Destructive effect of steel slag coarse aggregate on the concrete under autoclaved condition

MI Guidong; WANG Qiang; WANG Weilun

PDF(3033 KB)

Journal of Tsinghua University(Science and Technology) ›› 2015, Vol. 55 ›› Issue (9) : 940-944.

CIVIL ENGINEERING

Destructive effect of steel slag coarse aggregate on the concrete under autoclaved condition

{{article.zuoZhe_EN}}

Author information +

History +

Abstract

This study analyzes the destructive effect of steel slag coarse aggregate on concrete with bad steel slag. The destructive effect of steel slag coarse aggregate on different strength concrete samples was investigated by autoclave tests of the steel slag coarse aggregate and the concrete containing the steel slag coarse aggregate. The free CaO and MgO mass ratios of the steel slag were 4.83% and 4.76%. The results show that the free CaO and the minerals containing MgO react rapidly at high temperatures, which crushes the steel slag aggregate due to the interior expansion stresses. The concrete containing the steel slag coarse aggregate might be damaged by the expansion stresses caused by the steel slag. The concrete damage is more severe with higher steel slag coarse aggregate mass ratios. Though the higher strength concrete can resist higher interior expansion stresses caused by the steel aggregate, the aggregate content should still be strictly controlled. For the steel slag used in this paper, the steel slag coarse aggregate mass ratios should be less than 40%.

Key words

steel slag / coarse aggregate / autoclave test / expansion stresses

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

MI Guidong, WANG Qiang, WANG Weilun. Destructive effect of steel slag coarse aggregate on the concrete under autoclaved condition[J]. Journal of Tsinghua University(Science and Technology). 2015, 55(9): 940-944

References

[1] LI Jianxin, YU Qijun, WEI Jiangxiong, et al. Structural characteristics and hydration kinetics of modified steel slag [J]. Cement and Concrete Research, 2011, 41(3): 324-329.
[2] YI Huang, XU Guoping, CHENG Huigao. An overview of utilization of steel slag [J]. Procedia Environmental Sciences, 2012, 16(10): 791-801.
[3] SHI Caijun. Steel slag-Its production, processing, characteristics, and cementitious properties [J]. Journal of Materials in Civil Engineering, 2004, 16 (3): 230-236.
[4] WANG Qiang, YAN Peiyu, FENG Jianwen. A discussion on improving hydration activity of steel slag by altering its mineral compositions [J]. Journal of Hazardous Materials, 2011, 186 (2): 1070-1075.
[5] Luckman M, Satish V, Venkateswaran D. Cementitious and pozzolanic behavior of electric arc furnace steel slag [J]. Cement and Concrete Research, 2009, 39 (2): 102-109.
[6] Maslehuddin M, Alfarabi M, Shameem M, et al. Comparison of properties of steel slag and crushed limestone aggregate concretes [J]. Construction and Building Materials, 2003, 17 (2): 105-112.
[7] Inanka N, Dubravka B, Goran V. Utilisation of steel slag as an aggregate in concrete [J]. Materials and Structures, 2011, 44 (9): 1565-1575.
[8] 尚建丽, 刑琳琳. 钢渣粗骨料混凝土界面过渡区的研究 [J]. 建筑材料学报, 2013, 16(2): 217-220.SHANG Jianli, XING Linlin. Study on interfacial transition zone of steel slag coarse aggregate concrete [J]. Journal of Building Materials, 2013, 16(2): 217-220.
[9] Qian G R, Sun D D, Tay J H, et al. Hydrothermal reaction and autoclave stability of Mg bearing RO phase in steel slag [J]. British Ceramic Transactions, 2002, 101(4): 159-164.
[10] 肖琪仲. 钢渣的膨胀破坏与抑制 [J]. 硅酸盐学报, 1996, 24(6): 635-640.XIAO Qizhong. Expansion and its inhibition of steel slag [J]. Journal of the Chinese Ceramic Society, 1996, 24(6): 635-640.
[11] ZHANG Tongsheng, YU Qijun, WEI Jiangxiong, et al. Preparation of high performance blended cements and reclamation of iron concentrate from basic oxygen furnace steel slag [J]. Resources, Conservation and Recycling, 2011, 56(1): 48-55.
[12] LIU Chunlin, ZHA Kunpeng, CHEN Depeng. Possibility of concrete prepared with steel slag as fine and coarse aggregates: A preliminary study [J]. Procedia Engineering, 2011, 24 (12): 412-416.
[13] Qian G R, Darren D S, Tay J H, et al. Autoclave properties of kirschsteinite-based steel slag [J]. Cement and Concrete Research, 2002, 32(9): 1377-1382.