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Development of a Double Coating Technique for Recycled Concrete Aggregates Used in Hot-mix Asphalt

Authors: Abbaas I. Kareem, H. Nikraz

Abstract:

The use of recycled concrete aggregates (RCAs) in hot-mix asphalt (HMA) production could ease natural aggregate shortage and maintain sustainability in modern societies. However, it was the attached cement mortar and other impurities that make the RCAs behave differently than high-quality aggregates. Therefore, different upgrading treatments were suggested to enhance its properties before being used in HMA production. Disappointedly, some of these treatments had caused degradation to some RCA properties. In order to avoid degradation, a coating technique is developed. This technique is based on combining of two main treatments, so it is named as double coating technique (DCT). Dosages of 0%, 20%, 40% and 60% uncoated RCA, RCA coated with Cement Slag Paste (CSP), and Double Coated Recycled Concrete Aggregates (DCRCAs) in place of granite aggregates were evaluated. The results indicated that the DCT improves strength and reduces water absorption of the DCRCAs compared with uncoated RCAs and RCA coated with CSP. In addition, the DCRCA asphalt mixtures exhibit stability values higher than those obtained for mixes made with granite aggregates, uncoated RCAs and RCAs coated with CSP. Also, the DCRCA asphalt mixtures require less bitumen to achieve the optimum bitumen content (OBC) than those manufactured with uncoated RCA and RCA-coated with CSP. Although the results obtained were encouraging, more testing is required in order to examine the effect of the DCT on performance properties of DCRCA- asphalt mixtures such as rutting and fatigue.

Keywords: Recycled concrete aggregates, hot mix asphalt, double coating technique, aggregate crashed value, Marshall parameters.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1474797

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References:


[1] De Juan, M. S. and P. A. Gutiérrez, Study on the influence of attached mortar content on the properties of recycled concrete aggregate. Construction and Building Materials, 2009. 23(2): p. 872-877.
[2] Zhu, J., et al., Investigation of asphalt mixture containing demolition waste obtained from earthquake-damaged buildings. Construction and Building Materials, 2012. 29: p. 466-475.
[3] Chen, M. J. and Y. D. Wong, Porous asphalt mixture with 100 % recycled concrete aggregate. 2013. 14(4): p. 921-932.
[4] Pasandín, A. R. and I. Pérez, Mechanical properties of hot-mix asphalt made with recycled concrete aggregates coated with bitumen emulsion. Construction and Building Materials, 2014. 55: p. 350-358.
[5] Hou, Y., et al., Laboratory investigations of activated recycled concrete aggregate for asphalt treated base. Construction and Building Materials, 2014. 65: p. 535-542.
[6] Li, J., H. Xiao, and Y. Zhou, Influence of coating recycled aggregate surface with pozzolanic powder on properties of recycled aggregate concrete. Construction and Building Materials, 2009. 23(3): p. 1287-1291.
[7] Bhusal, S. and H. Wen, Evaluating Recycled Concrete Aggregate as Hot Mix Asphalt Aggregate. 2013. 2(1): p. 252-265.
[8] Wong, Y. D., D. D. Sun, and D. Lai, Value-added utilisation of recycled concrete in hot-mix asphalt. 2007. 27: p. 294-301.
[9] Lee, C.-H., J.-C. Du, and D.-H. Shen, Evaluation of pre-coated recycled concrete aggregate for hot mix asphalt. Construction and Building Materials, 2012. 28(1): p. 66-71.
[10] Pasandín, a.R. and I. Pérez, Laboratory evaluation of hot-mix asphalt containing construction and demolition waste. Construction and Building Materials, 2013. 43: p. 497-505.
[11] Pan, Z.-Y., et al., Modified recycled concrete aggregates for asphalt mixture using microbial calcite precipitation. RSC Adv., 2015. 5(44): p. 34854-34863.
[12] Standards;, A., Particle density and water absorption of fine aggregates, in AS 1141.5. 2000, Standards Australia: NSW, Australia p. 1-10.
[13] Australia;, S., Particle density and water absorption of corase aggregates-weighing in water method in AS 1441.6.1. 2000, Standards Australia: NSW, Australia. p. 1-10.
[14] Australia;, S., Los Angeles value, in AS 1141.23. 2009, Standards Australia: NSW, Australia. p. 1-14.
[15] Bhusal, S., X. Li, and H. Wen, Evaluation of Effects of Recycled Concrete Aggregate on Volumetrics of Hot-Mix Asphalt. Transportation Research Record: Journal of the Transportation Research Board, 2011. 2205(-1): p. 36-39.
[16] Australian/New Zealand Standards, Compaction of asphalt by Marshall method and determination of stability and flow-Marshall procedure, in AS/NZS 2891.5-2015. 2015, Standards Australia/Standards New Zealand: Sydney, NSW. p. 1-17.
[17] Standards Australia, Hot mix asphalt-A guide to good practice, in AS 2150-2005. 2005, Standards Australia: Sydney. p. 1-50.
[18] MRWA, Asphalt Wearing Course, in Specification 504. 2017, Main Roads Western Australia: Perth, WA.