Experimental Study on Strength Deterioration Law of Cement Soil Mixed with Iron Ore Tailings under Wetting-Drying Cycles

HU Jian-lin; GAO Peng-fei; CUI Hong-huan; ZHANG Yu-long

doi:10.11988/ckyyb.20210294

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Journal of Changjiang River Scientific Research Institute ›› 2022, Vol. 39 ›› Issue (5) : 95-98. DOI: 10.11988/ckyyb.20210294

ROCK SOIL ENGINEERING

Experimental Study on Strength Deterioration Law of Cement Soil Mixed with Iron Ore Tailings under Wetting-Drying Cycles

HU Jian-lin^1,2, GAO Peng-fei¹, CUI Hong-huan^1,2, ZHANG Yu-long¹

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Abstract

In order to explore the mechanical properties and anti-deterioration ability of iron tailings cement soil, we conducted unconfined compressive strength test and wetting-drying cycle test to examine the influences of cement content, iron tailing sand content and number of drying and wetting cycles on the strength of iron tailings cement soil. Results demonstrated that a dosage of 20% iron tailing sand had a largest improvement effect on the strength of cement soil, improving by about 70%; a dosage of 40% iron tailing sand had a least enhancement effect. Dry-wet cycles had deterioration effects of varied levels on the strengths of plain cement soil and iron tailings cement soil: the strength loss of plain soil-cement was greater at the initial stage of cycle than that in the later stage and tended to be gentle gradually, while the strength loss of iron tailings cement-soil was small at the initial stage of cycle, and the strength deteriorated obviously after a certain number of cycles. The main reason for the deterioration of cement-soil strength is the stress concentration caused by the drying shrinkage and wetting swelling of pores.

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mechanical properties / tailings of iron ore / cement-soil / wetting-drying cycles / strength loss

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HU Jian-lin, GAO Peng-fei, CUI Hong-huan, ZHANG Yu-long. Experimental Study on Strength Deterioration Law of Cement Soil Mixed with Iron Ore Tailings under Wetting-Drying Cycles[J]. Journal of Changjiang River Scientific Research Institute. 2022, 39(5): 95-98 https://doi.org/10.11988/ckyyb.20210294

References

[1] 张茂花,杨静,刘亚静.纳米材料对低掺量水泥土早期强度的影响[J]. 中外公路, 2015, 35(3):239-242.
[2] 张陈, 李娜, 王伟,等. 纳米MgO改性滨海水泥土的直剪试验及微观机理[J]. 长江科学院院报, 2019, 36(4):139-143.
[3] 王立峰,翟惠云.纳米硅水泥土抗压强度的正交试验和多元线性回归分析[J].岩土工程学报, 2010, 32(增刊1):452-457.
[4] 胡汉兵,胡胜刚,刘芳.粉细砂水泥土力学与渗透特性试验研究[J].长江科学院院报,2013,30(10):48-53.
[5] 刘文博, 姚华彦, 王静峰, 等.铁尾矿资源化综合利用现状[J].材料导报, 2020, 34(增刊1):268-270.
[6] WANG Zhi-yong, LUO Qun, LIANG Bo, et al. Strength Evolution Law and Mechanism Analysis of Red Sandstone Subgrade Soil Under Wetting-drying Cycles[C]//International Civil Engineering Commission. Proceedings of the 2nd International Conference on Civil Engineering and Rock Engineering, Guangzhou, China, December 2-3, 2017: 294-300.
[7] WANG J H, GAO Y Q. Study on the Strength Degradation Mechanism of Cement-Soils Resulting from Dry-Wet Cycles[J]. China Railway Science, 2006(5): 23-27.
[8] 杨俊,童磊,张国栋,等.干湿循环对风化砂改良膨胀土无侧限抗压强度的影响[J].武汉大学学报(工学版), 2014, 47(4):532-536.
[9] 周永祥,阎培渝.固化盐渍土经干湿循环后力学性能变化的机理[J].建筑材料学报, 2006, 9(6):735-741.
[10] 张洁.聚丙烯纤维水泥土抗压强度及干湿循环耐久性能试验研究[J]. 中外公路, 2018, 38(6):235-238.
[11] 郑旭,刘松玉,蔡光华,等.活性MgO碳化固化土的干湿循环特性试验研究[J]. 岩土工程学报, 2016, 38(2):297-304.
[12] JGJ/T 233—2011, 水泥土配合比设计规程[S].北京:中国建筑工业出版社, 2002.
[13] 袁志辉, 倪万魁,唐春,等. 干湿循环下黄土强度衰减与结构强度试验研究[J].岩土力学, 2017, 38(7):1894-1902.
[14] HORPIBULSUK S, MIURA N, NAGARAJ T S. Assessment of Strength Development in Cement-admixed High Water Content Clays with Abrams Law as a Basis[J]. Geotechnique, 2003, 53(4): 439-444.
[15] 查甫生,刘晶晶,许龙,等.水泥固化重金属污染土干湿循环特性试验研究[J].岩土工程学报, 2013, 35(7):1246-1252.