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Studies on Hydration Swelling and Bound Water Type of Sodium- and Polymer-Modified Calcium Bentonite
المؤلفون المشاركون
Wan, Yong
Liu, Lei
Guo, Dongdong
Hui, Xinminnan
Yao, Yuan
المصدر
Advances in Polymer Technology
العدد
المجلد 2020، العدد 2020 (31 ديسمبر/كانون الأول 2020)، ص ص. 1-11، 11ص.
الناشر
Hindawi Publishing Corporation
تاريخ النشر
2020-10-09
دولة النشر
مصر
عدد الصفحات
11
التخصصات الرئيسية
الملخص EN
Modified calcium bentonite (Ca-bentonite) is extensively used in engineered barrier systems (EBSs) for municipal and industrial disposal sites due to its high swelling potential and low hydraulic conductivity.
However, few studies have focused on the micromechanism of hydration and swelling under the effect of inorganic chemical solution.
In this study, free swell index (FSI) and the type and content of modified Ca-bentonite bound water under the inorganic chemical solution were quantitatively studied by using the free swell test and nuclear magnetic resonance (NMR).
According to the results, modification of sodium and polymer significantly increases the FSI of Ca-bentonite, bringing it close to that of natural sodium bentonite.
In addition, the chemical stability of polymer-modified bentonite is significantly higher than that of sodium-modified bentonite but less than that of natural Na-bentonite.
The FSI of modified Ca-bentonite decreases with the increase of cation valence and ionic strength.
T2 distribution curves of the two types of modified bentonite are three-peak curves.
With the increase of ionic strength, the content of total water and permeated hydrated water (accounting for 69%–95%) in bentonite decreases gradually, whereas the surface hydration water (accounting for 2%–31%) and free water content (accounting for 0–15%) increase.
A uniform linear relationship exists between the FSI and corresponding total peak area of NMR (independent of ion valence, concentration, and bentonite type).
Furthermore, a linear relationship exists between the FSI of the same type of bentonite and the T2 relaxation time.
Research results can provide data and theoretical basis for quantitative analysis and mechanism of the hydration swelling of bentonite.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Wan, Yong& Guo, Dongdong& Hui, Xinminnan& Liu, Lei& Yao, Yuan. 2020. Studies on Hydration Swelling and Bound Water Type of Sodium- and Polymer-Modified Calcium Bentonite. Advances in Polymer Technology،Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1130433
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Wan, Yong…[et al.]. Studies on Hydration Swelling and Bound Water Type of Sodium- and Polymer-Modified Calcium Bentonite. Advances in Polymer Technology No. 2020 (2020), pp.1-11.
https://search.emarefa.net/detail/BIM-1130433
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Wan, Yong& Guo, Dongdong& Hui, Xinminnan& Liu, Lei& Yao, Yuan. Studies on Hydration Swelling and Bound Water Type of Sodium- and Polymer-Modified Calcium Bentonite. Advances in Polymer Technology. 2020. Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1130433
نوع البيانات
مقالات
لغة النص
الإنجليزية
الملاحظات
Includes bibliographical references
رقم السجل
BIM-1130433
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
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