Abstract
The accelerated carbonation, natural carbonation, fast freeze-thaw test, and pore structure analysis of C30 and C50 concrete with different proportions of iron tailings powder and slag powder were tested, respectively. The results show that the accelerated carbonation depth and natural carbonation depth of concrete increase with the increase of iron tailings powder content. The prediction model of carbonation depth of iron tailings powder concrete is established by introducing the iron tailings content coefficient and strength influence coefficient. The error between the calculated value of the model and the test value of 28 d curing concrete natural carbonation depth is small, which proves that the model is completely feasible. When iron tailings powder accounts for 50% of mineral admixture, it is helpful to improve the frost resistance of concrete. According to the pore structure analysis, the introduction of iron tailings powder can optimize the pore structure, improve the porosity of harmless and less harmful pores, and thus improve the frost resistance.
Highlights
Tailings are one of the largest solid wastes in the world, which are widely distributed all over the world
Iron tailings are waste residue discharged from iron ore after beneficiation process, but there is still a lot of space for these solid wastes to be utilized [1, 2]. e comprehensive utilization rate of tailings is not high, which is limited by the development of beneficiation technology, the restriction of production equipment, and other scientific and technological factors, so the comprehensive utilization of tailings has become a worldwide problem [3,4,5,6,7]
The frequently used admixtures such as fly ash and slag powder have been in short supply in some areas, which leads to the increase of raw material price and the destruction of market balance
Summary
Tailings are one of the largest solid wastes in the world, which are widely distributed all over the world. Ere are few reports on the long-term carbonation and frost resistance of concrete mixed with iron tailings powder. It is an important premise for the application of iron tailings powder concrete in engineering practice to clarify the influence of iron. Advances in Materials Science and Engineering tailings powder on the long-term carbonation and freezethaw resistance of concrete. The influence of the composite admixture of iron tailings powder and slag powder on the long-term carbonation and rapid freeze-thaw is studied. E long-term carbonation law and model of iron tailings powder concrete are established, and the mechanism of iron tailings powder on the concrete freeze-thaw is revealed, which provides a scientific theoretical basis for the extensive application of iron tailings concrete The influence of the composite admixture of iron tailings powder and slag powder on the long-term carbonation and rapid freeze-thaw is studied. e long-term carbonation law and model of iron tailings powder concrete are established, and the mechanism of iron tailings powder on the concrete freeze-thaw is revealed, which provides a scientific theoretical basis for the extensive application of iron tailings concrete
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