土木与环境工程学报（中英文）2024，Vol.46Issue(5)：175-183,9.DOI:10.11835/j.issn.2096-6717.2023.048
基于RA-AF特征的橡胶自密实混凝土裂缝扩展研究
Study on crack propagation of rubber self-compacting concrete based on RA-AF characteristics
摘要
Abstract
In this paper,in order to explore the fracture propagation mode of rubber self-compacting concrete,combined with RA-AF characteristics and Gaussian mixture model,three-point bending test was carried out on semi-circular bending specimens with prefabricated cracks.Rubber content(0%,10%,20%,30%)and span ratio(0.45,0.54,0.72)were selected as test variables to analyze the crack mode and variation of rubber self-compacting concrete.The results show that when the rubber content is 20%,the rubber self-compacting concrete shows better working performance.With the increase of rubber content,the proportion of tensile cracking AE events increases,indicating that the cracking mode transform into type Ⅰ tensile cracks,and the cracks are continuous.The increase of the span ratio will lead to the decrease of the bearing capacity of the specimen,but the damage degree gradually decreases at the same loading stage,and the fracture mode inside the specimen changes.When the span ratio is 0.54,the specimen shows better working performance.The GMM method shows that the tensile crack AE and the shear crack AE are not simply divided by a straight line,but coexist in some areas.The GMM method can more reasonably describe the variation of the proportion of tensile crack AE events and shear crack AE events under different working conditions.关键词
橡胶自密实混凝土/裂缝模式/半圆盘弯曲试件/声发射技术/高斯混合模型Key words
rubber self-compacting concrete(RSCC)/crack mode/semi-circular bending specimens/acoustic emission/Gaussian mixture model(GMM)分类
建筑与水利引用本文复制引用
石振祥,陈徐东,宁英杰,田华轩..基于RA-AF特征的橡胶自密实混凝土裂缝扩展研究[J].土木与环境工程学报（中英文）,2024,46(5):175-183,9.基金项目
国家重点研发计划(2021YFB2600200) （2021YFB2600200）
国家自然科学基金(51979090) （51979090）
国家重点实验室开放基金(2019CEM002) National Key R&D Program of China(No.2021YFB2600200) （2019CEM002）
National Natural Science Foundation of China(No.51979090) （No.51979090）
Open Foundation of State Key Laboratory of Science and Technology(No.2019CEM002) （No.2019CEM002）
