Change of Mechanical Properties during Short-Term Natural Weathering of MSWI Bottom Ash

详细信息    查看全文

• 作者：J. M. Chimenos ; A. I. Ferná ; ndez ; L. Miralles ; J. R. Rosell ; and A. Navarro Ezquerra
• 刊名：Environmental Science & Technology
• 出版年：2005
• 出版时间：October 1, 2005
• 年：2005
• 卷：39
• 期：19
• 页码：7725 - 7730
• 全文大小：258K
• 年卷期：v.39,no.19(October 1, 2005)
• ISSN：1520-5851

文摘

The present work describes the change of mechanicalproperties during the natural weathering of freshly quenchedprocessed bottom ash. An unconfined uniaxial compressionto failure test of the unbound material was used todetermine compressive strength and modulus of elasticity.Three main stages of mechanical behavior were determined.In the first stage, during a period lower than 30 days,mechanical properties suddenly increase, with a compressivestrength and elastic modulus 7 times greater than theinitial parameters. During the second stage, compressivestrength and modulus of elasticity lightly increase untilapproximately 90 days of curing time. Starting from thisperiod both mechanical properties remain steady andindependent of the curing time. The neoformed phases,the elevated water content, and the improvement of particlecontact after compaction act as a binder layer amongparticles, increasing the mechanical parameters during theshort-term natural weathering process. Because of this,the freshly compacted bottom ash progresses from behavingas an unbound material into a bound pavement material.These mechanical properties obtained from freshly quenchedbottom ash are 6-7 times greater than those obtainedfrom previously weathered bottom ash. The bottom ashexpansion and leaching of metals were also evaluated.