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Title |
Evaluation on the Physical Properties and Paste Adhesion of Recycled Coarse Aggregates Produced through Different Dry Treatments
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Authors |
김도겸(Do-Gyeum Kim) ; 양근혁(Keun-Hyeok Yang) ; 서은아(Eun-A Seo) ; 윤현섭(Hyun-Sub Yoon) |
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DOI |
https://doi.org/10.4334/JKCI.2020.32.2.185 |
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Keywords |
폐콘크리트; 순환 굵은 골재; 건식공정; 페이스트 부착량; 물리적 특성 waste concrete; recycled coarse aggregate; dry treatment; paste adhesion; physical properties |
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Abstract |
The present study estimated an effective dry treatment process to remove cement pastes attached on recycled coarse aggregates and investigated the physical properties of such aggregates. The dry treatment processes conducted in these tests included conventional trituration, trituration for 24 hours, trituration and light-calcination treatments, trituration and microwave treatments, and trituration and ultrasonic treatments. The physical properties (density, water absorption, and particle distribution) of aggregates treated through different processes were compared with minimum requirements specified in KS F 2527 for natural coarse aggregates. The paste removement was estimated from a immersion tests using 5 % sulfuric acid solution and pore size analysis on the surface of aggregates. Test results revealed that the recycled aggregates treated by trituration process for 24 hours possessed a similar level to the density and water absorption of natural aggregates, indicating lower variations in the mass and porosity decreases due to the detachment of cement pastes than those treated by other processes. Thus, trituration process for 24 hours can be practically useful for reducing cement pastes on the recycled aggregates without additional water treatment.
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