Study on Fire Resistant Performance of Recycled Concrete Tubular Structures

Abstract:

In order to achieve the fire resistance performance of recycled concrete, four concrete tubular structure specimens were designed and tested under the high temperature. One of the specimens was made from normal concrete C20, one was made from recycled coarse aggregate concrete C20, and two were made from recycled coarse and fine aggregate concrete C20 and C40 respectively. The temperature field, the vertical displacement, the wall deflection and the fire endurance were comparatively analyzed. Results show that the rate of temperature increasing inside the concrete becomes smaller with the increase of recycled aggregate replacement rate. The temperature of specimens with recycled concrete is lower than that with normal concrete at the same position, the same force condition and the same fire condition. The load carrying capacity of specimens with recycled concrete is lower than that of the normal concrete specimen due to the bigger porosity of recycled concrete. The fire endurance decreases with the increase of recycled aggregate replacement rate in the specimens. With the increase of the strength of recycled concrete, fire resistance and fire endurance of the tubular structure decrease and the structure tends to fail in expansion under high temperature.

• Periodical: Applied Mechanics and Materials (Volumes 256-259)
• Pages: 2781-2785
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.256-259.2781
• Online since: December 2012
• Authors: Hong Ying Dong, Wan Lin Cao, Jian Wei Zhang
• Keywords: Fire Endurance, Fire Resistance Experiment, Recycled Concrete (RC), Temperature Field, Tubular Structure

References

[1] T Hareda. Strength, Elasticity and Thermal Properties of Concrete Subject to Elevated to Temperature, Concrete for Nuclear Reactors, ACI SP-34,Detroit,1972.

[2] Linhai Han. The theoretical calculations on fire resistance of steel concrete column [J]. Journal of Harbin University of C. E. &Architecture, Vol. 31(1)( 1998), pp.26-30. (in Chinese)

[3] R Ongah, P A Mendis, J G Sanjayan. Fire performance of high strength reinforced concrete walls [C], Proceedings of 17th Australasian Conference on the Mechanics of Structures and Materials (ACMSM17), Gold Coast, Queensland, Australia. [S. l ]: A.A. Balkema Publishers, 2002: pp.199-204.

[4] Liu Guirong, Song Yupu. Temperature field of reinforced concrete shear walls exposed to fire[J]. Concrete, Vol. 243(1)( 2010), pp.4-6. (in Chinese)

[5] Zhenxian Xing, Rinong Zhou. Recycled concrete performance research and development of train[J]. New Building Materials, Vol. (7)( 1999), pp.29-31. (in Chinese)

[6] Yunbiao Huang. Research on the Thermal Properties of Recycled Concrete[D]. Master's Degree Thesis of Tongji University, 2006. (in Chinese)

[7] Jianzhuang Xiao, Zhiwen Song, Lan Zhang. An experimental study on thermal conductivity of concrete[J]. Journal of Building Materials.Vol. 13(1)( 2010), pp.17-21. (in Chinese)

[8] Wanlin Cao, Jianwei Zhang, Haipeng Yin, et al. Experimental study on the seismic behavior of recycled concrete frame-shear-wall structure[J]. Engineering Mechanics, Vol. 27(S2)(2010), pp.135-141. (in Chinese)

[9] Wanlin Cao, Hongying Dong, Jianwei Zhang. Study on seismic performance of RAC shear wall with different shear-span ratio[C]. Proceedings of the 2nd International Conference on Waste Engineering and Management ICWEM 2010, Shanghai, China, pp.652-660

[10] JGJ3-2002, High-rise Building Technical Specification for Concrete Structures[S]. Beijing: China Architecture and Building Press,2002. (in Chinese)

[11] GB/T 9978-2008, Fire-resistance tests - Elements of building construction. Beijing: Standards Press of China, 2008. (in Chinese)