Study on Environmental Utilization of Flyash Cement

煤燃烧产生大量的飞灰。在日本，大约55%的飞灰现在被利用，剩余的飞灰被倾倒在处置场;然而，这些场地的寿命是有限的。因此，在这项研究中，努力分析的衬砌材料，应用粉煤灰水泥作为其回收和利用的一部分。当粉煤灰加入到波特兰水泥中时，加入了与水泥中相同种类的氧化物。粉煤灰作为一种喷射组分，一方面作为细集料，其功能类似于易崩解岩石的细碎屑材料，另一方面作为粘结组分。从这些观点出发，为了阐明粉煤灰含量对衬砌材料性能的影响程度，通过几个实验室实验，考虑了粉煤灰、波特兰水泥和水的一些不同组合。通过流变性试验、无侧限抗压试验、崩解指数试验等，并结合粉煤灰在采矿工程中的应用，通过室内试验和数值计算方法，分析了粉煤灰混合料作为路堤衬砌材料时易崩解岩质边坡的稳定性。

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.