کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6711794 1428721 2018 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Improving the shear performance of reinforced concrete beams made of recycled coarse aggregate
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
Improving the shear performance of reinforced concrete beams made of recycled coarse aggregate
چکیده انگلیسی
This paper investigates experimentally and analytically the shear performance of RC beams made of recycled coarse aggregate (RCA). Previous studies showed that the partial replacement of the virgin coarse aggregate by recycled one results in decrease the shear strength of RC beams. Consequently, the main target of the this research was to compensate such decrease in the shear strength by providing internal short fibers and using cured recycled coarse aggregate instead of crude recycled coarse aggregate. A total of eleven simply supported RC beams made of recycled coarse aggregate along with one conventional concrete beam were tested under incremental four-point loading scheme. The considered parameters were the recycled coarse aggregate replacement ratio (15, 30 and 45%), the shear span-to-depth ratio (1, 2 and 3) and the fiber volumetric ratio (1, 1.5 and 2%). In addition, to improve the physical and mechanical properties of the recycled coarse aggregate (RCA), two curing methods for the RCA were implemented using cement slurry and Styrene Butadiene Rubber (SBR) compound. The experimental results showed that increasing the replacement ratio of the RCA resulted in decrease the shear capacity proportionally. The percentages of decreases in the shear capacities were about 8%, 14% and 19%, respectively, for RC beams provided by RCA replaced by 15%, 30% and 45%. In addition, it was shown that providing internal short fibers by volumetric ratios of 1%, 1.5% and 2% enabled the RC beams made of 30% partial replacement of the recycled coarse aggregate to compensate the decreases in the shear capacities (14%) and to increase their shear capacities by about 13%, 15% and 22% compared to those of the control beam, respectively. Furthermore, for RC beams made of 30% partial replacement of the RCA, the shear capacities decreased by about 2%, 14% and 37%, respectively, for beams having shear span-to-depth ratio of 1, 2 and 3. Besides, it was shown that, the cured recycled coarse aggregate enabled the RC beams made of 30% partial replacement to exhibit improved shear performance. However, the curing method based on cement slurry showed higher improvement since the restored shear capacities were about 15% and 3% for beams provided by cured coarse aggregate based on cement slurry and compound SBR, respectively compared to that of the beam made of crude RCA. Finally, an equation for estimating the shear capacity of RC beams made of recycled coarse aggregate was proposed and it showed satisfactory results when verified against the experimental findings of the current research as well as of other researches where the maximum variations were about 8.5% and 22%, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 185, 10 October 2018, Pages 310-324
نویسندگان
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