铁道科学与工程学报2018，Vol.15Issue(4)：887-892,6.
C50大体积混凝土温度应力测试及抗裂性能研究
Temperature stress test and anti-crack properties of C50 massive concrete
摘要
Abstract
In order to study the early change of temperature and stress of high strength massive concrete with different mixtures and methods of anti-crack, test specimens of size 6.5 m×2.0 m×4.5 m were used and temperature and stress sensors were embedded. The specimens were made of design strength grade C50 concrete with addition of 15% fly ash and 33% mineral admixtures of fly ash and slog, respectively. Results show that compressive strength of these two kinds of concrete are beyond 80% of design strength grade and split tensile strength is also more than 2.6 MPa at 3 d ages. The improvement of early tensile strength of concrete is beneficial for anti-crack. Both the biggest temperature difference and the biggest tensile strength appear between 3 d and 4 d ages. Addition more than 30% mineral admixtures composed by fly ash slag into massive concrete can decrease temperature difference and keep high tensile strength, which is helpful for improving anti-crack properties of massive concrete.关键词
大体积混凝土/水化热/应力/温度Key words
massive concrete/hydration heat/stress/temperature分类
交通工程引用本文复制引用
杨鹰,盛兴旺,马昆林..C50大体积混凝土温度应力测试及抗裂性能研究[J].铁道科学与工程学报,2018,15(4):887-892,6.基金项目
国家重点研发计划资助项目(2017YFB1201204) （2017YFB1201204）
中铁二十四局科研资助项目(2018-1) （2018-1）
