| Civil Engineering |
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| Swelling characteristics of GMZ01 bentonite affected by cation exchange reaction |
| XIANG Guo-sheng, FANG Yuan, XU Yong-fu |
| 1. School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan 243002, China；
2. School of Naval Architecture and Civil Engineering, Shanghai Jiaotong University, Shanghai 200030, China |
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Abstract The scientific problem of negative influence on bentonite swelling characteristics due to the ion exchange reaction between cations in infiltration groundwater and bentonite was analyzed. Gaomiaozi sodium bentonite (GMZ01) was mixed with sodium chloride, calcium chloride and magnesium chloride solution respectively. The mineral content and exchangeable cation content of the salt mixed samples were tested, and the swelling characteristics were tested in distilled water to analyze the changes in swelling properties of GMZ01 bentonite after cation exchange reaction. Results showed that the exchangeable Na+ content of GMZ01 bentonite mixed
with NaCl slightly increases, The swelling characteristics of bentonite mixed with 1 mol/L NaCl or 2 mol/L NaCl solution slightly differ when it tested in distilled water. After mixed with 1 mol/L CaCl2 and 1 mol/L MgCl2 solution, Na+ is replaced by Ca2+ and Mg2+, which caused the swelling properties of these two solution mixed samples to be less than 2 mol/L NaCl mixed samples. The divalent cations such as Ca2+ and Mg2+ have a strong inhibitory effect on the swelling properties of sodium bentonite．
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Published: 01 May 2017
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Cite this article:
XIANG Guo-sheng, FANG Yuan, XU Yong-fu. Swelling characteristics of GMZ01 bentonite affected by cation exchange reaction. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2017, 51(5): 931-936.
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阳离子交换对高庙子钠基膨润土膨胀性能的影响
为了研究高放废物处置库中入渗地下水中阳离子与膨润土发生离子交换反应进而对膨润土的膨胀性能产生不利影响的科学问题,将高庙子钠基（GMZ01）膨润土分别与氯化钠、氯化钙和氯化镁溶液相混合,通过对溶液混合后试样进行矿物含量和交换性阳离子含量测试,结合溶液混合试样在蒸馏水中的膨胀变形试验,研究GMZ01膨润土阳离子交换反应后膨胀性能的变化情况.结果表明,GMZ01膨润土与NaCl混合后交换性Na+量略有增加,用浓度为1 mol/L NaCl与2 mol/L NaCl溶液混合试样在蒸馏水中的膨胀性差距较小；与1 mol/L CaCl2和1 mol/L MgCl2溶液混合后,Ca2+和Mg2+置换了Na+,导致这2种溶液混合试样的膨胀性能均小于 2 mol/L NaCl溶液混合试样,表明Ca2+和Mg2+等二价阳离子对钠基膨润土的膨胀性有较强的抑制作用.
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