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http://dx.doi.org/10.14190/JRCR.2017.5.1.059

Effect of Replacement of 5~13mm Recycled Coarse Aggregates on Field Applicability of the Concrete through Mock-up Test  

Han, Min-Cheol (Department of Architectural Engineering, Cheong-Ju University)
Song, Young-Woo (Department of Architectural Engineering, Cheong-Ju University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.5, no.1, 2017 , pp. 59-67 More about this Journal
Abstract
The objective of this paper is to investigate experimentally the effect of replacement of recycled coarse aggregates with 5~13mm in size on a field applicability of concretes through Mock-up test. Seven different mock-up specimens were prepared with the size of $1200{\times}800{\times}800mm$ simulating column and wall. For the concrete mixtures, 24MPa, 27MPa and 40MPa of nominal strength were adopted with 30% and 70%(only for 24MPa) of 5~13mm recycled coarse aggregate (RCA) replacement and without 5~13mm RCA(Plain). For test items, slump, slump flow, compressive strength with different curing conditions, core drilling, rebound numbers and drying shrinkage were measured. Test results indicated that 30% of 5~13 mm RCA replacement resulted in increase in slump, slump flow and resistance against segregation, while air contents decreased compared to those of plain mixture. Compressive strength of concrete with 30% of 5~13mm RCA was shown to be higher than that of plain mixture due to optimum packing effect associated with presence of well graded aggregates. Rebound number of the mock-up specimen with 30% of 5~13mm RCA had lower fluctuation according to hitting location than that of plain mock-up specimen. It is believed from the results of the study that replacement of 30% of 5~13mm RCA brings desirable improvement in various aspect of concrete performance due to associated dense packing effect.
Keywords
Recycled coarse aggregate; Carbonation; Continous grade; Mock-up test;
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Times Cited By KSCI : 2  (Citation Analysis)
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