普通混凝土与高强混凝土抗压强度的尺寸效应.pdf

”第16卷第6期
建筑材料学报
Vol. 16, No 6
2013年12月
JOURNAL OF BUILDING MATERIALS
Dec,,2013
文章编号:1007-9629(2013)06-1078-05
普通混凝土与高强混凝土抗压强度的尺寸效应
苏捷,方志
湖南大学土木工程学院,湖南长沙410082)
摘要:通过对27组边长为100,150,200mm,强度等级为C20,C40和C60的普通混凝土和高强混
凝土立方体试件进行抗压试验,系统研究了不同强度等级普通混凝土和高强混凝土试件立方体抗
压强度的尺寸效应,建立了强度等级与立方体抗压强度尺寸效应的关系,得到了普通混凝土和高
强混凝土抗压强度尺寸效应的临界尺寸和临界强度,提出了立方体抗压强度尺寸效应律的计算公
式,并通过试验数据验证了该公式的适用性,试验结果表明:普通混凝土与高强混凝土的立方体抗
压强度均具有较明显的尺寸效应现象,强度等级越高,尺寸效应越明显,C20混凝土立方体抗压强
度尺寸效应度约为C60混疑土的55%
关键词:混凝土;高强混凝土;尺寸效应;强度等级;立方体抗压强度
中图分类号:TU317
文献标志码:A
doi:10.3969/.issn.1007-9629.2013.06.028
Scale Effect on Cubic Compressive Strength of Ordinary
Concrete and High-strength Concrete
Sujie, FANG Zhi
(College of Civil Engineering, Hunan University, Changsha 410082, China)
Abstract: Scale effect of compressive strength of ordinary concrete and high-strength concrete were investi
gated through compression experiments on ordinary concrete and high-strength concrete specimens with
the strength grade of C20, C40 and C60, and the specimen side length of 100, 150, 200 mm. The relation
ship between the strength grade and scale effect was established. Then, the critical size and critical
strength of ordinary concrete and high-strength concrete were obtained. Furthermore, the computational
equations of scale effect were proposed. Finally, good agreements have been found between tested data and
the computational equations. The test and analysis results show that the scale effect exists in the
e cubic
compressive strength of the ordinary concrete and high-strength concrete. With an increase in the strength
grade, the scale effect is significantly enhanced. The scale effect of concrete with strength grade C20 is
55% of the concrete with strength grade C60
Key words; concrete; high-strength concrete; scale effect; strength grade; cubic compressive strengt
混凝土的力学性能不仅与原材料种类和配合比试验结果来反映实际大型工程中材料的真实性能
有关,还与试件的几何尺寸等因素密切相关.在土是土木工程学和材料学的研究热点之一.国内外研
木、水利工程中,由于实际结构尺寸通常较大,受试究者对混凝土抗压强度的尺寸效应已进行了一些研
验条件限制而难以进行工程结构的足尺模型试验,究: Neville3对边长为70~150mm混凝土立方体
通常只能进行缩尺模拟?,因此如何通过缩尺模型试件进行了抗压试验,结果表明大尺寸试件的抗压
收稿日期:2012-11-06;修订口期:2013-09-23
基金项目:国家自然科学基金资助项目(50678063);湖南省科技计划资助项目(2013CK4014);湖南大学“青年教师成长计划
第一作者:苏捷(1979-),男,湖南长沙人,湖南大学讲师,博士.E-mail: ia.msujie(@163.con