Integration of Offsite and Onsite Schedules and Quantifying Advantages in Modular Construction interms of Waste Generation (A Case Of Some Selected construction Sites In Hawasa and Shashemene town

Abstract

Modular construction projects enables higher schedule control of construction projects due the inherent concurrency of offsite and onsite construction operations and has increasingly gained momentum internationally due to its numerous benefits that include, but are not limited to, waste minimization, safe construction, quality improvement, and productivity enhancement. This project done in Hawassa and shashemene town construction expert focuses on concurrency of offsite and onsite integrated scheduling methodology that avoid schedule risks and result in construction material waste reduction and compare waste generation of modular and conventional to quantify these differences. The framework relies on Pre and exit interviews, questionnaires, observations and secondary data sources was carried out in collaboration with mainly Hawassa industry park Engineering and maintenance Department , China communications construction company Toga camp and construction expert of two town municipality. The questionnaire focused on two issues: (1) Integrated scheduling of offsite and onsite in modular construction with the aims of minimizing construction waste , and (2) to compare waste generation amount of properly scheduled modular construction and conventional (onsite) construction . For the latter issue, effort was made to address two factors that emanated on schedule risks and waste generation minimization of modular construction .A procedure for integrating offsite and onsite construction was introduced based on the best proposed scheduling methodology and Critical chain project management with linear scheduling method was perceived as a viable method that take into account schedule risks to reduce waste to improve sustainability and comparing construction waste generation between two construction method .The findings of excel data analysis result and comparison of waste amount for two construction method indicate that Integrated scheduling critical chain project management with linear VI scheduling method solve integrate schedule risks and modular construction reduced the overall weight of waste by up to 81.3% and 83.2%, for two cases considered. This reduces the research gap of best scheduling method that avoid integrate schedule risks of onsite and offsite in modular construction to minimize construction waste and provides thoroughly examined result for future research, while also improving the knowledge of industry stakeholders, informing them of the benefits of critical chain project management with linear scheduling method of modular construction. This allows stakeholders to make more informed decisions when selecting an appropriate construction method to minimize material waste