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Title |
Analysis of Concrete Core Strength with and without Rebar |
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Author |
Rahmat Madandoust, Malek Mohammad Ranjbar, Komeyl Momeni |
| Citation |
Vol. 26 No. 5 pp. 69-80 |
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Abstract |
Core tests have usually been concerned due to concretes strength analysis in concretes industry and occasionally, it turns to a unique tool for testing the strength of concrete structures. Therefore, the bone test is provided in most codes. Rebar existence impacts on the results, and some regulations insist that bones should be used without rebar and some others has no prohibition unless by taking into account the correction factor. In the present experimental study, the effective factors on core’s strength containing rebar were investigated. To this end, 112 simple concrete beams were created and reinforced with 10 and 16 mm- diameter bars (with the diverse layouts) and with two mix designs, water-cement ratios of 0.4 and 0.55. The beams were operationalized and maintained in environmental conditions. 988 concrete cores of 10 and 7.5 centimeters in diameter, with a length to diameter ratio of 1 and 2 on ages of 14, 28 and 56 days were drilled and their strength was examined. In most occasions, by increasing the value of water/cement from 0.4 to 0.55, strength of cored rebar was reduced compared to the cores without rebar. By increasing the rebar covering, core’s strength is reduced. Decrease percentage of one-rebar containing cores is increased by raising the rebar diameter, compared to the cores without rebar. By increasing the rebar’s numbers, the strength is reduced. The biggest strength’s reduction is occurred in cores with two rebars φ16, which the strength is reduced 23% compared to the core without rebar. Rebared cores would have bigger strength’s decrease with extra-axial compared to the same state without extra-axial. |
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Keywords |
Cores tests, Strength, Steel Rebar |
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