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Title |
Effects of Coating Materials and Application Methods on the Absorption Rate of Fine Aggregate Recycled from Waste Concrete
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Authors |
이병재(Byung-Jae Lee) ; 김규형(Kyu Hyoung Kim) ; 김윤용(Yun-Yong Kim) |
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DOI |
https://doi.org/10.4334/JKCI.2021.33.3.307 |
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Keywords |
폐콘크리트; 순환잔골재; 코팅; 아크릴수지; 흡수율 waste concrete; recycled fine aggregate; coating; acrylic resin; water absorption |
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Abstract |
In order to study the applicability of fine aggregate recycled from waste concrete as a concrete aggregate, the effects of coating materials and application methods on the absorption rate of fine aggregate were investigated. In addition, material properties, including flow and strength, of mortar produced with recycled fine aggregate were examined. From absorption rate tests, acrylic resin coating was the most effective in reducing the absorption rate, and vacuum impregnation was the most effective coating method. As a result of density tests, the KS standard requirement was satisfied in all coating conditions. In contrast, sieving test results were outside the range of the grading curve for sodium silicate and polydimethylsiloxane. The absorption characteristics over time of uncoated recycled fine aggregate showed a high initial absorption rate, whereas coated recycled fine aggregate showed a similar tendency of absorption rate over time as a natural aggregate. From a flow test of mortar, it was found that as the replacement rate of washed coated recycled fine aggregate for recycled fine aggregate increased, the amount of superplasticizer required to achieve a flow of 200 mm decreased. In the strength tests, the mix using ISO standard sand and the mix using 100 % washed coated recycled fine aggregate showed similar strength characteristics. This indicates the applicability of coated recycled fine aggregate.
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