碳化硅改性混凝土高温作用后物理力学性能试验研究  

Experimental study on the physical and mechanical properties of silicon carbide modified concrete after high temperature

作　　者：夏伟 赵靖 陈涛 白二雷[1] 黄河 XIA Wei;ZHAO Jing;CHEN Tao;BAI Erlei;HUANG He(Aviation Engineering School,Air Force Engineering University,Xi'an 710038,China;First Engineer Technical Service Brigade of Air Force,Nanjing 211100,China;Faculty of Engineering,Huanghe University of Science and Technology,Zhengzhou 450063,China;Engineering Design and Research Institute of Army Research Institute,Beijing 100043,China)

机构地区：[1]空军工程大学航空工程学院,陕西西安710038 [2]空军第一工兵技术勤务大队,江苏南京211100 [3]黄河科技学院工学部,河南郑州450063 [4]陆军研究院工程设计研究所,北京100043

出　　处：《新型建筑材料》2025年第4期20-24,共5页New Building Materials

基　　金：国家自然科学基金项目(52278287);河南省自然科学基金项目(242300421253)。

摘　　要：通过高温试验和准静态压缩试验,研究了碳化硅改性混凝土从25℃分别升温至200、400、600、800℃恒温3 h时的外观形貌、烧失率及残余抗压强度的变化。结果表明,与普通混凝土试件相比,碳化硅改性混凝土试件的外观形貌较完整,烧失率较小,高温作用后的残余抗压强度较高。碳化硅对混凝土力学性能的提升效果受碳化硅细度的影响较大,当碳化硅细度为400目时,提升效果最优,与碳化硅掺量的关系不明显。综合考虑,碳化硅掺量6%、细度400目为最佳。Through high-temperature tests and quasi-static compression tests,this study investigated the changes in appearance,mass loss rate,and residual compressive strength of silicon carbide-modified concrete when it was heated to 200,400,600,and 800℃ respectively and sintered for 3 h.The results show that compared with ordinary concrete specimens,the silicon carbide-modified concrete specimens exhibited more intact appearance,lower mass loss rate,and higher residual compressive strength after hightemperature exposure.The enhancement effect of silicon carbide on the mechanical properties of concrete is significantly influenced by its fineness but shows no obvious correlation with its content.The optimal improvement is achieved when the silicon carbide fineness is 400 mesh.Comprehensive analysis suggests that the optimal parameters for silicon carbide modification are a content of 6% and a fineness of 400 mesh.

关 键 词：混凝土 碳化硅 高温作用 烧失率 残余抗压强度 

分 类 号：TU528[建筑科学—建筑技术科学]