超高强混凝土RPC强度的尺寸效应
Size Effect on Strength of Ultra-high Strength Concrete RPC
刘数华 1阎培渝 2冯建文2
作者信息
- 1. 武汉大学水资源与水电工程科学国家重点实验室,武汉市,430072
- 2. 清华大学土木工程系,北京市,100084
- 折叠
摘要
活性粉末混凝土(RPC)是一种新型超高强水泥浆复合材料,具有优异的力学性能和耐久性.为了能够更好地应用于结构工程,对超高强混凝土RPC试件强度的尺寸效应进行试验研究和机理分析.研究结果表明:以4cm立方体试件抗压强度为基准.对于10cm立方体试件,150 MPa级和200 MPa级的尺寸换算系数分别为0.81和0.76;对于10cm×10 cm×30 cm棱柱体,150 MPa级和200 MPa级的尺寸换算系数分别为0.71和0.63;随着基准抗压强度的增大.尺寸效应换算系数有减小的趋势,即大尺寸试件的抗压强度较小.RPC是一种典型的弹脆性材料.材料开裂后裂纹很快失稳扩展,损伤集中在局部区域,因而尺寸效应更明显.
Abstract
++Reactive Powder Concrete (RPC)is a new kind of ultra-high strength cement based composite with excellent mechanics performance and durability. In order to make RPC used in structural engineering effectively,size effect on strength of the ultra high strength concrete RPC specimen is experimental studied and the mechanism is analyzed in this paper. Test results show that if the 4 cm cube compressive strength is the control strength,conversion coefficients of 10 cm cube compressive strength at 150 MPa and 200 MPa grade are 0.81 and 0.76 respectively; conversion coefficients of 10 cm× 10 cm× 30 cm prism compressive strength at 150 MPa and 200 MPa grade are 0.71 and 0. 63 respectively; the size effect conversion coefficient tends to decrease with the increase of control strength, the larger the specimen size, the lower the compressive strength. RPC is a typical brittle material. It extends instability quickly after cracking;damage concentrated in the local area,and therefore appears higher size effect.
关键词
活性粉末混凝土/尺寸效应/抗压强度/抗折强度/机理分析Key words
reactive powder concrete/size effect/compressive strength/flexural strength/mechaqnism analysis引用本文复制引用
基金项目
国家科技支撑计划(2008BAE61B05)
出版年
2011
NETL
NSTL
维普
万方数据