摘要
采用稻壳灰为主要胶凝材料并掺入橡胶颗粒作为人工缺陷,制备低碳环保型的高延性水泥基复合材料(Rice husk ash and crumb rubbers engineered cementitious composites,CR-RHA/ECC)。通过宏观力学性能与微观实验,研究不同养护龄期下(7天和28天)橡胶掺入量(0、10%、20%、30%)对CR-RHA/ECC延性和开裂特性的影响。结果表明:随着龄期的增长,CR-RHA/ECC的延性存在较大差异,橡胶替代10%河砂使CR-RHA/ECC的7天龄期延性削弱了54%,而使CR-RHA/ECC的28天龄期增长了67%,随着龄期增长(28天龄期),橡胶替代30%河砂可使CR-RHA/ECC的延性达6%,此时CR-RHA/ECC相较于无橡胶替代河砂组,CR-RHA/ECC的拉伸裂缝宽度减小了52.79%。
Rice husk ash is the primary supplementary cementitious material,with rubber particles injected as artificial flaws.Rice husk ash and crumb rubbers engineered cementitious composites(CR-RHA/ECC)are low carbon,ecologically friendly cementitious composites with good ductility.The effects of rubber content(0,10%,20%,30%)on the ductility and cracking characteristics of CR-RHA/ECC at each curing ages(7 days and 28 days)were explored employing macroscopic mechanical properties and microscopic investigations.The results show that:With the increase of age,there is a great difference in the ductility of CR-RHA/ECC.The replacement of 10%river sand by CR weakens the ductility of CR-RHA/ECC at 7 days by 54%and increases the ductility of CR-RHA/ECC at 28 days by 67%.With the increase of age(28 days),When CR replaces 30%river sand,the ductility of CR-RHA/ECC can reach 6%,and the tensile fracture width of CR-RHA/ECC decreases by 52.79%compared with that of CR-RHA/ECC without CR replacement.
作者
滕晓丹
黎永鸿
韦宵宁
周俊杰
TENG Xiaodan;LI Yonghong;WEI Xiaoning;ZHOU Junjie(School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi Key Laboratory of Disaster Prevention and Engineering Safety,Guangxi University,Nanning 530004,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2024年第7期3716-3725,共10页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(11962001)
广西自然科学基金项目(2023GXNSFBA026268)。
关键词
高延性水泥基复合材料
稻壳灰
橡胶
延性
裂缝宽度
high ductility cementitious composites
rice husk ash
crumb rubber
ductility
crack wide
