长江科学院院报2019，Vol.36Issue(2)：139-143,5.DOI:10.11988/ckyyb.20170811
龄期对碾压混凝土双K断裂参数影响的试验研究
Influence of Age on Double-K Fracture Parameters of Roller Compacted Concrete
摘要
Abstract
The influence of age on Double-K fracture parameters of roller-compacted concrete ( RCC) was investiga-ted via fracture test on eighteen RCC wedge splitting specimens at different ages (28 d, 60 d, and 90 d). The ef-fective crack length, initial fracture toughness and unstable fracture toughness of the RCC specimens of different a-ges were acquired. Results revealed that with the growth of age, the critical pressure for initial cracking and critical pressure for instability both expanded, and the ratio of critical pressure for initial cracking to critical pressure for in-stability also increased. With the age increasing from 28 d to 90 d, initial cracking toughness KiniIC and unstable cracking toughness KunIC climbed by 0.216 0 MPa·m1/2 and 0.292 2 MPa·m1/2, respectively; the ratio of KiniIC to KunIC maintained between 0. 5 and 0. 6 in general. Effective critical cracking length and subcritical crack extension both changed in a negative relation with age, implying that smaller age results in better toughness of specimens.关键词
碾压混凝土/双K断裂理论/龄期/楔入劈拉试验/断裂韧度Key words
roller-compacted concrete/double-K fracture parameters/age/wedge splitting test/fracture toughness分类
建筑与水利引用本文复制引用
李根,王学志,张晓飞,陈意勤,胡柯心,李春蕊..龄期对碾压混凝土双K断裂参数影响的试验研究[J].长江科学院院报,2019,36(2):139-143,5.基金项目
国家自然科学基金面上项目(51479168) （51479168）
辽宁省自然科学基金项目(2015020214) （2015020214）
