主催: Japan Society of Material Cycles and Waste Management
This study aims to recycle FA as a soil amendment material to improve water holding capacity of the soil, which might solve both FA management problem and desertification problem at the same time. The authors investigated the effect of raw coal fly ash amendment on water holding capacity (WHC) of decomposed granite soil (DGS) and akatama soil (AS). Soil particle size dependency of FA amending effect was focused on. Drying experiments were conducted at room temperature and 40 ºC. The weights of the samples were measured every hour to monitor water retention. The experiments were repeated three times to check experimental errors. One-sided Welch's t-test with 5% significance level was used to check the significant differences in data. The results showed that the relationship between the particle size and WHC was non-linear. Highest WHC appeared in certain range of particle size and it depended on soil type. WHC of both pure soils and FA-amended soils have size dependency. In some cases, WHC differences among different size ranges are regarded as statistically significant by Welch’s t-test. In addition, the size dependency of WHC also depends on the temperature.
