摘要
通过对高温后高强矿渣砂浆(HSM)进行裂缝发展观测及抗折和抗压试验,研究了温度和矿渣取代率对HSM细观结构及残余抗折和抗压强度的影响规律。结果表明:20~200℃后,HSM表面未出现裂缝,而400~800℃后,裂缝逐渐发展为网状,HSM变得疏松;20℃时,矿渣取代率越高,HSM的抗折和抗压强度越低;200℃后,HSM的残余抗折强度增大而抗压强度降低;400~800℃后,HSM的残余抗折和抗压强度均随温度升高而降低,其中矿渣取代率为18%的HSM具有最高的残余抗折和抗压强度;根据试验结果,建立了高温后HSM残余抗折和抗压强度的计算式。
The observation of crack development,flexural and compressive tests of high-strength slag mortar(HSM)after elevated temperatures were carried out to study the effects of the temperature and the slag replacement ratio on the meso-structure,the residual flexural and compressive strengths of HSM.The results show that after 20~200℃,there is no crack on the HSM surface,yet after 400~800℃,the crack develops into the net-like structure,and HSM become loose.At 20℃,the higher the slag replacement ratio is,the lower the flexural and compressive strengths of HSM are.After 200℃,the residual flexural strength of HSM increases and the residual compressive strength reduces.After 400~800℃,the residual flexural and compressive strengths of HSM reduce with the increasing temperature,and HSM with slag replacement ratio of 18%has the highest residual flexural and compressive strengths.According to the test results,the equations for calculating the residual flexural and compressive strengths of HSM after elevated temperature are established.
作者
李伟
李志卫
汪家昆
吴相豪
LI Wei;LI Zhiwei;WANG Jiakun;WU Xianghao(College of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 201306,China)
出处
《混凝土》
CAS
北大核心
2021年第5期100-103,118,共5页
Concrete
基金
国家自然科学基金(51608383)。
关键词
高强矿渣砂浆
高温
裂缝发展
残余抗折强度
残余抗压强度
high-strength slag mortar
elevated temperature
crack development
residual flexural strength
residual compressive strength