木钙源EICP溶液固化路基黄土性能研究

doi:10.11896/cldb.21050040

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Abstract The mechanical loss of subgrade loess contacting with water impacts gravelythe line's circulation. Facing to the loess subgrade engineering issue, attempts to improve the loess strength using the EICP technology, a process of calcium carbonate precipitation induced by plant-extracted urease. Especially, replacing the traditional calcium source with environmentally friendly calcium lignosulfonate in the cementation process of the EICP technology improvement was studied systematically. The results show that firstly EICP solution of calcium lignosulfonate can significantly improve both the lateral unlimited compressive strength and shear strength of loess, wherein the compressive one increases to 0.232 MPa, increased by 20.8%, the C value of shear strength index increases to 69.06 kPa, increased by 31.2%, and the Φ value increases to 26.8°, increased by 52.3%. Secondly, the shear improvement effect of the loess with EICP solution of calcium lignosulfonate is obviously better than that of the loess with EICP solution of calcium chloride and the one of calcium acetate. The optimal concentration of each component of calcium lignosulfonate-EICP solution is 3 g/L for 1 000 U/g active urease, 1 mol/L for urea and 1 mol/L for calcium lignosulfonate. Moreover, with the increase of the dosage of calcium lignosulfonate-EICP solution, the shear strength of the loess primarily increases but then decreases. Finally, microscopic test results (XRD and SEM) demonstrate that the mechanism of the loess solidified by calcium lignosulfonate-EICP solution is mainly linked to the new calcium carbonate deposits. The deposits were induced both on the surface of the loess skeleton particles and in pore filling. As a result, the friction strength between the loess skeleton particles rise up, as well as the bonding connection strength reinforced, so that the mechanical properties of loess are improved in the end.

Key words： urease-induced calcium carbonate deposition (EICP) calcium lignosulfonate loess strength microscopic mechanism

Published: 10 August 2022 Online: 2022-08-15

CLC number:

TU458

Fund:National Natural Science Foundation of China (51579013), Natural Science Foundation of Central Universities (300102280106) and Natural Science Basic Research Program of Shaanxi Province (2021JQ-232).

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	TIAN Wei
	LI Teng
	JIA Neng
	HE Li
	ZHANG Xueke
	ZHANG Xudong

Cite this article:

TIAN Wei,LI Teng,JIA Neng, et al. Properties of Subgrade Loess Solidified by Calcium Lignosulfonate-EICP Solution[J]. Materials Reports, 2022, 36(15): 21050040-8.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.21050040 OR http://www.mater-rep.com/EN/Y2022/V36/I15/21050040

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