Analysis of Concrete Compressive Strength by Adding Plastic Waste as an Additional Material Mixed in Cement for Manufacturing Pavling Blocks

Abstract

In daily life, plastic waste feels very close to us as humans. This type of waste is very difficult to decompose,
which significantly disrupts both life on land and in the ocean. In this study, the use of heated plastic waste as an additive in
cement mixtures for making paving blocks is still rarely explored. The aim of this research is to examine the impact of using
plastic waste as an additive in cement mixtures. Additionally, the use of plastic waste as an additive in cement is based on the
idea that plastic waste can be transformed into something useful to reduce the troubling amount of plastic waste. For this purpose,
this study employs both the Literature Review Method and the Experimental Method to determine how the addition of plastic
waste in paving block mixtures affects the compressive strength of the paving blocks. In this study, plastic waste will be used as
an additive to cement with the following compositions: 0% (ordinary concrete), 2.5%, 5%, and 7% of the cement weight. The
results showed that paving blocks with a 2.5% plastic mixture achieved the highest compressive strength of 26.2 MPa at 21 days,
while the highest water absorption was observed in the 5% plastic mixture, with a value of approximately 6.14%. Overall, the
total strength exceeded the planned compressive strength of 20 MPa based on the SNI 03-0691-1996 standard, making it suitable
for road use with a B quality grade.