Mechanism of cemented soil modified by aliphatic ionic soil stabilizer

被引：0

作者：

Xu F. ^{[1
,2
]}

Cai Y.-B. ^{[1
]}

Qian W.-X. ^{[1
]}

Wei H. ^{[1
]}

Zhuang H.-X. ^{[1
]}

机构：

[1] Nanjing Hydraulic Research Institute, Nanjing

[2] College of Water Conservancy and Hydropower, Hohai University, Nanjing

来源：

Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2019年 / 41卷 / 09期

关键词：

Adsorption characteristic; Cemented soil; Hydration product; Ionic soil stabilizer; Micro-characteristic;

D O I：

10.11779/CJGE201909012

中图分类号：

学科分类号：

摘要：

The relatively low early strength and significant cracks are the common issues for the cementitious materials-stabilized soil (cemented soil). To remedy its defects, novel ionic soil stabilizers (ISS) with dosages from 1/300 to 1/50 of water content volume of the cemented soil are applied. Through the tests on unconfined compressive strength and volume chemical shrinkage, the modification feasibility of ISS application is verified. Through the characterization and analyses of the surface adsorption behaviors, phase evolution and micro-structure, the modification mechanisms of ISS on cemented soil are systematically studied. The results indicate that the ISS molecules adsorb on the compositions of cemented soil selectively. After the ISS addition, the system dispersion is enhanced, the water combination capacity of soil minerals is reduced, thus accelerating the formation of hydration products, benefiting the pore distribution and increasing the volume chemical shrinkage. The optimum dosage of this study is 1/150, and the excessive addition will retard the modification effects but reduce the chemical shrinkage. The results can be used as a reference for the modification of cemented soil with ISS. © 2019, Science Press. All right reserved.

引用

页码：1679 / 1687

页数：8

共 24 条

[21]

Zeng Q., Li K., Et al., Determination of cement hydration and pozzolanic reaction extents for fly-ash cement pastes, Construction & Building Materials, 27, 1, pp. 560-569, (2012)

[22]

Metha P.K., Montero P.J., Concrete: Microstructure, Properties and Materials, (2006)

[23]

Tan H., Gu B., Ma B., Et al., Mechanism of intercalation of polycarboxylate superplasticizer into montmorillonite, Applied Clay Science, 129, pp. 40-46, (2016)

[24]

Aitakbour R., Boustingorry P., Leroux F., Et al., Adsorption of poly carboxylate poly (ethylene glycol) (PCP) esters on montmorillonite (Mmt): effect of exchangeable cations (Na+, Mg2+ and Ca2+) and PCP molecular structure, Journal of Colloid & Interface Science, 437, pp. 227-234, (2015)

← 1 2 3 →