Mitigating drying shrinkage and enhancing mechanical strength of fly ash-based geopolymer paste with functionalized MWCNTs grafted with silane coupling agent

Li, Faping; Chen, Qianshi; Lu, Yiyan; Zou, Yunlong; Li, Shan

doi:10.1016/j.cemconcomp.2023.105250

Cited by 16 publications

(1 citation statement)

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“…In order to realize the direct application of super standard mica sand in engineering, the first task is to solve the influence of the high mica content in sand on the strength of cement-based materials. According to the literature [23,[44][45][46] and engineering practice, the optimal selection of the SCA, AA, and HPMC super standard mica sand interface modifier was carried out, and the optimal dosage was determined. The optimization results of the modifier varieties and modifier contents are shown in Figure 5 and Figure 6, respectively.…”

Section: Effect Of Interfacial Modifier On Strength Of Mortarmentioning

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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Section: Effect Of Interfacial Modifier On Strength Of Mortarmentioning

confidence: 99%