全级配混凝土强度的尺寸效应研究  

Study of Effecf of Complete Grading Concrete Strength

作　　者：杨忠义[1] 

机构地区：[1]中国水电顾问集团成都勘测设计研究院,四川成都610072

出　　处：《水电站设计》2008年第3期11-14,共4页Design of Hydroelectric Power Station

摘　　要：对溪洛渡与三峡工程全级配及其湿筛混凝土基本力学性能的试验成果,统计计算了相应工程混凝土强度的尺寸效应系数,并从高频振捣对混凝土含气量影响、全级配与其湿筛混凝土中粗骨料-砂浆界面的差异、受压面是否减磨对抗压强度值影响等方面,分析探讨了两工程全级配及其湿筛混凝土抗压强度比值关系问题,合理解释了在较早龄期全级配大试件抗压强度高于湿筛标准试件、并随龄期的增长此比值逐渐减小至小于1的趋势这一规律。In this paper, for the basic mechanical property test results of Xiluodu and Three Gorges Projects complete grading concrete and those of the wet screened specimens of the concrete statistics and calculations of these two kinds concrete strength size factors are carried out, the compressive strength ratio between the complete grading concrete and the wet screened concrete is analysed and probed into for the both projects from the influence of high frequency compaction on the concrete air content, the diffences of the interfaces between the coarse aggregate and motar and the effects of the fact whether the pressured surfaces are reduced and ground on the concrete compressive strength, and reasonable explanation is given to the fact that at the early stage the complete grading concrete has the higher compressive strength than the wet screened specimens,and as the concrete age increases the compressive strength ratio between the two tends to decrease and being less than 1.

关 键 词：全级配砼 湿筛砼 强度 尺寸效应 砼试验 

分 类 号：TV431[水利工程—水工结构工程]