Experimental Research on Elastic Modulus and Compressive Strength of High-Strength Concrete after Fire

Abstract:

The bottom surface of the bridge beam, which is made of C50 high-strength concrete, is heated to 800°C in fire-resistant experiment. Then the elastic modulus and strength of the concrete are measured by the rebound method and core sampling method, and the test results are used to validate the theoretical methods. The study shows that the strength and elastic modulus of concrete decrease with the increasing of temperature. The strength from the current theoretical analysis agrees well with that from the experiment. But for the elastic modulus, there is a great difference between the theoretical and experimental analysis. The strength of the concrete after fire gotten from the rebound method has a bigger error than that from the core sampling method, so that the core sampling method should be used in preference.

• Periodical: Advanced Materials Research (Volume 663)
• Pages: 144-148
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.663.144
• Online since: February 2013
• Authors: Xin Lei Shi, Yong Ding, Zhi Kun Yao, Li Ping Zhou
• Keywords: After Fire, Compressive Strength, Concrete, Elastic Modulus, Experimental Research

References

[1] M. S. Abrams, Compressive Strength of Concrete at Temperatures to l600F, Special Publications, Detroit, (1971).

[2] Li Guhua, Feng Linyun, Zhen Shenge, Research of concrete and its material performance after fire, Sichuan Institute of Building Research. 2 (1991) 1-5.

[3] Xiao Han, Ding Yong, Wang Xintang, Tang Jiashi, Simulation of Fire in the Space under Bridge, Multimedia Technology (ICMT), 2 (2011).

DOI: 10.1109/icmt.2011.6003123

[4] China State Construction: Technical Specification for Inspection of Concrete Compressive Strength by Rebound Method(JGJ/T 23-2001).

[5] China Academy of Building Research: Technical Specification for Testing Concrete Strength with Driller Core(CECS03: 2007).

[6] Wu Bo, Ma Zhongcheng, Ou Jinping, Experimental research on deformation and constitutive relationship of concrete after high temperature, Journal of building structures. 20 (1999) 42-49.

[7] Wu Bo, Yuan Jie, Wang Guangyuan, Experimental research on the mechanical properties of HSC after high temperature, China Civil Engineering Journal 33 (2000) 8-12.

[8] Chen Weiqi: The Study on the Temperature Field and Mechanical Behavior of The simple-supported Concrete Girder Bridge Under Fire. Master degree thesis of Ningbo university, (2011).