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http://dx.doi.org/10.14190/JRCR.2022.10.2.133

A Study on Quality Improvement and Verification of Recycled Coarse Aggregate for Concrete Using an Impact Crusher with Radial Rotation  

Jeon, Duk-Woo (Kangwon National University)
Kim, Yong-Seong (Kangwon National University)
Jeon, Chan-Soo (Korea Institute of Civil engineering and Building Technology)
Choi, Won-Young (Korea Institute of Civil engineering and Building Technology)
Cho, Won-Ig (R&D Center, Kumkang Development Limited Partnership)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.10, no.2, 2022 , pp. 133-142 More about this Journal
Abstract
The purpose of this study is to develop an impact crusher with a radial rotating plate installed at the bottom, which is a shock absorber that can produce high-quality recycled coarse aggregate for concrete and to verify the effect of improving the quality performance of recycled coarse aggregate and its applicability through concrete tests. As a result, it showed improved quality in all items such as absolute dry density, absorption rate, abrasion resistance, Particle shape judgment rate, amount lost in the 0.08 mm sieve passing test, alkali aggregate reaction, clay mass, stability, and impurity content, and it was found to meet the criteria of recycled aggregate quality standards. In addition, the air volume and slump of concrete to which recycled coarse aggregate is applied meet all domestic standards. According to the test results of the compressive strength characteristics by age of concrete according to the mixing ratio of the recycled coarse aggregate, it was confirmed that the mixing ratio of the recycled coarse aggregate was applicable up to 60 %.
Keywords
Recylced aggregate; Recycling construction; Concrete; Recycling; Crusher; Radial turn plate; Impact crusher;
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