日本地球惑星科学連合2019年大会

講演情報

[E] Eveningポスター発表

セッション記号 A (大気水圏科学) » A-GE 地質環境・土壌環境

[A-GE29] エネルギ・環境・水ネクサスと持続的発展

2019年5月30日(木) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:張 銘(産業技術総合研究所地質調査総合センター地圏資源環境研究部門)、川本 健(埼玉大学大学院理工学研究科)、Jet-Chau Wen(National Yunlin University of Science and Technology)、? 永紅(天津師範大学)

[AGE29-P23] CHECK SHEET SURVEY FOR ESTIMATING CDW GENERATION AND CASH FLOW AT BUILDING DEMOLISHING SITES IN HANOI, VIETNAM

*Cuong Viet Tran1Kawamoto Ken1 (1.Graduate School of Science and Engineering, Saitama University)

キーワード:Construction Demolition Waste (CDW)

Abstract

A number of studies on reuse and recycling of construction demolition waste (CDW) for construction works as well as the properties of building materials using recycled aggregates have been carried out in many developed countries. However, in Vietnam, there are many difficulties to classify and recycle the CDW after demolition construction at site. Because the generation of CDW is increasing in Vietnam due to rapid urbanization and economic growth and CDW was dumped without any quality control of material at disposal site. It is highly demanded to promote the recycling of CDW in a sustainable manner.

In this study, in order to identify the CDW generation and cash flow at actual demolition sites in Vietnam. Firstly, we proposed a check sheet survey to discuss suitable CDW separation and treatment methods. The survey sheet enables to collect data on demolition period, number of labors and equipment, volume of CDW, number of trucks which brought the generated waste from the site, total floor areas, total cost for the demolition work, and so on. Then, using the survey sheet, actual survey works carried out at 3 different building demolishing sites in Hanoi. Finally, utilizing the collected data, we determined waste components and waste generation rates of typical materials such as concrete, brick, valuables (e.g., steel).

Results showed that most CDW generated from demolishing sites was sold to other contractors/buyers for the purpose of construction works (e.g., ground leveling). The generation rates of CDW including valuables varied widely from 0.29 to 1.22 tons/ (m2 of total ground floor) depending on the building type and scale, and smaller building demolition gave a higher generation rate. As a result of cash flow, the estimated cost for selling valuables and CDW masonry to buyers became much higher than those for the contract cost of demolition work from land owner/client.