A kind of high folding ratio concrete and preparation method thereof

Abstract

The invention discloses high compressive strength ratio concrete and a preparation method thereof. The concrete comprises the following constituents: cement, mineral admixtures, coarse aggregate, fine aggregate, water and an additive with the weight ratio of (12-16):(6-9):(37-46):(25-33):(6-7):(0.4-0.8). By replacing frequently used coarse and fine aggregate through porous basalt and water-quenching blast furnace slags and improving the preparation method, the high compressive strength ratio concrete with high bending strength, good durability and low cost is prepared, the bending strength of the concrete can reach more than 7.5 MPa, the compressive strength ratio can reach 1 / 5 to 1 / 7, the problem that the existing high compressive strength ratio concrete has low bending strength, high cost and poor durability is solved, and the concrete can be widely applied to projects, such as large-span bridges, roads, overload pavements and the like, which have higher requirements on bending strength.

Description

technical field [0001] The invention relates to a high-folding-ratio concrete and a preparation method thereof, in particular to a high-folding-ratio concrete material used for roads and bridges and a preparation method thereof, and belongs to the technical field of concrete material preparation. Background technique [0002] As a brittle material, ordinary concrete has the disadvantages of high brittleness and insufficient toughness, which greatly limits its application range. At present, my country's high-grade roads and bridges have a large traffic flow and require high quality concrete. It not only requires high compressive strength and durability, but also requires concrete to have high flexural strength. At the same time, the national standard also regards the flexural strength of concrete as the key to controlling the quality of high-grade cement concrete pavement, and it needs to reach 5.0MPa or more in 28 days. The 28-day flexural strength is required to be greater...

AI Technical Summary

Problems solved by technology

At present, there are still many defects in the preparation technology of high compressive ratio concrete materials. Most high compressive ratio concretes have problems of poor durability, high cost and poor construction performance.

For the published patented technology, there are two main methods to improve the concrete flexural strength: (1) Increase the concrete flexural strength by adding polymer powder, emulsion and other adhesives. Although this method can significantly improve the concrete Flexural strength, but most polymer adhesives are expensive, greatly increasing engineering costs

In addition, some polymer adhesives have an air-entraining effect, which will lead to a decrease in the compressive strength of the concrete material and poor durability

(2) Improve the flexural strength of concrete by adding an anti-flexural agent with particle dispersion effect, but the results show that this method has a limited effect on improving the flexural strength

Images