复掺硅灰的硫酸钙晶须改性水泥基复合材料的力学性能与微观结构

doi:10.11896/cldb.201902011

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Abstract It is a quite effective method to improve the performance of cement-based composites by restricting the propagation and spread of microcracks. In this study, a new type of microfibrous material, calcium sulfate whiskers (CaSO₄ whiskers) were incorporated in order to enhance the compressive strength and flexual strength of cement mortar. The mechanical properties were tested, and it was found that the addition of CaSO₄ whiskers improved the compressive strength and flexural strength of cement mortar. Scanning electron microscopy observation confirmed that microscopic toughening mechanism of the whiskers mainly involves whisker pullout, crack deflection and whisker bridging, demonstrating the positive effect of an appropriate interfacial bonding strength to achieve full potential of whiskers in cementitious composites. The exothermic peak of cement hydration heat increased significantly after adding silica fume. Exothermic peak appeared in advance, the total heat release increased. Silica fume promoted the formation of C-S-H gel in cementitious composites, showed by thermogravimetric differential scanning calorimetry (TG-DSC) analysis. Further work using the mercury intrusion porosity test confirms the effect on the pore structure and the pore size distribution of cement mortar. It is concluded that silica fume, as a promising supplementary cementitious material, has a great potential for improving the interface between whiskers and cement.

Key words： calcium sulfate whisker silica fume reinforcement mechanical properties microstructure toughening mechanism

Published: 31 January 2019

CLC number:

TQ172

Fund:This work was financially supported by the National Natural Science Foundation of China (51872137).

About author:: Qing Pan, a master of Nanjing Tech University, focusing on the research of nanomaterials and cementitious material.Dongxu Li, a doctoral supervisor of Nanjing Tech University, focusing on the research of alkali activated cementitious material and cement-based composites.

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	PAN Qing
	CHEN Ting
	PAN Ruizhi
	LIU Bao
	LI Dongxu

Cite this article:

PAN Qing,CHEN Ting,PAN Ruizhi, et al. Mechanical Properties and Microstructure of Cementitious Materials Incorporated with Calcium Sulfate Whiskers and Silica Fume[J]. Materials Reports, 2019, 33(2): 257-263.

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http://www.mater-rep.com/EN/10.11896/cldb.201902011 OR http://www.mater-rep.com/EN/Y2019/V33/I2/257

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