摘要
为正确评价乌东德大坝低热水泥混凝土的强度性能,在施工现场分春夏秋冬4次浇筑成型低热水泥全级配和湿筛混凝土试件,开展不同龄期混凝土抗压强度、劈拉强度、轴压强度和弹性模量试验研究。根据试验结果,对低热水泥混凝土强度性能的时变特性及全级配和湿筛混凝土强度性能的换算关系展开分析。结果表明,不同季节低热水泥混凝土的抗压和劈拉强度均达到设计强度;365d龄期混凝土强度性能相较于设计龄期仍有明显增长;低热水泥全级配和湿筛混凝土抗压和劈拉强度的换算关系均服从正态分布,具有95%保证率的换算关系分别为0.68和0.62。实际大坝工程,建议根据分析需要选用平均值或95%保证率的比值作为换算关系。
To correctly evaluate the strength properties of low-heat cement concrete of Wudongde dam,the specimens of fully-graded and wet-sieved concrete are casted at the construction site for four times,the tests of compressive strength,splitting tensile strength,axial compressive strength and elastic modulus are performed.According to the test results,an analysis is made on the evolution of the strength properties of low heat cement concrete and the conversion relationship between the strength properties of the fully-graded and wet-sieved concrete.The results show that the compressive strength and splitting tensile strength in different seasons have all reached the design strength.The strength properties of concrete at 365 days is still significantly increased compared with the design age.The conversion relationship between the strength properties of the fully-graded and wet-sieved concrete all follows normal distribution,and the ratios of the compressive and splitting tensile strength of the fully-graded and wet-sieved concrete with 95%guarantee rate are 0.68 and 0.62,respectively.In actual dam projects,it is recommended to select the average value or the ratio with 95%guarantee rate as the conversion relationship.
作者
乔雨
杨宁
牟荣峰
高小峰
陆兴长
李庆斌
QIAO Yu;YANG Ning;MU Rongfeng;GAO Xiaofeng;LU Xingchang;LI Qingbin(China Three Gorges Projects Development Co.,Ltd,Chengdu 610017,Sichuan,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China;College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,Zhejiang,China;Faculty of Electric Power Engineering,Kunming University of Science and Technology,Kunming 650500,Yunnan,China)
出处
《水利水电技术（中英文）》
北大核心
2021年第1期236-247,共12页
Water Resources and Hydropower Engineering
基金
国家自然科学基金项目(51839007,51979145)
中国长江三峡集团有限公司科研项目(BHT/0806,WDD/0427)
清华大学水沙科学与水利水电工程国家重点实验室开放基金(sklhse-2020-C-04)。
关键词
低热水泥混凝土
全级配
湿筛
强度性能
换算关系
low heat cement concrete
full grade
wet-sieved
strength properties
conversion relationship
