کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10131891 1645545 2018 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Shrinkage strains of lightweight aggregate concrete using expanded bottom ash and dredged soil granules
ترجمه فارسی عنوان
سویه های کوچک شدن بتن های سبک وزن با استفاده از خاکستر خاکستری گسترش یافته و دانه های خرد شده خاک
کلمات کلیدی
بتن سبک، انقباض، تابع زمان، تخلخل معادل، خاکستر پایین خاک تخریب شده
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
The objective of the present study is to provide a databank and comprehensible design equations for the shrinkage strain curve of lightweight aggregate concrete (LWAC) by using artificially expanded bottom ash and dredged soil granules. A total of 25 concrete mixtures were prepared with regard to the parameters of the substitution level of natural sand for lightweight fine aggregates and water-to-cement ratios. Based on the experimental observations, the time function, and 91-day shrinkage strain as a specific point were formulated by introducing the parameter of an equivalent porosity of aggregates to rationally evaluate the shrinkage strain curve of LWAC. Test results showed that the amount of shrinkage strain at 28 days ranged between 39% and 55% of that measured at 210 days, indicating that the acceleratory period was delayed due to the internal curing effect of lightweight aggregates. The shrinkage strains of LWAC decreased in proportion to the equivalent porosity (Peq) of aggregates, showing that the decreasing rates of the shrinkage strains ranged between 16% and 36% at 3 days, and 21% and 23% at 180 days when Peq value increased from 21.8% to 42.9%. For the proposed equations, the mean and standard deviation of the normalized root-mean-square error values between experiments and predictions are 0.44 and 0.21, respectively, resulting in a better accuracy than the code models (fib 2010 and EC 2) of which comparisons resulted in high overestimation, especially at an early age.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 188, 10 November 2018, Pages 934-945
نویسندگان
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