[1]李晓芬,刘立新..商品混凝土早期时随轴心受拉强度的试验研究[J].郑州大学学报(工学版),2004,25(04):29-32.[doi:10.3969/j.issn.1671-6833.2004.04.008]
　LI Xiaofen,Liu Lixin.Experimental study of axial tensile strength of commercial concrete in the early stage[J].Journal of Zhengzhou University (Engineering Science),2004,25(04):29-32.[doi:10.3969/j.issn.1671-6833.2004.04.008]

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商品混凝土早期时随轴心受拉强度的试验研究()

分享到：

《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:

25

期数:

2004年04期

页码:

29-32

栏目:

出版日期:

1900-01-01

文章信息/Info

Title:

Experimental study of axial tensile strength of commercial concrete in the early stage

作者:

李晓芬; 刘立新.

郑州大学土木工程学院,河南,郑州,450002, 郑州大学土木工程学院,河南,郑州,450002

Author(s):

LI Xiaofen; Liu Lixin

关键词:

商品混凝土;  轴心受拉强度;  时随

Keywords:

commercial concrete;  axial tensile strength;  Whenever it goes

DOI:

10.3969/j.issn.1671-6833.2004.04.008

文献标志码:

A

摘要:

混凝土硬化早期,由于此时混凝土的收缩应变和收缩应力较大,而抗拉强度却相对很低,因此很容易产生非荷载裂缝.为得到较精确的混凝土早期抗拉强度,利用自行设计制作的混凝土轴心受拉试验装置成功地解决了试件对中困难的问题,并对C20、C40、C60 3个强度等级的商品混凝土进行了3 d,7 d,14 d,28 d轴心抗拉强度试验,试验结果均不离散,进而得出了商品混凝土早期轴心抗拉强度随时间变化的规律及其与立方体抗压强度的关系,并对商品混凝土轴心抗拉强度和劈裂强度的关系进行了讨论 ,发现规范中二者之间的换算系数偏与安全.

Abstract:

In the early stage of concrete hardening, non-load cracks are easy to occur because the shrinkage strain and shrinkage stress of concrete are large at this time, but the tensile strength is relatively low. In order to obtain a more accurate early tensile strength of concrete, the self-designed concrete axial tensile test device was used to successfully solve the problem of difficult alignment of specimens, and the axial tensile strength tests of 20 d, 40 d, 60 d and 3 d of C3, C7 and C14 three strength grades of commercial concrete were carried out, and the test results were not discrete, and then the law of the early axial tensile strength of commercial concrete with time and its relationship with the compressive strength of the cube were obtained. The relationship between axial tensile strength and splitting strength of commercial concrete is discussed, and it is found that the conversion coefficient between the two in the specification is biased and safe.

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