Abstract
Mechanical properties of recycled concrete aggregates (RCA) such as compaction and California bearing ratio (CBR) are important for application as unbound road base and subbase materials. Limited studies, however, have examined the effects of the nominal maximum particle diameter (Dmax) of aggregates and fines content (Fc; < 0.075 mm). Also, particle rearrangement and breakage depend on water content (w) (i.e., water states of aggregates) under the compaction process. In this study, therefore, a series of compaction and CBR tests at different compaction energies (Ec) and w was carried in the laboratory using graded RCA with Dmax of 25 mm and 37.5 mm and four different Fc ranging from 0 to 20%. The results showed that the compaction properties of RCA were controlled by Ec and w. Based on the analysis of water states of aggregates, it can be understood that water existed in the capillary region for maximum dry density and existed at the boundary between capillary and hygroscopic regions for minimum dry density. The maximum measured CBR values were attained at Fc = 5% for both Dmax of 25 mm and 37.5 mm. The breakage of samples became enhanced with increasing Ec and weakened with increasing Fc.
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Acknowledgements
This research was supported by the project of Japan Science and Technology Agency (JST)—Japan International Cooperation Agency (JICA) on Science and Technology Research Partnership for Sustainable Development (SATREPS) (No. JPMJSA1701).
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Appendix
Appendix
Chemical components of tested RCA were determined using energy-dispersive X-ray fluorescence spectrometer based on fundamental parameter method (FP-EDX) are given in Table A1. Water and acid extractable heavy metals are given in Table A2. A summary of measured compaction parameters and CBR is given in Table A3 with the technical requirements of recycled aggregates for road base and subbase materials in Vietnam and Japan.
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Thai, H.N., Nguyen, T.D., Nguyen, V.T. et al. Characterization of compaction and CBR properties of recycled concrete aggregates for unbound road base and subbase materials in Vietnam. J Mater Cycles Waste Manag 24, 34–48 (2022). https://doi.org/10.1007/s10163-021-01333-1
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DOI: https://doi.org/10.1007/s10163-021-01333-1