A study on the long-term stability of cemented bottom ash

• Main Authors: Da-ken Syue, 薛達懇
• Other Authors: Meng-Chia Weng
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/64289475685842538601

碩士 === 國立高雄大學 === 土木與環境工程學系碩士班 === 102 === The mechanical properties of incinerator bottom ash are similar with the well-graded geo-material and easy to obtain. The reutilization of incinerator bottom ash has attracted widespread attention and is now being used in engineering applications in increasingly large quantities. However, according to previous researches, the bottom ash may exist the problem of log-term strength deterioration. Therefore, this study focuses on the long-term stability of cemented incinerator bottom ash. Based on the previous studies, the long-term stability of bottom ash may be related to its chemical composition. The main components of the bottom ash include SiO2、CaO、Al2O3、Fe2O3, and the references indicate the long-term strength decreases may due to the high content of Al2O3. Therefore, this study will explore the influence of Al2O3 on the long-term mechanical properties under different environments. The test results exhibit that as the content of Al2O3 increase in bottom ash, both the uniaxial compressive strength and tensile strength of specimens will decrease. Under different environment, the strength of the specimen in the acid solution is lower than that in the alkali solution. In addition, as the age increases, the strength of specimen will increase. However, after 180 days the strength will decrease. For the deformation of cemented bottom ash, the variation of Young’s modulus is similar to that of strength. In the early period, the modulus increase with age, but after 180 days, it began decrease. Therefore, the long term stability of bottom ash with high Al2O3 is not suitable for engineering application.