橡胶颗粒和稻壳灰复掺改性ECC拉压性能与裂缝特征
Tensile and compressive properties and crack characteristics of rice husk ash and crumb rubber particles modified engineered cementitious composites
滕晓丹 1黎永鸿 2韦宵宁 2周俊杰2
作者信息
- 1. 广西大学 土木建筑工程学院,南宁 530004;广西大学 广西防灾减灾与工程安全重点实验室,工程防灾与结构安全教育部重点实验室,南宁 530004
- 2. 广西大学 土木建筑工程学院,南宁 530004
- 折叠
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%.
Abstract
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.
关键词
高延性水泥基复合材料/稻壳灰/橡胶/延性/裂缝宽度Key words
high ductility cementitious composites/rice husk ash/crumb rubber/ductility/crack wide引用本文复制引用
基金项目
国家自然科学基金(11962001)
广西自然科学基金项目(2023GXNSFBA026268)
出版年
2024
NETL
NSTL
万方数据