Evaluating causes of construction waste in East Java Province of Indonesia using RII method

Abstract

Indonesia’s construction industry is still expanding. The construction sector is a major contributor to global waste production. Over 30% of construction waste is disposed of in landfills, leading to a detrimental impact on the environment. This study aims to identify the causes of construction waste in East Java’s Construction industry. The causes of construction waste were divided into two categories: causes of natural material waste and causes of fabricated material waste. Data for this study were collected using the questionnaire. The sample consisted of 32 respondents from medium-to large-scale construction enterprises involved in 4 building construction projects. The method used to identify the dominant waste is mean analysis, meanwhile the causes of construction waste is analyzed using Relative Importance Index (RII) method. The results show that the main cause of natural material waste is inaccurate field measurements resulting in excess volume, and the main cause of fabricated material waste is the cutting of leftover materials that cannot be used anymore. Through the findings the prevention or minimization of construction waste can be carried out according to the causes.