Determination of Fracture Energy of Early Age Concrete through a Uniaxial Tensile Test on an Un-Notched Specimen

被引：5

作者：

Ren, Dongya ^{[1
,2
]}

Houben, Lambert ^{[3
]}

机构：

[1] Southwest Jiaotong Univ, Sch Civil Engn, Chengdu 610031, Peoples R China

[2] Southwest Jiaotong Univ, Highway Engn Key Lab Sichuan Prov, Chengdu 610031, Peoples R China

[3] Delft Univ Technol, Fac Civil Engn & Geosci, NL-2628 CN Delft, Netherlands

来源：

MATERIALS | 2020年 / 13卷 / 03期

基金：

中国国家自然科学基金;

关键词：

early age concrete; fracture energy; uniaxial tensile test; un-notched specimen; 3-POINT BEND TESTS; TOUGHNESS; LENGTH;

D O I：

10.3390/ma13030496

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Unlike the notched specimens for conventional concrete fracture tests, this paper introduces a deformation-controlled uniaxial tensile test on an un-notched specimen. The surface of the dog bone-shaped specimen is a second order parabolic curve, and the gradual change in the specimen shape does not lead to extreme stress concentrations. Another significant feature of the tension test set-up is that it is built with three hinges, to accommodate the alignment of the specimens. The specimen preparation, test conditions, and the tension test set-up are explained in detail. The fracture energy of the concrete is determined by the obtained complete softening curves. The fracture energy is found to increase with age, going towards a horizontal asymptote as concrete hardened in a tested age range of 1 day to 90 days. Moreover, the rate of development of the fracture energy was found to be higher when compared to tensile strength and stiffness.

引用

页数：15

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