常、低温下橡胶集料混凝土抗冲击性能研究

Research on Performance of Crumb Rubber Concrete Under Room and Low Temperature Impact

为了减小强度因素对混凝土材料抗冲击性能的影响,配制了强度等级相同(等强)的素混凝土和橡胶集料混凝土,橡胶的体积掺量分别为5%、10%和15%;同时考虑温度因素的影响,利用本课题组自行设计的U形试件和自主研发的落锤冲击试验装置,分别测试了在常温(25℃)和低温(-20℃)下不同龄期的抗冲击性能。试验结果表明:橡胶集料混凝土的抗冲击次数符合双参数威布尔分布,并且在室温和低温下,橡胶集料混凝土的抗冲击性能均随着橡胶掺量的增加而提高。

In order to reduce the influence of the strength on the impact resistance of concrete mate- rials, this research prepared ordinary concrete and crumb rubber concrete of the same strength grade, with the volume of the rubber content of 5%, 10% and 15% respectively. At the same time, consider- ing the influence of the temperature, using u-shape specimen designed by this research team and a newly designed drop weight impact machine, tests were conducted at room temperature （25 ℃） and low tem- perature （- 20 ℃） under different age of impact resistance. The results show that, the number of the impact resistance of the crumb rubber concrete complies with the theory of double parameters Weibull distribution and linear regression theory, and at both room temperature and low temperature, the resist- ance of crumb rubber concrete increases with the increase of rubber content.