کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
259082 503627 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evaluation of alkali reactivity of natural sands
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
Evaluation of alkali reactivity of natural sands
چکیده انگلیسی

Natural sands may lead to alkali–silica reaction in concrete when the conditions are favorable. However, natural sands vary in composition and therefore may demonstrate different reaction characteristics. The aim of this study is to compare alkali–silica reactivity of seven different natural sands with different origin. The particle size distributions for sand samples were firstly obtained by sieving method. Petrographic examinations, mineralogical and chemical analyses were firstly conducted to determine the mineralogical and chemical composition of sands. Then, accelerated mortar bar tests, ASTM C 1260, were performed. Additionally, SEM observations were conducted on the mortar bars. According to the results obtained, sands containing active silica and silicate minerals, metamorphic and volcanic rock particles are found to be potentially dangerous for alkali–silica reaction (ASR). The SEM observations have supported the expansion data.

▸ Natural sands demonstrate different reactions when using in concrete production. ▸ The paper highlights importance of composition of the natural sand on ASR. ▸ We examine reactivity of different natural sands with different origin. ▸ Active silica, silicate minerals and rock particles are generally dangerous for ASR.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 29, April 2012, Pages 378–385
نویسندگان
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