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http://dx.doi.org/10.14190/JRCR.2017.5.1.085

Carbonation Properties of Recycled Aggregate Concrete by Specified Concrete Strength  

Lee, Jun (Daejeo & Chungnam Branch, Korea Conformity Laboratories)
Lee, Bong-Chun (Daejeo & Chungnam Branch, Korea Conformity Laboratories)
Cho, Young-Keun (High-tech Construction Materials Center, Korea Conformity Laboratories)
Park, Kwang-Min (High-tech Construction Materials Center, Korea Conformity Laboratories)
Jung, Sang-Hwa (High-tech Construction Materials Center, Korea Conformity Laboratories)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.5, no.1, 2017 , pp. 85-93 More about this Journal
Abstract
This paper presents mechanical properties and carbonation behavior of the recycled aggregate concretes(RAC) in which natural aggregate was replaced by recycled coarse aggregate and fine aggregate by specified concrete strength levels(21, 35, 50MPa). A total of 18 RAC were produced and classified into six series, each of which included three mixes designed with three specified concrete strength levels of 21MPa, 35MPa and 50MPa and three recycled aggregate replacement ratios of 0, 50 and 100%. Physical and mechanical properties of RAC were tested for slump test, compressive strength, and carbonation depth. The test results indicated that the slump of RAC could be improved or same by recycled coarse aggregate replacement ratios, when compared with natural aggregate. But slump of RAC was decreased as the recycled fine aggregate replacement ratios increase. Also, the test results showed that the compressive strength was decreased as the recycled aggregate replacement ratios increased and it had a conspicuous tendency to decrease when the content of the recycled aggregate exceeded 50%. Furthermore, the result indicated that the measured carbonation depth increases by 40% with the increase of the recycled aggregate replacement. In the case of the concrete having low level compressive strength, the increase of carbonation depth tends to be higher when using the RCA. However, the trend of carbonation resistivity in high level compressive strength concrete is similar to that obtained in natural aggregate concrete. Therefore, an advance on the admixture application and mix ratio control are required to improve the carbonation resistivity when using the recycled aggregate in large scale.
Keywords
Construction waste; Recycled aggregate; Concrete; Specified concrete strength; Carbonation;
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Times Cited By KSCI : 2  (Citation Analysis)
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