کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4923072 1430635 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Early age behaviour of recycled concrete aggregates under normal and severe drying conditions
ترجمه فارسی عنوان
رفتارهای اولیه بتن های بازیافت شده در شرایط خشک شدن طبیعی و شدید
کلمات کلیدی
بتن بازیافت شده، انقباض پلاستیک، خشک شدن شدید ترک خوردن، بتن تازه، نرخ تبخیر،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
The use of recycled aggregates in concrete mixtures is a part of waste recovery strategy. The French national project RECYBETON aims at developing scientific knowledge to facilitate the use of recycled aggregates into concrete. In this experimental study, two exposure conditions were combined to analyse the behaviour of fresh and hardening concrete in standard and severe drying conditions (8 m s−1 wind speed). High evaporation rate promotes the development of plastic shrinkage and cracking of fresh concrete. The influence of recycled concrete aggregates proportion and initial water saturation rate were investigated. Two series of concrete mixtures were designed to reach two strength classes. The strains and weight loss of concrete samples were monitored until the stabilization of plastic shrinkage. The increase in evaporation rate accelerated the development and increased the maximum value of plastic shrinkage but did not significantly influence the shrinkage-to-weight loss ratios. In severe conditions plastic shrinkage developed before initial setting thus reached higher magnitudes. The main mix-design parameter affecting the shrinkage-to-weight loss ratio and cracking was the total water-to-binder ratio. The total water content includes the water added and the water used to pre-saturate the aggregates. High evaporation rate triggered the release of water initially absorbed by recycled concrete aggregates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Building Engineering - Volume 13, September 2017, Pages 244-253
نویسندگان
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