橡胶混凝土断裂韧性试验研究

引用文献:

薛刚 董亚杰 衣笑 高鹏. 橡胶混凝土断裂韧性试验研究[J]. 建筑结构,2022,48(02):115-119,126.

XUE Gang DONG Yajie YI Xiao GAO Peng. Experimental study on fracture toughness of rubber concrete[J]. Building Structure,2022,48(02):115-119,126.

作者:薛刚 董亚杰 衣笑 高鹏
单位:内蒙古科技大学土木工程学院
摘要:为研究橡胶混凝土断裂韧度,以C30混凝土为基准混凝土,将橡胶颗粒的粒径、掺量以及试件的缝高比作为变量,制备混凝土试件进行楔入劈拉试验研究。计算得到橡胶混凝土试件起裂韧度及失稳断裂韧度的变化规律。结果表明:掺入橡胶后,混凝土的起裂韧度有明显降低,橡胶掺量越高降幅越明显,橡胶掺量为5%~15%的混凝土失稳断裂韧度大于基准混凝土;20%橡胶掺量的混凝土失稳断裂韧度略小于基准混凝土;缝高比相同时,掺粒径为0.3mm橡胶颗粒的混凝土试件失稳断裂韧度高于粒径为0.6mm的橡胶混凝土,表现出更好的断裂韧性;与起裂韧度相比,失稳断裂韧度与橡胶含量的非线性特征更加明显。
关键词:楔入劈拉,橡胶混凝土,起裂韧度,失稳断裂韧度
作者简介:薛刚,博士,教授,硕士生导师,主要从事新型混凝土材料与结构研究,Email:xuegang-2008@126.com。董亚杰,硕士研究生,主要从事橡胶混凝土力学性能研究,Email:511057907@qq.com。
基金:国家自然科学基金项目(51868063)。
尊敬的用户,本篇文章需要2元,点击支付交费后阅读
参考文献[1] 陈爱玖,韩小燕,汪志昊,等.改性橡胶混凝土力学性能试验研究[J].混凝土,2018(5):91-93,97.
[2] YOUSSF O,MILLS J E,BENN T,et al.Development of crumb rubber concrete for practical application in the residential construction sector-design and processing[J].Construction and Building Materials,2020,260:119813.
[3] 李厚民,陶丽梅,舒展.橡胶混凝土在钢筋混凝土框架结构中的应用[J].建筑结构,2019,49(23):123-126.
[4] 王大辉,袁群,史长城,等.改性橡胶混凝土在赵口灌区渠道衬砌中的应用[J].人民黄河,2018,40(3):123-125,131.
[5] 覃峰,马福荣,杨胜坚,等.橡胶粉改性水泥混凝土路面试验路段的应用研究[J].公路,2010,55(11):95-101.
[6] 潘家铮.断裂力学在水工结构设计中的应用[J].水利学报,1980,11(1):45-59.
[7] 徐世烺.混凝土断裂机理[M].大连:大连理工大学出版社,1988.
[8] 徐世烺,喻常雄,张滇军.利用导电性能确定接缝灌浆材料Ⅱ型断裂临界荷载[J].大连理工大学学报,2008,48(4):546-550.
[9] 胡少伟,谢建锋.不同尺寸混凝土楔入劈拉试件双K断裂韧度试验研究与理论分析[J].华北水利水电大学学报(自然科学版),2014,35(4):43-47.
[10] 宗义.全配级混凝土断裂劈拉试验研究[D].昆明:昆明理工大学,2018.
[11] 水工混凝土断裂试验规程:DL/T 5332—2005[S].北京:中国电力出版社,2006.
Experimental study on fracture toughness of rubber concrete
XUE Gang DONG Yajie YI Xiao GAO Peng
(School of Civil Engineering, Inner Mongolia University of Science and Technology)
Abstract: In order to study the fracture toughness of rubber concrete, based on C30 concrete the particle size, content of rubber powder and the joint height ratio of the specimens were used as variables to prepare concrete specimens for wedge split tensile test. The changing rules of the initial fracture toughness and the unstable fracture toughness of the rubber concrete specimens were obtained. The results show that the initial fracture toughness of concrete decreases obviously after adding rubber, and the larger the rubber content is, the more obvious the decrease range is. The instability fracture toughness of rubber concrete with 5%~15% content is higher than that of reference concrete, and the instability fracture toughness of rubber concrete with 20% content is slightly lower than that of reference concrete. At the same joint height ratio, the instability fracture toughness of concrete specimens with a particle size of 0.3 mm is higher than that of the particle size of 0.6 mm, showing better fracture toughness. Compared with the initial fracture toughness, the nonlinear characteristics of instability fracture toughness and rubber content are more obvious.
Keywords: wedge splitting and pulling; rubber concrete; initiation fracture toughness; instability fracture toughness
505 0 0
文字:     A-     A+     默认 取消