碳化硅晶须对水泥基材料抗拉及断裂性能的影响

摘要/Abstract

摘要： 碳化硅晶须具有高强度、高弹性模量等优良特性。以减水剂作为分散剂制备碳化硅晶须,用来改性水泥基复合材料。通过“8”字模抗拉试验、圆环抗裂试验,以及基于数字图像相关法的预制裂缝三点弯曲试验来测试断裂性能,通过压汞试验研究孔结构,并通过SEM观测碳化硅晶须改性水泥基复合材料微观结构。结果表明,碳化硅晶须能使材料在裂缝扩展时产生裂纹偏转。碳化硅晶须的桥接效应和拔出机制可以有效控制裂纹扩展,增强水泥基材料的抗裂性能和抗拉强度;碳化硅晶须的掺入会使水泥砂浆的总孔隙率略有增加,但对水泥基材料抗拉强度和断裂性能无不利影响。

关键词: 水泥基材料, 碳化硅晶须, 抗拉性能, 断裂性能, 微观结构, 桥接效应

Abstract: Silicon carbide whiskers (SiCw) has many excellent properties such as high strength, high elastic modulus. SiCw was dispersed by using water reducer as dispersant in order to modify cement-based composites. Through 8-shaped method, ring tests of crack resistance, and three-point bending test with pre-cracks based on the digital image correlation method, the fracture properties of materials were measured. The pore structure was studied by mercury intrusion porosimetry and the microstructure was observed by SEM to analyze its enhancement mechanism on cement-based composites. The results show that the SiCw causes crack deflection during crack propagation. By crack path analysis, the crack path of SiCw modified cement-based composites is more tortuous and consumes more energy while crack propagation than the blank group. The incorporation of SiCw helps to improve the brittleness of cement-based composites and provides new ideas for improving the performance of cement-based composites. The SiCw bridging effect and pull-out mechanism effectively control the crack propagation, thus enhancing the crack resistance and the tensile strength of the cement-based materials. From the perspective of pore structure, there is no obvious filling effect after SiCw incorporation. The addition of SiCw increases the total porosity of cement mortar slightly, which has no adverse effect on tensile strength and fracture thoughness.

Key words: cement-based material, silicon carbide whisker, tensile strength, fracture toughness, microstructure, bridging effect

中图分类号:

TU528

韩炎兴, 邵斯杰, 施韬, 蓝滢佳. 碳化硅晶须对水泥基材料抗拉及断裂性能的影响[J]. 硅酸盐通报, 2023, 42(7): 2300-2308.

HAN Yanxing, SHAO Sijie, SHI Tao, LAN Yingjia. Effect of Silicon Carbide Whiskers on Tensile Strength and Fracture Toughness of Cement-Based Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(7): 2300-2308.

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