摘要
采用棱柱体试件,研究冻融后应变硬化水泥基复合材料(SHCC)单轴压缩性能,分析冻融循环对其相对动弹性模量、质量、破坏模式、抗压强度及应力应变曲线的影响。结合电镜扫描结果,从微观揭示其劣化机理。结果表明:随着冻融循环次数增加,试件内部微结构逐步劣化,相对动弹性模量和抗压强度明显降低,单轴压应力应变曲线斜率逐渐减小,峰值应变则逐步增大。提出的冻融损伤模型具有较高拟合精度,能较好反映SHCC冻融损伤演化规律。
Investigations on the uniaxial compressive behaviors of strain hardening cementitious composites(SHCC)after freezing and thawing cycle were carried out in this research with the prism specimens.The relative dynamic elastic modulus,mass loss rate,uniaxial compressive strength,failure mode and stress-strain curves under uniaxial compression were determined for SHCC exposed different freeze-thaw loading cycles.Scanning electron microscope(SEM)was used to analyze the degradation mechanism of SHCC.The experimental results indicated that with the increase of the number ofthe freezing-thawing cycles,the internal microstructure of SHCC deteriorated gradually,the relative dynamic elastic modulus,the uniaxial compressive strength and the slope of stress-strain curves under uniaxial compression showed downward trends,while the peak strain gradually increased.Finally,an onlinear freeze-thaw damage model was proposed based on the experimental results,which had high precision to evaluate the damage evolution of SHCC exposed to freezing-thawing environment.
作者
赵军
蒋祖发
温金鑫
周甲佳
张丽娟
ZHAO Jun;JIANG Zufa;WEN Jinxin;ZHOU Jiajia;ZHANG Lijuan(School of Mechanics and Safety Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《混凝土》
CAS
北大核心
2022年第3期1-5,共5页
Concrete
基金
基金资助:国家自然科学基金青年基金项目(51708510)
中原千人计划-中原科技创新领军人才项目(ZYQR201912029)
河南省高校科技创新团队支持计划(20IRTSTHN009)
河南省高等学校重点科研计划项目(17A560027)。
关键词
SHCC
冻融循环
力学性能
微观结构
损伤模型
SHCC
freezing-thawing cycle
mechanical property
microstructure
damage model