No abstract

Although reusable materials in a construction project need to be specifically managed by the head office of the construction company for proper retrieval and reuse, they are not efficiently managed. In many cases, construction companies treat reusable materials no differently from non-reusable materials. To manage reusable materials for effective and efficient procurement, the current procurement system needs to be improved based on the records of usage from multiple projects monitored and managed by the head office of the construction company. The objective of this paper is to discern and analyze the problems of the procurement process of reusable materials for current multiple projects by following case studies of three construction companies against this background. Based on the analysis, this paper emphasizes the need to implement systems for reusable materials procurement requests, outgoing materials quantity forecasts, and economic analysis for vehicle distribution, as well as the need to expand applicable uses of a resource pool. A model is also proposed to support the decision-making process in the procurement of reusable materials.

A Ab bs st tr ra ac ct tSince the cases of time extension have continuously transpired in the public construction project, the potential of economical loss and claims is increasing because the concerned parties such as an owner or a contractor have not properly performed their own responsibility for time extension. One of the main reasons is that the present planning and scheduling do not support the method to apportion the proper responsibility to the right party. This problem has repeatedly led to time extension and made it difficult for the concerned parties to perform the responsibility for time extension. In order to overcome this problem, a framework of delay administration is required as the method to apportion the proper responsibility to the right party. To solve this problem, this paper aimed to develop the conceptual model and prototype system as the practical method to administrate delay causation. Furthermore, the verification result for the reliability and applicability throughout the case studies on real construction projects shows that the conceptual model and prototype system developed would help efficiently to administrate the delay causation.

safety of workers and structural stability of building. Therefore, we need a step to develop a assessment system, verify and make specified. This paper evaluated how much improve on construction speed, work efficiency, intensity of work and influence with another process comparing the existing method with the new demolition method. The qualitative and quantitative assessment system are developed with these output. The case study was carried out experimental group and control group, based on developed assessment system, which have the same condition. The existing method was made up of 3 steps-1)Demolish windows, doors and iron goods, 2)Demolish indoor and outdoor walls, 3)Drop the waste. The new demolition method was made up of 5 steps-1)Demolish windows, doors and iron goods, 2)Demolish the ceiling and wall's finishing materials, 3)Demolish the floor's finishing materials, 4)Demolish indoor and outdoor walls, 5)Drop the waste. Work time, idle time, the character of a work unit are analyzed by mock-up test. This study's output is expected to establish a systematic process of new demolition method and based on the maximizing waste recycling work in our construction industry.