Workability and compressive strength of concrete reinforced by plastic waste concrete aggregates

Anen, Marvrick (2022) Workability and compressive strength of concrete reinforced by plastic waste concrete aggregates. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The reduction of natural aggregates, regardless of the increase in demand for structural construction, is a growing problem globally. On the other hand, the increasing accumulation of plastic waste is another major problem facing human beings worldwide. However, the low interaction between plastic aggregates with organic cement lowers the strength of concrete to is a major concern that needs further addressing. Using modified plastic waste in composite form as a construction aggregate is wise to solve both problems. M20 mixed concrete with total replacement of native aggregate with composite plastic aggregate (PCA) at different ratios (10 wt%, 15 wt%and 20 wt%) was studied. M20 mixed concrete is produced by hand, according to BS EN 12390: 3: 2000. Then, the level of workability and compressive strength of the composite were determined using a slump test and compression test using a UTM machine referring to the BS standard of EN 2390-3: 2019 and BS EN 12390: 3: 2000, respectively. The results were used to compare the properties of PCA -based concrete with concrete made of 100% natural aggregate and 10% waste plastic aggregate (PWA). It was found that PCA concrete using 10 wt% showed a slump value of 27 mm and compressive strength of 29 MPa, the highest value compared to PWA (only 26 MPa) and PCA filled with 15 and 20 wt%. Experimental data are supported by morphological characteristics and stability of concrete structures through camera images, light microscopy and scanning electron microscopy (SEM). The optimum amount of PCA is proven to produce concrete with good workability and significant compressive strength. All natural aggregate hybrid reinforced concrete and PCA and PWA were confirmed to show a 28 -days compressive strength higher than the standard value of 20 MPa for M20 mixed concrete. It is also proven that PCA aggregate with clay particles can strengthen concrete with an increase of 30% compared to PWA. The findings of this study are significant in contributing to the development of green and sustainable concrete and are very beneficial for the current construction industry.

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