Silicon carbide waste as a source of mixture materials for cement mortar

doi:10.1007/s11783-017-0974-y

Front. Environ. Sci. Eng.

2017, Vol. 11

Issue (5) : 2 https://doi.org/10.1007/s11783-017-0974-y

RESEARCH ARTICLE

Silicon carbide waste as a source of mixture materials for cement mortar

Zhengwu Jiang(

), Qiang Ren, Haoxin Li, Qing Chen

Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, Tongji University, Shanghai 201804, China

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Abstract

SiC waste decreases the fluidity of fresh mortar.

Mortar with SiC waste exhibits lower strength at early ages but higher strength at later ages.

SiC waste decrease the shrinkage rate of cement mortar.

SiC waste has some impacts on the hydration of the cement-SiC waste system.

SiC waste densifies the microstructure of hardened cement paste.

This paper presents an investigation of the feasibility of recycling silicon carbide waste (SCW) as a source of mixture materials in the production of cement mortar. Mortars with SCW were prepared by replacing different amounts of cement with SCW, and the properties of the resulting mortars, such as the fluidity, strength and shrinkage, were studied in this work. Thermogravimetry-differential scanning calorimetry and scanning electron microscopy were employed to understand the reasons for the property changes of the mortars. The results indicate that SCW decreases the initial and 1-h fluidity of fresh mortar but improves the loss of fluidity. The mortar with SCW exhibits a lower strength at 3 d and 7 d but a higher strength at 28 d and 56 d compared to the control. The shrinkage rate of cement mortar with SCW shows an obvious decrease as the replacement ratio increases. In addition, the content of calcium hydroxide in hardened paste also shows that SCW has some impact on the hydration of the cement-SCW system. The microstructures of the hardened paste also show evidence for a later strength change of mortar containing SCW. This work provides a strategic reference for possibly applying SCW as a mixture material in the production of cement mortar.

Keywords Silicon carbide waste Cement mortar Fluidity Strength Shrinkage

Corresponding Author(s): Zhengwu Jiang

Issue Date: 25 July 2017

Cite this article:

Zhengwu Jiang,Qiang Ren,Haoxin Li, et al. Silicon carbide waste as a source of mixture materials for cement mortar[J]. Front. Environ. Sci. Eng., 2017, 11(5): 2.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-017-0974-y
https://academic.hep.com.cn/fese/EN/Y2017/V11/I5/2

Tab.1 Chemical composition of cement (wt%)

Fig.1 Particle size distributions of LS and HS waste

Fig.2 Fluidity values of pastes with SiC waste

Fig.3 SEM images of SiC waste

Fig.4 Strength development in cement mortar with waste

Fig.5 Shrinkage development of cement mortar containing SiC waste

Fig.6 Development of the Ca(OH)₂ content in cement pastes with LS waste

Fig.7 The microstructural morphology of the fractured surface paste at different ages

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