Effect of self solidification on mechanical properties of incineration residue from manicipal solid waste.

日本城市垃圾填埋场剩余寿命逐年递减填埋固体废物的主要成分是底灰、飞灰等焚烧残渣。另一方面，天然集合体会耗尽。因此，应对固体废物进行再利用和循环利用，以延长填埋场的使用寿命，防止环境退化。焚烧残渣是不稳定的，因为底灰的化学和矿物学特性随着时间的变化而变化。因此，必须弄清底灰随时间变化的力学特性，才能有效地利用底灰。为研究含水率对长期风化底灰的强度和变形特性的影响，进行了不同含水率的土体不同强度试验、三轴剪切试验和不排水循环剪切试验。底灰在3种不同的条件下固化，(1)湿状态，(2)浸泡…更多的ED条件，以及(3)特定时期的暴露条件。根据土力学试验(JGS)确定了底灰的力学特性。重点讨论了底灰用作建筑材料时的地基条件和龄期。这些试验研究的主要结果如下：(1)从击实结果、CBR试验表明，底灰作为基层材料可以得到有效利用。(2)在暴露和湿养条件下，底灰的无侧限抗压强度随历时天数的增加而增加。这一原因似乎是标本的自固化。3)在三轴剪切试验中，低围压条件下，养护方式对底灰的强度和变形特性有一定的影响。但在高围压下，试件的强度下降，无论采用何种养护方法，试件都会出现收缩现象。(4)养护方法和养护时间对底灰的循环强度有一定的影响。在底灰复垦的情况下，复垦场地在地震时需要采取防止液化的措施。较少

The remaining life of the municipal waste landfill decreases year by year in Japan. The main component of landfilled solid waste is the incineration residue such as bottom ash and fly ash. On the other hand, the natural aggregates get exhausted. Therefore, the solid wastes should be reused and recycled to prolong the life oflandfill site and to prevent the environmental degradation. Incineration residue is unstable since the chemical and mineralogical characteristics of bottom ash changes with time. Therefore, the mechanical characteristic of bottom ash with time must be clarified for a effective utilization. In this study, a series of soil tests such as uncon-fined compression tests, triaxial shear tests, and undrained cyclic shear tests were carried out to in-vestigate the effect of water content on the strength and deformation characteristics of bottom ash which were weathered for a long period. The bottom ashes were cured under 3 different conditions, (1) wet condition, (2) submerg … More ed condition, and (3) exposure condition for a specific period. The mechanical characteristic of bottom ash was determined in accordance with the soil mechanics test (JGS). The focus point of the discussion was on the ground conditions and the curring period of bottom ash when used as construction materials.The main results of these experimental researches were follows ;(1) It is indicated that the bottom ash can be utilized effectively from the result of compaction, CBR test as a ground material.(2) In exposure and wet curing, the unconfined compressive strength increases with increasing elapsed days. This reason seems to be the self-solidification of the specimen. The self-solidification is different depending on the curing method.3) In the triaxial shear test, low confining pressure, the effect of the curing method appeared in strength and deformation characteristic of bottom ash. However, the strength of specimen deceases at high confining pressure, and the contraction behavior appears regardless of the curing methotl It also clarified that the self-solidification in the specimen disappeared with the increase in the confining pressure.(4) The cyclic strengths of the bottom ash is influenced by curing method and elapsed time. In the case of the reclamation by bottom ash, the reclamation ground needs to take measure against liquefaction during the earthquake. Less