Machine-made sand self-compacting concrete

Abstract

A self-compacting concrete with high affinity, strength and durability is proportionally prepared from cement, powdered coal ash, wollastonite, other mineral additives, polycarboxylic acid type water-reducing agent, viscosity increaser, defoaming agent, mechanically prepared sand and broken stone.

Description

Technical field: [0001] The invention relates to self-compacting concrete used in construction, water conservancy, hydraulic engineering, tunnel and other projects, and belongs to the technical field of concrete. Background technique: [0002] Concrete is the largest building structure material for human beings. With the development of modern engineering structures towards long-span, towering, heavy-duty and harsh environmental conditions, high-strength and high-performance concrete has been widely used in high-rise buildings, bridges, ports, oceans, underground and other projects. Self-compacting concrete is a new type of high-performance concrete. The freshly mixed concrete has very good workability, which significantly improves the filling, compactness and uniformity of the concrete. It can fill the formwork by itself without vibrating under its own weight. Space, forming a uniform and dense concrete structure, so it is widely used in concrete projects that are more suit...

AI Technical Summary

Problems solved by technology

[0005] However, due to the poor particle gradation of the machine-made sand, the particle distribution often shows that there are few in the middle and more at the ends. The particles of the machine-made sand are rough and the content of stone powder is high. Therefore, it is often easy to cause fresh concrete to have poor cohesion, water retention, segregation, and bleeding. Reduced workability and fluidity