Improving mechanical properties of manufactured sand concrete with high biotite content: Application of magnetic separation process and equipment optimization

Xue, Hui-lin; Han, Chao-qiang; Chen, Mingliang; Fan, Gang; Zhou, Jia‐wen

doi:10.1016/j.conbuildmat.2022.128861

Cited by 7 publications

(1 citation statement)

References 35 publications

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“…Mica is a significant mineral that forms rocks. Due to the special development of mica layers, the mica is often separated from rocks in the form of plates, sheets, and columns during the process of sand making [3][4][5]. Sand with high mica content has flaking characteristics and a smooth surface, which means that it increases the water consumption of mortar or concrete, resulting in lower strength and insufficient durability [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Interfacial Modification on the Properties of Super Standard Mica Sand Cement-Based Materials

Liu,

Yang,

Jiang

et al. 2024

Buildings

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Mica is a harmful substance in sand and occurs frequently. The application of super standard mica sand is a difficult problem in large-scale engineering. In this work, the effects of an interface modifier, mineral admixture, and a curing system on the properties of cement-based materials with super standard mica sand were studied. The strength of cement-based materials linearly decreases with the mica content in sand. When the mica content in sand exceeds 6%, the compressive strength of mortar and concrete at 28 d decreases by more than 22.3% and 33.5%, respectively. By adding the silane coupling agent (SCA) of 50% mica mass and curing in natural conditions, the compressive strength of mortar increases by 10.9%. The cement-based materials with the SCA are more suitable for curing in natural conditions, and the performance of the SCA will not be affected by adding appropriate amounts of mineral admixture. The drying shrinkage strain of the concrete, with the sand containing high mica content modified by SCA, is reduced by 10.5%, and the diffusion of chloride ions in concrete is reduced. The XRD results show that the addition of the interfacial agent does not change the hydration products. The MIP and SEM results show that the SCA can form a bridge structure between the hydration products and the mica, improve the bonding strength of the interface zone, and reduce the number of harmful pores.

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