碳酸钙晶须增强水泥基复合材料压缩性能随温度的变化规律  

Variation of compressive properties of calcium carbonate whisker reinforced cement-based compositesexposed to high temperature

作　　者：张毅 吴立山 余志辉 张聪[1,2] ZHANG Yi;WU Lishan;YU Zhihui;ZHANG Cong(College of Environmental and Civil Engineering,Jiangnan University,Wuxi 214000,China;Jiangsu Key Laboratory of Environmental Disaster and Structural Reliability inCivil Engineering,Xuzhou 221000,China)

机构地区：[1]江南大学,环境与土木工程学院,江苏无锡214000 [2]江苏省土木工程环境灾变与结构可靠性重点实验室,江苏徐州221000

出　　处：《功能材料》2022年第12期12110-12115,共6页Journal of Functional Materials

基　　金：国家自然科学基金项目(51908247);江苏省土木工程环境灾变与结构可靠性重点实验室开放基金项目(KFJJ202007)。

摘　　要：碳酸钙晶须可以有效改善水泥基复合材料在常温下的压缩性能,但是高温作用后碳酸钙晶须对材料压缩性能的影响尚不清楚。研究了不同体积掺量(0%、0.5%、1%、2%)的碳酸钙晶须增强水泥基复合材料分别在常温以及200,400,600和800℃高温作用后的压缩性能。试验结果表明,常温下随着晶须掺量的提高,试件的抗压强度和压缩韧性呈先上升后下降的趋势,其中掺入1%碳酸钙晶须的材料压缩性能最好。200℃条件下材料的抗压强度和压缩韧性较常温均有明显提高,而当目标温度超过200℃后,高温对材料的压缩性能劣化作用明显,其抗压强度和压缩韧性持续衰减,800℃作用后各组的压缩性能已没有明显差距,但在每个目标温度作用下,碳酸钙晶须均可以提高高温作用后的抗压强度值和压缩韧性值,说明碳酸钙晶须的掺入对提高材料在高温作用后的压缩性能有积极作用。Calcium carbonate whiskers can effectively improve the compressive properties of cement-based composites at room temperature,but the effect of calcium carbonate whiskers on the compressive properties of cement-based composites after high temperature is not clear.In this paper,the compressive properties of calcium carbonate whisker reinforced cement-based composites with different volume contents(0%,0.5%,1%,2%)were studied at room temperature and 200,400,600 and 800℃respectively.The test results show that the compressive strength and compressive toughness of the specimens increase first and then decrease with the increase of whisker content at room temperature,and the compressive performance of the material mixed with 1%calcium carbonate whisker is the best.The compressive strength and compressive toughness of the material at 200℃are significantly higher than those at room temperature.When the target temperature exceeds 200℃,the high temperature has an obvious deterioration on the compressive performance of the material,and its compressive strength and compressive toughness continue declining.There is no obvious difference in the compressive performance of each group after 800℃,but under each target temperature,calcium carbonate whisker can improve the compressive strength and compressive toughness after high temperature.It shows that the addition of calcium carbonate whisker plays a positive role in improving the compressive properties of the material after high temperature.

关 键 词：碳酸钙晶须 高温 压缩性能 水泥基复合材料 

分 类 号：TU502[建筑科学—建筑技术科学]