Department of Civil and Environmental Engineering, National University of Kaohsiung, Kaohsiung 811, Taiwan, ROC.
Waste Manag. 2010 Jul;30(7):1303-9. doi: 10.1016/j.wasman.2009.11.010. Epub 2009 Dec 14.
The mechanical properties, including strength, deformational behavior, and wetting softening phenomena of municipal solid waste incinerator (MSWI) bottom ash are one of the major concerns for reuse applications. However, owing to the complex constituents of municipal solid waste, the properties of MSWI bottom ash are often highly variable. A series of artificial specimens with controlled chemical components were tested in this study. The test results show that the artificial bottom ash possesses the following mechanical characteristics: (1) for the strength, the frictional angles of the bottom ash under dry and saturated conditions vary from 34.8 degrees to 51.1 degrees and 26.0 degrees to 37.2 degrees, respectively; (2) for the deformation, the shear stiffness increases with the normal stress arises and degrades upon increased shearing; (3) significant wetting degradation of the strength and stiffness were observed. The multi-variable regression analysis was conducted to evaluate the associated influence of the chemical components on the strength. Among the evaluated components, Fe(2)O(3) and Al(2)O(3) are key factors; an increase in either results in higher strength at both dry and saturated conditions. The results were used to propose empirical relationships for phi(dry) and phi(sat), expressed in terms of Fe(2)O(3) and Al(2)O(3). Accordingly, a strength classification chart is proposed for engineering purposes.
垃圾焚烧厂底灰的力学性能，包括强度、变形行为和润湿软化现象，是再利用应用的主要关注点之一。然而，由于城市固体废物的组成复杂，底灰的性质通常变化很大。本研究中测试了一系列具有控制化学成分的人工样本。试验结果表明，人工底灰具有以下力学特性：(1)对于强度，干燥和饱和条件下底灰的摩擦角分别为 34.8 度至 51.1 度和 26.0 度至 37.2 度；(2)对于变形，剪切刚度随正应力的增加而增加，并随剪切的增加而降低；(3)观察到强度和刚度的显著湿降解。进行了多元回归分析，以评估化学成分对强度的相关影响。在所评估的成分中，Fe(2)O(3)和 Al(2)O(3)是关键因素；这两种物质含量的增加都会导致干燥和饱和条件下的强度提高。结果用于提出以 Fe(2)O(3)和 Al(2)O(3)表示的 phi(dry)和 phi(sat)的经验关系式。因此，提出了一个用于工程目的的强度分类图表。
