An Experimental Study on the Engineering Application Using the Bottom Ash of Kaohsiung and Pingtung Incinerators

• Main Authors: Shih-Chung Chen, 陳世鐘
• Other Authors: Ying-Wei Liu
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/81562648197189365576

碩士 === 國立屏東科技大學 === 土木工程系所 === 95 === With increasing bottom ash from incinerated waste in our country, the capacity of existing landfills has become more and more saturated. This could bring significant impact on the local environment. In the past few years, the government has taken effective measures to recycle and reuse waste. It has now become imperative to seek rationalized recycling and reuse of bottom ash. All materials used in this study are bottom ash taken from the garbage incinerators at five waste processing plants, including:Kaohsiung city Central district waste management plant, Kaohsiung city Southern district waste management plant, Kaohsiung county Gangshan district waste management plant, Kaohsiung county Renwu district waste management plant, and Pingtung county Kanding district waste management plant. The purpose of the study is to analyze possible production of Controlled Low-Strength Material (CLSM) made from bottom ash, for reuse as sewerage sludge as a material, subbase, base aggregate, as well as its application in artificial reef ecosystems or lightweight aggregate concrete. Analysis of properties includes sieve analysis, specific gravity and absorption, coarse aggregates – los angeles machine, soundness of aggregate-durability, unit weight test, concrete compression, etc. to compile integral background data of bottom ash from incineration, which will serve as reference for reuse of bottom ash in the future. As shown by the study results, production of CLSM from bottom ash for use as sewage sludge as a material and subbase or base aggregates is feasible, but the initial setting time could not satisfy the requirement. If the initial setting time must be shortened, we may adopt early strength cement or change the Water/Cement ratio. In terms of using bottom ash as a material for artificial reef ecosystem, compression results showed that it did not have the compression required in construction standards. To strengthen its compression, we may add natural coarse and fine aggregates to increase its required strength. The study has also tried the use of bottom ash as lightweight aggregate concrete. As the test results show, the air-drying Unit Weight has been controlled at less than 1850kg/cm3, but since the content of chloride ions in fresh concrete hydration was too high, it could not be used for steel reinforced concrete. Therefore, it remains doubtful whether bottom ash could be used in lightweight concrete.