Study on Environmental Utilization of Flyash Cement

煤燃烧产生大量的粉煤灰。目前，日本约有55%的粉煤灰得到利用，其残留物被倾倒在处置地点；然而，这些网站的寿命是有限的。因此，本研究对粉煤灰水泥的衬砌材料进行了分析，作为粉煤灰水泥回收利用的一部分。当粉煤灰掺入硅酸盐水泥时，加入了与水泥相同种类的氧化物。粉煤灰作为一种注入组分，一方面作为一种细骨料，具有与易滑塌岩石的细碎屑材料相似的功能，另一方面作为一种粘结组分。从这些角度出发，为了弄清粉煤灰掺量对衬砌材料性能的影响程度，通过流动性试验、无侧限压缩试验、软化指标试验等室内试验，考虑了粉煤灰、硅酸盐水泥和水的不同组合。同时，通过室内试验和数值计算方法，对粉煤灰作为回填材料在矿山工程领域的应用进行了分析，分析了粉煤灰作为路基衬砌材料时易滑塌岩质边坡的稳定性。

A large amount of flyash from the coal combustion is produced. About 55% of flyash in Japan is now utilized and the remains are dumped at disposal sites; however, the life of these sites is limited. Therefore, in this study, an effort was made to analyze the lining materials by applying flyash cement as a part of its recycle and utilization. When flyash is added to Portland cement, the same kinds of oxides as those of the cement are added. As an injection component, flyash acts, in part, as a fine aggregate which has similar function to fine debris materials of slake-prone rock and, in part, as a binding component.From these points of view, in order to clarify to what degree the flyash content affects the properties of the lining materials, some different combinations of flyash, Portland cement and water were considered by means of several laboratory experiments, such as a fluidability test, unconfined compressive test, slaking index test and so on. Also, the utilization of flyash as backfilling materials in the mining engineering fields by means of laboratory testing and a numerical method was applied to analyzing the slake-prone rock slope stability when the mixtures are implemented as lining materials of the embankment.