摘要
为研究粉煤灰掺量对工程水泥基复合材料(ECC)力学性能的影响,对4组不同粉煤灰掺量的ECC试件进行了抗压、抗折、四点弯曲的力学性能试验,分析试验结果,得出了粉煤灰掺量对ECC不同力学性能的影响规律,并根据纤维破坏形态解释了ECC抗折性能与弯曲性能的变化规律。试验结果表明:粉煤灰掺量从0增加至65%时,ECC材料抗压强度呈现下降趋势,抗折强度先增后减,在45%掺量时达到最大值,纤维破坏形态由“拔断”向“拔出”过渡,弯曲性能在粉煤灰掺量达到45%后表现优异,且纤维大多呈现“滑移硬化”破坏。研究结果可为优化ECC配合比提供指导。
In order to study the influence of fly ash content on mechanical properties of engineered cementitious composites(ECC),four groups of ECC specimens with different fly ash content were tested for compressive, flexural and four-point bending mechanical properties.The test results were analyzed and the influence rule of fly ash content on different mechanical properties of ECC was obtained.The flexural resistance and bending performance of ECC were explained from the fiber failure pattern.Test results show that the fly ash content increased from 0 to 65%, the compressive strength of ECC materials shows a downward trend, the flexural strength increases first and then decreases,reaching the maximum value when the fly ash content is 45%.The fiber failure pattern transitions from “pull off” to“pull out”.The bending performance is excellentwhen the fly ash content reaches 45%, andmost of the fibers show “sliding hardening” damage.The results can provide guidance for ECC mix optimization.
作者
乔思皓
薛婉文
吴绍奇
赵飞洋
郝瑞卿
廖霖
QIAO Sihao;XUE Wanwen;WU Shaoqi;ZHAO Feiyang;HAO Ruiqing;LIAO Lin(College of Mining Eninering,Taiyuan University of Technology,Taiyuan 030024,Chine)
出处
《混凝土》
CAS
北大核心
2022年第8期82-86,91,共6页
Concrete
基金
国家自然科学基金(51604183)
山西省青年科技研究基金(201703D1110207,201901D211109)
山西省回国留学人员科研资助项目(2021-041)
中国博士后科学基金面上资助项目(2020M670697)。
关键词
ECC
粉煤灰掺量
抗压强度
抗折强度
弯曲性能
纤维破坏形态
ECC
fly ash content
compressive strength
flexural strength
the bending performance
fiber failure pattern
