锦屏一级拱坝混凝土全级配与湿筛试验分析  

Analysis on Full-Graded and Wet-Screened Tests for Jinping I Arch Dam Concrete

作　　者：唐天国[1,2] 段绍辉[2] 段云岭[3] 

机构地区：[1]四川大学建筑与环境学院,四川成都610065 [2]二滩水电开发有限责任公司,四川成都610051 [3]清华大学水利水电工程系,北京100084

出　　处：《人民黄河》2012年第1期111-112,119,共3页Yellow River

基　　金：二滩水电开发有限责任公司合同资助项目(EHDCA-201007)

摘　　要：水工大坝混凝土力学特性试验迄今仍采用湿筛成型小尺寸试件进行,而湿筛试验过程中往往剔除大于40 mm大骨料,造成试验结果无法真实反映实际大坝混凝土的性能指标。结合锦屏一级高拱坝混凝土强度测试要求,开展其单轴抗压、单轴抗拉、极限拉伸及弹性模量等指标的全级配试验,并与湿筛试验进行对比。结果表明:在尺寸效应和骨料湿筛效应的影响下,大骨料混凝土全级配试件28 d以上龄期的强度和变形均比湿筛小骨料试件相应龄期的强度和变形小。Mechanical tests of dam concrete are still from wet-screened tests for small-scaled samples.But wet-screened experiments are often picked out large aggregates above 40 mm.Wet-screened results must be different from concrete＇s full-graded tests.So wet-screened tests not exactly reflect mechanical performance of dam＇s concrete.Based on demand of concrete＇s design strength of Jinping I Arch Dam,full-graded tests from uniaxial compression,tension,limit tension and elastic modular were completed.It shows that large aggregates concrete suffers from size＇s and wet-screened effect,large aggregates concrete＇s strength and deformation are both less than those from wet-screened tests at 28 days age.

关 键 词：全级配试验 湿筛试验 抗拉强度 极限拉伸 锦屏一级拱坝 

分 类 号：TV431[水利工程—水工结构工程]