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CLC number: TU472.4

On-line Access: 2016-05-04

Received: 2015-06-19

Revision Accepted: 2015-12-15

Crosschecked: 2016-04-15

Cited: 1

Clicked: 3900

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Yin Cheng

http://orcid.org/0000-0001-6169-7903

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Journal of Zhejiang University SCIENCE A 2016 Vol.17 No.5 P.389-398

http://doi.org/10.1631/jzus.A1500185


Laboratory investigation of the strength development of alkali-activated slag-stabilized chloride saline soil


Author(s):  Yin Cheng, Hao Yu, Bao-lin Zhu, Dao-xin Wei

Affiliation(s):  Road Construction and Materials Research Center, China Academy of Transportation Sciences, Beijing 100029, China; more

Corresponding email(s):   chengyin19840918@sina.com

Key Words:  Chloride saline soil, Alkali-activated slag (AS), Stabilized soil, Strength, Friedel’, s salt (Fs), NaOH


Yin Cheng, Hao Yu, Bao-lin Zhu, Dao-xin Wei. Laboratory investigation of the strength development of alkali-activated slag-stabilized chloride saline soil[J]. Journal of Zhejiang University Science A, 2016, 17(5): 389-398.

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%T Laboratory investigation of the strength development of alkali-activated slag-stabilized chloride saline soil
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%A Hao Yu
%A Bao-lin Zhu
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%DOI 10.1631/jzus.A1500185

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T1 - Laboratory investigation of the strength development of alkali-activated slag-stabilized chloride saline soil
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DOI - 10.1631/jzus.A1500185


Abstract: 
Saline soil stabilization is being increasingly applied in foundation treatment engineering. chloride saline soil obtained from sites and laboratory-made chloride soil (ZS) with various NaCl concentrations prepared artificially were stabilized using alkali-activated slag (AS). A series of unconfined compressive strength (UCS) tests, X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDXA), thermal gravity–differential thermal gravity (TG–DTG), and ion concentration tests were conducted to investigate the strength variation and mechanism of the AS-stabilized chloride saline soils. The results showed that NaCl has a significant influence on the strength of AS-stabilized chloride saline soil and the strength of AS-stabilized ZS (GZS) increases with increase of chloride content in soil samples. friedel’;s salt (Fs) and naOH are generated by the reaction of NaCl and CaO·Al2O3 (CA) in the slag in the GZS. Fs can fill the pores in stabilized soil, and naOH can promote calcium silicate hydrate (CSH) generation. These two effects combine to enhance the strength of GZS. The relationship between the rate of increase of 28-d UCS of AS-stabilized chloride saline soil and the chloride content in soil was obtained through regression analysis of the increase of UCS of GZS.

This article mainly focuses on the compressive strength and mechanism of alkali-activated slag-stabilized chloride saline soil. The paper overall writing quality of English language is very good and the results and discussions could be helpful to the relevant studies.

矿渣固化氯盐渍土强度变化规律试验研究

目的:探讨矿渣固化氯盐渍土强度变化规律及作用机理,为氯盐渍土有效固化提供依据。
创新点:评价矿渣固化高含盐量氯盐渍土的效果,分析矿渣固化氯盐渍土固化机理,提出具有一定适用性的拟合关系式。
方法:通过固化土无侧限抗压强度试验、X射线衍射、能谱分析、热重及液相离子浓度测试对固化氯盐渍土强度及微观结构进行分析。
结论:1. 氯化钠是影响矿渣固化氯盐渍土强度的主因;2. 矿渣固化氯盐渍土强度随土中含氯量增加而增强,铝酸钙与氯化钠反应生成的水化氯铝酸钙填充孔隙及氢氧化钠提高液相碱度是增强固化土强度的主因;3. 通过固化土强度增量曲线拟合分析,得到矿渣固化氯盐渍土强度增量与含氯量关系式。

关键词:氯盐渍土;碱激发矿渣;固化土;强度;水化氯铝酸钙;氢氧化钠

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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