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http://dx.doi.org/10.5345/JKIBC.2017.17.1.055

Property Evaluation of the Concrete Replacing 5-13mm Recycled Coarse Aggregates  

Han, Min-Cheol (Department of Architectural Engineering, Cheong-Ju University)
Song, Young-Wo (Department of Architectural Engineering, Cheong-Ju University)
Publication Information
Journal of the Korea Institute of Building Construction / v.17, no.1, 2017 , pp. 55-61 More about this Journal
Abstract
This paper is to investigate experimentally the effect of substitution of recycled coarse aggregate(RCA) under 13mm on the engineering properties of the concrete using gap graded coarse aggregates. Concretes with 0.4 of water to cement ratio(W/C) were fabricated to achieve 30MPa of design strength with coarse aggregate over 13mm in size with the maximum size of 25mm. RCA was substituted for coarse aggregate over 13mm from 10% to 50% and crushed coarse aggregate under 13mm was also substituted for coarse aggregate over 13mm from 20% to 40%, respectively. Test results indicated that the replacement of RCA up to 20% resulted in an increase of fluidity and strength. It also caused a decrease in the drying shrinkage due to dense packing effect by achieving continuous grading of mixed aggregates. For practical application of RCA, when properly substituted, the use of RCA enabled the concrete to reduce water contents and sand to aggregate ratio in mixing design stage of the concrete. And, it can also enhance the compressive strength of the concrete.
Keywords
continuous grading; recycled coarse aggregates; crushed coarse aggregate; gap grading;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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