STRESS-STRAIN BEHAVIOR OF NORMAL AND HIGH-STRENGTH STEEL-FIBER CONCRETE POST BURNING

被引:0
作者
Purwanto [1 ,2 ]
Antonius [1 ]
Setiyawan, Prabowo [1 ]
机构
[1] Univ Islam Sultan Agung, Civil Engn, Semarang, Indonesia
[2] Univ Semarang, Civil Engn, Semarang, Indonesia
来源
INTERNATIONAL JOURNAL OF GEOMATE | 2021年 / 21卷 / 85期
关键词
Stress; Strain; Steel fiber; Volume fraction; Burning time; REINFORCED-CONCRETE; COMPRESSIVE BEHAVIOR; CURVES;
D O I
10.21660/2021.85.j2211
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This paper presents the results of experimental testing on steel fibrous concrete cylinder specimens after being burned for a certain period of time. The purpose of this research is to explore and develop an analytical expression on the stress-strain behavior of steel-fiber concrete by considering various variables. Precisely, the variables reviewed are the compressive strength of concrete which is defined as concrete with normal-strength, medium-strength and high-strength; the volume of fiber fraction in the concrete, namely 0%, 1% and 2%; and burning time for 1 hour, 2 hours and 3 hours. All cylindrical specimens measuring 100 x 200 mm were tested against uniaxial loads. The experimental results showed that all the fiber-free specimens had experienced a decrease in strength with increasing firing time. Normal-strength concrete specimens lose strength by 30-35% after burning for 1 hour or 2 hours, and the strength degradation increases to 60% at 3 hours after burning. Medium-strength concrete specimens lost 10% strength after being burned for 1 hour , then lost 30% and 60% strength after 2 hours and 3 hours of burning, respectively. High-strength concrete specimens lose 10% strength if burned for 1 hour, then the strength is lost 20% and 55% after burning 2 hours and 3 hours, respectively. Another result is a trend of increasing peak strain of concrete with increasing burning time. In this paper, an analytical expression of stress-strain post-burning steel-fibrous concrete is developed. The comparison results show that the analytical expression is able to predict the experimental results of normal and high-strength steel-fiber concrete with various variations in the volume of the steel fiber fraction effectively.
引用
收藏
页码:61 / 70
页数:10
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