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

Highlights

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.

Abstract

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.

Graphical abstract

Keywords

Silicon carbide waste / Cement mortar / Fluidity / Strength / Shrinkage

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Acknowledgements

The authors gratefully acknowledge the financial supports provided by the National Natural Science Foundation of China (Grant Nos. 51678442, 51478348 and 51508404), National High-speed Train Union Fund (No. U1534207), Key project of the Shanghai Committee of Science and Technology (No. 15DZ1205003).

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