水力发电学报2017，Vol.36Issue(8)：104-112,9.DOI:10.11660/slfdxb.20170812
矿物掺和料对自密实混凝土双K断裂参数的影响
Effects of mineral admixtures on double-K fracture parameters of self-compacting concrete
摘要
Abstract
Self-compacting concrete (SCC) is more likely to crack than normal concrete due to its greater content of mineral admixtures.Wedge splitting method was used in this work to conduct fracture tests on 15 sets of SCC specimens and one set of normal concrete specimens,and the fracture behaviors were estimated in terms ofdouble-K fracture parameters.This paper focuses on the influence of various mineral admixtures on SCC fracturing,including cases of fly ash only,fly ash and slag,and fly ash and silica fume.Results showed that in the case with fly ash only,the initial fracture toughness of SCC was decreased with an increase in the admixture content,and its unstable fracture toughness reached the highest at 1.5534 MPa·m1/2 when the fly ash content was 30％.By the tests with two admixtures,total admixture content of 30％ with fly ash-slag proportion of 3:7 was a condition leading to the best fracture property of SCC with an unstable fracture toughness of 1.7122 MPa·m1/2.Doping silica fume was also able to improve the fracture property of SCC.关键词
自密实混凝土/矿物掺和料/断裂性能/楔入劈拉法/双K断裂参数Key words
self-compacting concrete/mineral admixtures/fracture property/wedge splitting method/double-K fracture parameters分类
建筑与水利引用本文复制引用
罗素蓉,林凯斌..矿物掺和料对自密实混凝土双K断裂参数的影响[J].水力发电学报,2017,36(8):104-112,9.基金项目
国家自然科学基金(51378126) （51378126）
