Influence of Polyvinyl Chloride (PVC) Waste Addition on the Shear Parameters of Sandy Soil

Abstract

This research paper aims to analyze the impact of adding polyvinyl chloride (PVC) waste on the engineering properties of sandy soil, focusing on improving weak soil and exploring beneficial applications for plastic waste. Laboratory tests were conducted on sandy soil samples mixed with varying percentages of PVC waste, specifically 0%, 0.25%, 0.5%, 1%, 2%, and 4% by weight. The tests included sieve analysis, specific gravity determination, standard Proctor compaction test, and direct shear test. These tests were designed to evaluate the effect of PVC addition on grain size distribution, density, compaction characteristics, and shear parameters of the soil. The results demonstrated an improvement in soil properties with the addition of specific PVC percentages. An increase in maximum dry density and enhanced compaction characteristics were observed within the range of 1% to 2% PVC. Direct shear tests also revealed an increase in the angle of internal friction and cohesion within this range. However, exceeding 2% PVC content led to a deterioration in some soil properties, indicating the existence of an optimal addition ratio, determined to be approximately 1.5% of the dry soil weight. This study provides new insights into using PVC waste for soil improvement, contributing to the resolution of weak soil issues in construction areas while offering an innovative solution for recycling plastic waste.