کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6717968 503529 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Stability and decomposition mechanism of ettringite in presence of ammonium sulfate solution
ترجمه فارسی عنوان
سازوکار پایداری و تجزیه اترینیت در حضور محلول سولفات آمونیوم
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
The formation and transformation characteristics of ettringite play an extremely important effect on the accelerated hardening and expansion of concrete as well as its long term durability. In alkaline condition, ettringite can be existed stably; but when the alkalinity exceeds a certain value, ettringite can be decomposed into calcium monosulfoaluminate (AFm). In this paper, the stability and its decomposition mechanism of ettringite in alkaline (NH4)2SO4 solution were then investigated. The results show that in alkaline environment, decomposition of ettringite can be occurred and main produces were gypsum and Al(OH)3 as long as the concentration of (NH4)2SO4 reached to a certain extent. Based on experiment data, a kind of NH4+ involved decomposition mechanism of ettringite had been proposed by method of quantum mechanics combined with frontier molecular orbital theory and thermodynamic theory.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 124, 15 October 2016, Pages 786-793
نویسندگان
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