[1]涂志斌,时伟,杨忠年,等.盐溶液对Na-膨润土膨胀率影响的试验研究[J].西安建筑科技大学学报(自然科学版),2020,52(01):98-106.[doi:10.15986j.1006-7930.2020.01.014]
　TU Zhibin,SHI Wei,YANG Zhongnian,et al.Study on the effect of salt solution on expansion rate of Na-bentonite[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2020,52(01):98-106.[doi:10.15986j.1006-7930.2020.01.014]
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盐溶液对Na-膨润土膨胀率影响的试验研究()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
52
期数:
2020年01期
页码:
98-106
栏目:
出版日期:
2020-03-31

文章信息/Info

Title:
Study on the effect of salt solution on expansion rate of Na-bentonite
文章编号:
1006-7930(2020)01-0098-09
作者:
涂志斌; 时伟; 杨忠年; 张莹莹
(青岛理工大学 土木工程学院,山东 青岛 266033)
Author(s):
TU Zhibin;  SHI Wei;  YANG Zhongnian;  ZHANG Yingying
(College of Civil Engineering, Qingdao University of Technology, Shandong Qingdao 266033, China)
关键词:
膨胀率;  抗衡离子;  浓度;  阳离子价态;  碱性
Keywords:
expansion rate;  counter ion;  concentration;  cation valence;  alkalinity
分类号:
TU443
DOI:
10.15986j.1006-7930.2020.01.014
文献标志码:
A
摘要:
为探究无机盐溶液浓度、阳离子价态以及碱性对钠基膨润土膨胀特性的影响规律,采用不同浓度的KCl、CaCl2、MgCl2、AlCl3、K2SO4、K2CO3、KOH、NaCl和NaOH溶液替代蒸馏水对钠基膨润土进行自由膨胀率试验.研究发现:盐溶液中的K+、Mg2+和Al3+取代了抗衡离子Na+,且随阳离子价态增加,对Na+的置换率逐渐增大; 钠基膨润土的自由膨胀率随溶液浓度的增加而下降,并且其过程分为三个阶段,金属阳离子价态越大,在第一阶段对膨胀潜力的抑制效果越显著; 当溶液浓度大于0.25 mol/L时,K+对膨润土膨胀潜力的抑制效果更为显著; 在盐溶液呈弱碱性时,其中少量的OH-会促使土颗粒的分散作用; 当NaOH溶液浓度低于0.6 mol/L时,自由膨胀率主要受溶液浓度的影响,当NaOH溶液浓度高于0.6 mol/L时,自由膨胀率受到溶液浓度和高pH值双重作用的影响.
Abstract:
In order to investigate the influence of the concentration of inorganic salt solution, cation valence and alkalinity on the swelling characteristics of sodium bentonite, sodium bentonite is tested for free expansion rate using different concentrations of KCl, CaCl2, MgCl2, AlCl3, K2SO4, K2CO3, KOH, NaCl and NaOH solutions instead of distilled water. It was found that K+, Mg2+ and Al3+ in the salt solution replaced the counter ion Na+, and the replacement ratio of Na+ increased with the increase of cation valence. The free expansion rate of bentonite decreased with the increase of solution concentration, and the process is divided into three stages. The higher the valence of the metal cation, the inhibitory effect of the first stage on the expansion potential is more pronounced. When the concentration of solution is more than 0.25 mol/L, the effect of K+ on the swelling potential of sodium bentonite is more significant. When the salt solution is weakly alkaline, a small amount of OH- promotes the dispersion of the soil particles. When the concentration of NaOH solution is lower than 0.6 mol/L, the free expansion rate is mainly affected by the concentration of the solution. When the concentration of NaOH solution is higher than 0.6 mol/L, the free expansion rate is affected by the dual affects of the concentration of the solution and the high pH.

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备注/Memo

备注/Memo:
收稿日期:2019-03-29修改稿日期:2020-01-14基金项目:冻土工程国家重点实验室开放基金项目(SKLFSE201601); 山东省泰山学者专项基金项目(2015-212); 国家重大科研仪器开发基金项目(41627801)第一作者:涂志斌(1993-),男,硕士,研究方向为岩土工程.E-mail:1404889748@qq.com通信作者:杨忠年(1985-),男,博士,讲师,主要从事岩土工程和隧道工程方面的教学和科研工作.E-mail:yzhnqd@qut.edu.cn
更新日期/Last Update: 2020-04-25