Abstract
Recently, the use of sustainable materials has gained increasing attention and recognition, especially in the construction industry. As the main component of concrete, ordinary Portland cement (OPC) is undoubtedly one of the most commonly used building materials in the world. However, the manufacture of OPC is accompanied by environmental and ecological problems such as the release of carbon dioxide. According to estimates, about 5%-8% of the world think that carbon dioxide emissions come from the OPC industry, so it is urgent to use fly ash, tailings, slag and other industrial solid waste to produce cement instead of ordinary Portland cement.This article summarizes the achievements of the predecessors and outlines the influence of different iron tailings and iron tailings content on the mechanical properties and durability of concrete.
Highlights
Iron tailings are wastes eliminated during beneficiation and are an important part of industrial solid waste
The results show that the compressive strength of concrete tends to decrease first and increase when the content of coarse aggregate is less than 30%; When the coarse aggregate content reaches 30%, the compressive strength reaches the maximum value of 38.34MPa
The design-expert software was used to analyze the mix ratio.The final result shows that the concrete made by using iron tailings instead of silica fume and quartz; among them, the water-binder ratio and gradation are the main factors affecting the compressive strength of concrete, and the factors that have the greatest influence on the flexural strength are the amount of steel fiber and pulverized coal Ash grinding time
Summary
Iron tailings are wastes eliminated during beneficiation and are an important part of industrial solid waste. There are not too many ways to use iron tailings, only a l arge amount of accumulation. We should find ways to use these discarded iron tailings to make concrete, which can solve a series of problems caused by the accumulation of iron tailings, and meet the needs of building structures for concrete. The advantages of this material are high strength, strong acid resistance, large consumption of hazardous solid waste and greatly reduce greenhouse gas emissions. The article summarizes the method of preparing concrete with a large amount of iron tailings and the influence of iron tailings on the strength and durability of concrete
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