Iron tailing-desulfurized fly ash-steel slag multi-element system concrete and preparation method thereof

Abstract

The invention discloses iron tailing-desulfurized fly ash-steel slag multi-element system concrete and a preparation method thereof. Each cubic meter of concrete comprises the following raw materials by weight: 180kg of water, 240-260kg of cement, 143-208kg of an iron tailing-based admixture, 720kg of machine-made sand, 1150kg of iron tailing waste rock and 4kg of a water reducing agent, wherein the iron tailing-based admixture is prepared from the components of iron tailings, desulfurized fly ash, steel slag, calcium chloride and silica fume according to a ratio of 2:1:1:1:0.2 in parts by weight. The iron tailing-based admixture is used for replacing part of cement, the use amount of the water-reducing cement is reduced, the machine-made sand and the iron tailing waste rock are used for replacing natural aggregate, the environmental pressure is reduced, the natural resource tension situation is relieved, and the economic cost is greatly saved. The activity of the iron tailings is excited through cascade mechanical activation, the working performance of a mixture and a concrete pore structure are improved, the natural defects of machine-made sand are made up, and economic benefits and environmental benefits are good.

Description

technical field [0001] The invention relates to concrete, in particular to iron tailings-desulfurization ash-steel slag multi-system concrete and a preparation method thereof. Background technique [0002] With the development of modernization, social progress and economic development, mineral resources have been developed to a large extent, which has promoted the prosperity of the country. At the same time, a large amount of tailings waste that is not suitable for sorting and recycling is formed during the utilization of mineral resources, resulting in a great waste of mineral resources and geological environmental problems. Therefore, the resource utilization of tailings is the premise of the green development of mineral resources. With the rapid development of the iron and steel industry, the storage capacity of iron tailings and its growth rate are increasing rapidly, and it has become a solid waste with the largest accumulation but the lowest utilization rate. At pres...

AI Technical Summary

Problems solved by technology

However, the potential volcanic ash excitation efficiency of iron tailings after single mechanical force and chemical activation is low, which cannot meet the needs of concrete admixtures

Moreover, the introduction of a single iron tailings admixture has low activity at the initial stage of the reaction and forms a small amount of hydration products, resulting in increased porosity and low compressive strength, which have a negative impact on the early strength and workability of concrete