1. Abu-Saleem, M., Zhuge, Y., Hassanli, R., Ellis, M., Rahman, M., & Levett, P. (2021). Microwave radiation treatment to improve the strength of recycled plastic aggregate concrete. Case Studies in Construction Materials, 15(e00728), 7.
2. ACI: 211.1-91, (reapproved 2002)—Standard practice for selecting proportions for normal, heavyweight, and mass concrete. American Concrete Institute.
3. Akinyele, J. O., Salim, R. W., & Oyeti, G. (2014). Use of recycled polypropylene grains as partial replacement of fine aggregate in reinforced concrete beams. Engineering Structures and Technologies, 6(4), 184–190.
4. ASTM. (2018). Standard specification for concrete aggregates. ASTM C33/C33M-18, ASTM International West Conshohocken, PA.
5. ASTM. (2013a). Standard test method for sieve analysis of fine and coarse aggregates. ASTM C136/C136M-13, ASTM International West Conshohocken, PA.