کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8046027 | 1519030 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Modified bentonites for soil-bentonite cutoff wall applications with hard mix water
ترجمه فارسی عنوان
بنتونیت های اصلاح شده برای برنامه های کاربردی دیوارهای خاک بنتونیتی با آب مخلوط سخت
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
چکیده انگلیسی
The influence of mix water hardness and bentonite type on the quality of bentonite slurry and hydraulic performance of soil-bentonite backfill mixtures was investigated through slurry quality testing and flexible-wall hydraulic conductivity (k) testing of soil-bentonite backfill specimens. A conventional sodium bentonite (NG) and two types of modified bentonite, HYPER clay (HC) and multiswellable bentonite (MSB), were used to prepare the slurries and backfills. Slurries were prepared with mix waters containing CaCl2 concentrations (CM) ranging from 0.5 to 25â¯mM (hardness, HMâ¯=â¯50-2500â¯mg/L as CaCO3), and backfills with similar total bentonite contents (5.5-5.9%) were prepared by combining dry sand-bentonite mixtures with the slurries in a benchtop mixer. Backfill specimens were permeated using CaCl2 solutions with concentrations, CP, ranging from 0.5 to 50â¯mM. The results of the slurry testing showed that the impact of the mix water on slurry quality parameters (Marsh viscosity, filtrate loss, and bleed) was dependent upon CM, bentonite type, and bentonite content. For CMâ¯â¤â¯5â¯mM (HMâ¯â¤â¯500â¯mg/L), slurry containing 5% NG exhibited adequate viscosity, filtrate loss, and bleed. However, NG contents of 7% and 12% were required to obtain adequate viscosity, filtrate loss, and bleed for CMâ¯=â¯10â¯mM (HMâ¯=â¯1000â¯mg/L) and 25â¯mM (HMâ¯=â¯2500â¯mg/L), respectively, whereas adequate slurry properties were obtained for CMâ¯=â¯10â¯mM using lower percentages (5-6%) of HC or MSB. In terms of backfill k, the specimens containing HC amended with polyanionic cellulose appeared to be the most resilient against hard mix water. The k of backfill specimens containing NG generally exceeded 10â9â¯m/s when prepared using slurry with CMâ¯=â¯10â¯mM and exceeded 10â8â¯m/s when prepared using slurry with CMâ¯=â¯25â¯mM. In contrast, HC backfill specimens prepared using slurry with CMâ¯=â¯10 or 25â¯mM exhibited k ranging from 4â¯Ãâ¯10â11 to 5â¯Ãâ¯10â10 m/s. Overall, CM had greater influence on backfill k relative to CP for the range of CP considered in this study.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Clay Science - Volume 158, 15 June 2018, Pages 226-235
Journal: Applied Clay Science - Volume 158, 15 June 2018, Pages 226-235
نویسندگان
Anna Norris, Gemmina Di Emidio, Michael A. Malusis, Melissa Replogle,