according to the existing patents, since steel fibers play a leading role in inhibiting the development of cracks and improving the strength of concrete, waste concrete powder has been used in ultra-high performance concrete, and machine-made sand is used to prepare ultra-high performance concrete. High performance concrete is also possible