Characterization of Coarse Recycled Aggregates Produced from Concretes with Different Strength Levels

Year 2022, Volume: 5 Issue: 1, 38 - 46, 30.06.2022

Hojjat Hosseinnezhad , Erdoğan Tosun Özge Çakır , Kambiz Ramyar

https://doi.org/10.38061/idunas.851831

Cited By: 2

Abstract

With the acceleration of Urban Renewal Program, particularly in large cities of Turkey, the problem of finding land-fills and eliminating construction waste with the least environmental pollution necessitates its value-added recycling. However, the presence of adhered weak mortar layer, comprising 20-70% of recycled concrete aggregate (RCA), limits the use of RCA or lowers its inclusion level in concrete mixtures. Within the scope of this study, limestone- and basalt-bearing RCA obtained from 6 different concrete mixtures with three different water/cement ratios (0.45, 0.60, 0.70) were prepared and their water absorption, specific gravity, dense and loose unit weight, flatness indices, Los Angeles degradation values were determined. The results showed that, increasing w/c ratio of the parent concrete increased water absorption of the resultant RCA. However, the specific gravity, unit weight, abrasion resistance and flakiness index of RCA were decreased by increasing w/c ratio of the parent concrete.

Keywords

recycled concrete aggregate, parent concrete strength level, water absorption, degradation resistance, flakiness index

Supporting Institution

Scientific and Technological Research Council of Turkey (TÜBITAK)

Project Number

119R037

Thanks

The authors would like to acknowledge the financial support provided by TÜBİTAK under grant No: 119R037.

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