Experimental Investigation of the Compactability and Cracking Behavior of Polyacrylamide-Treated Saline Soil in Gansu Province, China

doi:10.3390/polym11010090

	Experimental Investigation of the Compactability and Cracking Behavior of Polyacrylamide-Treated Saline Soil in Gansu Province, China
	Zhang, Tongwei 1; Deng, Yongfeng 2; Lan, Hengxing 3,4; Zhang, Fanyu 1; Zhang, Huyuan 1; Wang, Chong 1; Tan, Yu 1; Yu, Rongguang 1
刊名	POLYMERS
	2019
卷号	11 期号:1 页码:12
关键词	saline soil polyacrylamide consistency limits compactability desiccation crack behavior
ISSN号	2073-4360
DOI	10.3390/polym11010090
通讯作者	Zhang, Tongwei(ztw@lzu.edu.cn) ; Deng, Yongfeng(noden@seu.edu.cn)
英文摘要	Polyacrylamide (PAM) is a water-soluble polymer with the ability to enhance a soil's stability. PAM is currently being used to prevent irrigation-induced erosion and enhance the infiltration in farmland soil. To improve the compaction properties of the saline-soil-based filling material that is used in highway subgrade and the cracking resistance capacity of a saline soil's crust, the consistency limits, compactability, microstructure, and cracking morphology of untreated and PAM-treated saline soil were investigated. The saline soils were sampled from the soil crust and a depth of 2.0-3.0 m in Gansu Province, China. Two PAM concentrations (0.1% and 0.5% in mass ratio) were selected. The liquid limits and plastic limits of the saline soil samples from the surface (0-0.05 m) and a depth of 2.0-3.0 m noticeably increased as PAM concentration increased. The maximum dry densities decreased as PAM concentration and plasticity increased, and the optimum water contents of the two saline soil types did not significantly change. These results suggest that a higher shearing resistance between particles partially prevented compression from occurring during compaction. Mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM) test results showed that the PAM agent dispersed the bulky pellets, and the soil's structure was formed by flaky and acicular platelets that filled the micropores. A quantitative analysis of crack patterns showed that the cross-points of the crack network and the crack length decreased as the PAM concentration increased. These results indicate that an increase in PAM reduces the shrinkage strain and the flaws or pores within saline soils. Therefore, PAM's stabilizing effect on saline soil under a wetting-drying cycle was proven.
资助项目	National Natural Science Foundation of China[41807225] ; National Natural Science Foundation of China[41572280] ; National Natural Science Foundation of China[41790443] ; National Natural Science Foundation of China[41525010] ; Fundamental Research Funds for the Central Universities[lzujbky-2018-8]
WOS关键词	DESICCATION CRACKING ; FURROW EROSION ; CLAY ; MECHANISMS ; MICROSTRUCTURE ; STABILIZATION ; PROPAGATION ; STRENGTH
WOS研究方向	Polymer Science
语种	英语
出版者	MDPI
WOS记录号	WOS:000457202000090
资助机构	National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/49933]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhang, Tongwei; Deng, Yongfeng
作者单位	1.Lanzhou Univ, Coll Civil Engn & Mech, Dept Geol Engn, Key Lab Mech Disaster & Environm Western China, Tianshui Rd 222, Lanzhou 730000, Gansu, Peoples R China 2.Southeast Univ, Sch Transportat, Inst Geotech Engn, SiPailou 2, Nanjing 210096, Jiangsu, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing 100101, Peoples R China 4.Changan Univ, Sch Geol Engn & Geomat, Xian 710064, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Tongwei,Deng, Yongfeng,Lan, Hengxing,et al. Experimental Investigation of the Compactability and Cracking Behavior of Polyacrylamide-Treated Saline Soil in Gansu Province, China[J]. POLYMERS,2019,11(1):12.
APA	Zhang, Tongwei.,Deng, Yongfeng.,Lan, Hengxing.,Zhang, Fanyu.,Zhang, Huyuan.,...&Yu, Rongguang.(2019).Experimental Investigation of the Compactability and Cracking Behavior of Polyacrylamide-Treated Saline Soil in Gansu Province, China.POLYMERS,11(1),12.
MLA	Zhang, Tongwei,et al."Experimental Investigation of the Compactability and Cracking Behavior of Polyacrylamide-Treated Saline Soil in Gansu Province, China".POLYMERS 11.1(2019):12.