Effect of polypropylene plastic on concrete properties as a partial replacement of stone and brick aggregate

Comparative Study of Concrete with Polypropylene and Polyethylene Terephthalate Waste Plastic as Partial Replacement of Coarse Aggregate

“…With maximum 15% PET aggregate replacement, the reduction in density was 5.6%. Islam and Shahjalal [21] also found a linear reduction of hardened density with PP replaced concrete. Up to 8.4% and 7.4%, the reduction was observed for concrete with 30% PP aggregated compared to control concrete with stone and brick aggregates.…”

“…A significant number of studies have already been conducted, where various types of plastic waste, recycled plastic waste [8], high-density polyethylene (HDPE) [9], polyethylene terephthalate (PET) [10][11][12][13][14][15][16][17][18], polypropylene (PP) [19][20][21][22][23][24], polyvinylchloride (PVC) [25], and E-plastic [26], were used. Plastic aggregates are used as a cementitious material [22], as a fine aggregate [10-13, 15, 17, 18], or as coarse aggregate [14,21,23], or fiber in concrete composites [27]. Plastic replacement percentages vary between 0% and 100%.…”

“…Researchers have found increased workability with increasing PET and PP content in the concrete mix [10,14,21]. Choi et al [10] and Choi et al [11] utilized waste PET aggregate to replace river sand and observed increased slump values for concrete with PET.…”

“…Islam et al [14] found that the smooth surface and round shape of the PET aggregates helped improve the workability of the concrete. Islam and Shahjalal [21] applied PP coarse aggregate to replace stone and brick coarse aggregate partially. ey found that slump value increased with increased PP content irrespective of the w/c ratios.…”

“…Waste plastic has a relatively higher specific gravity than virgin plastic. However, the specific gravity of the waste plastic is still lower than the natural aggregates used in concrete [14,21]. erefore, replacing those ingredients with plastic can reduce concrete's unit weight.…”