Abstract
Disposal of plastic wastes causes negative impacts including degradation of land and ocean and climate change. Reusing plastic wastes in concrete is one of the effective methods of reducing plastic disposal. Polyethylene terephthalate (PET) is one of the most abundantly available plastic wastes as it is commonly used for plastic bottles and food containers. This paper investigates the effects of treating PET wastes using hydrogen peroxide solution (H2O2) and calcium hypochlorite solution (Ca(ClO)2) before incorporating in concrete as coarse aggregate replacements. The physical and mechanical properties of concrete were analyzed for three different percentages, namely, 10%, 20%, and 30%, replacement of natural aggregates with plastic aggregates. For all percentage of replacements, it was found that chemically treated plastic aggregates have no effects on the fresh density, but the slump decreased due to roughened surface of treated plastic aggregates. Chemical treatment improved the bond strength between cementitious matrix and plastic aggregates and reduced the gap at the interfacial transition zone (ITZ). These phenomena contributed to the improvement the compressive strength and lower the permeability and porosity.
Highlights
Disposal of plastic wastes causes negative impacts including degradation of land and ocean and climate change
Polyethylene terephthalate (PET) is one of the most abundantly available plastic wastes as it is commonly used for plastic bottles and food containers. is paper investigates the effects of treating PET wastes using hydrogen peroxide solution (H2O2) and calcium hypochlorite solution (Ca(ClO)2) before incorporating in concrete as coarse aggregate replacements. e physical and mechanical properties of concrete were analyzed for three different percentages, namely, 10%, 20%, and 30%, replacement of natural aggregates with plastic aggregates
According to a statistics done by the National Solid Waste Management Department of Malaysia, plastic wastes are the second largest of the total solid wastes produced in Malaysia [1]. e slow rate of degradation and the large amount of plastic wastes produced by human activities results in large area of landfills are required
Summary
Zoe Harmonie Lee, Suvash Chandra Paul ,1,2 Sih Ying Kong ,1 Susilawati Susilawati, and Xu Yang 3,4. Chemical treatment improved the bond strength between cementitious matrix and plastic aggregates and reduced the gap at the interfacial transition zone (ITZ). E trend identified by research showed that the compressive strength reduced with increasing percentage of plastic aggregates in concrete. Islam et al [11] deduced that the weak bonding at the ITZ between cement paste and plastic aggregates contributed to higher porosity and permeability. Some research has suggested improving the bonds by performing surface modification using chemical treatments on the plastic aggregates. A successful study performed by Naik et al [15] demonstrated that treating plastic using an oxidizing agent could strengthen the bond of plastic to cement, producing concrete with higher strength. Analysis of variance (ANOVA) is performed at 5% significance level to check any significant difference between the means of the groups statistically
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