High-strength concrete and preparation method thereof

Abstract

The invention discloses a high-strength concrete and a preparation method thereof. The high-strength concrete is prepared from the following components: mixed sand, cement, coal gangue powder, mineral powder, gravels, water and a compound admixture, wherein the mixed sand is iron tailing sand and natural medium sand, the weight ratio of the iron tailing sand replacing the natural medium sand, namely the percentage of the iron tailing sand taking up the total weight of the mixed sand is 65%-70%, and the fineness modulus of the iron tailing sand is 1.9-2.6. The preparation method comprises the following steps: selecting the fineness modulus according to the analysis on the chemical component and particle size of the iron tailing sand; and preparing the iron tailing sand and the natural medium sand, cement, coal gangue powder, mineral powder, gravels, water and the compound admixture according to the construction mix proportion. By using the concrete, the performance of a concrete mixture can be improved, especially the cohesiveness of the concrete is good, the phenomena of bleeding, dissociation and the like can be reduced, a great amount of iron tailing sand mixed also has no impact on the strength of the concrete and plays a role of comprehensively utilizing iron tailing resources, the environment is protected, and the production cost is lowered.

Description

technical field [0001] The invention relates to concrete, which belongs to the technical field of building materials, in particular to high-strength concrete. The invention also relates to a method for the preparation of said concrete. Background technique [0002] With the rapid development of social modernization, the use of high-strength concrete in the field of construction engineering in my country is becoming wider and wider. However, at present, all the fine aggregates in high-strength concrete are natural medium sand, and the quality and quantity of sand are also highly required. With the continuous mining of a large amount of natural sand, its resources are also facing depletion, so it is necessary to find suitable sand substitute materials. With the rapid development of my country's iron and steel industry, the amount of iron ore mining continues to increase, and the waste slag discharged from the dressing plant is also increasing day by day. After the iron ore ...

AI Technical Summary

Problems solved by technology

In the prior art, the utilization of iron tailings is less, and the discharge of a large amount of iron tailings not only occupies a large amount of land, but also pollutes the environment

The above technology does not provide specific guidance on how the present invention can improve the performance of the concrete mixture, further improve and ensure the strength of concrete, energy saving and environmental protection