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Title |
Flexural Strength of Reinforced Concrete Beams Containing Recycled Coarse Aggregate
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Authors |
양인환(In-Hwan Yang) ; 안슬기(Seul-Ki An) ; 황철성(Chul-Sung Hwang) |
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DOI |
https://doi.org/10.11112/jksmi.2017.21.1.030 |
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Keywords |
순환굵은골재 ; 골재치환률 ; 철근비 ; 균열 ; 휨강도 Recycled coarse aggregate ; Aggregate replacement ratio ; Rebar ratio ; Crack ; Flexural strength |
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Abstract |
This paper concerns flexural strength of reinforced concrete beams containing recycled coarse aggregate (RCA) with compressive strength ranging from 31 to 38 MPa. The experimental parameters were replacement ratio of RCA and rebar ratio. Replacement ratio of RCA was 0, 30, 50 and 100%, and rebar ratio was 0.50, 0.79 and 1.14%. The RCA concrete beams were tested by using four-point bending test, and experimental results were discussed regarding crack and failure patterns, load-deflection relationship. Crack pattern of concrete beams with RCA was similar to that of concrete beams with natural coarse aggregate (NCA) but overall crack spacing of concrete beams with RCA was smaller than that of concrete beams with NCA. The crack width of RCA and NCA concrete beams was similar to each other. In addition, the test results of flexural strength were compared to the design code predictions. The design code predictions for flexural strength underestimated the experimental results. Therefore, the design code predictions for flexural strength of RCA concrete beams would offer conservative design.
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