預處理含鋁金屬混燒飛灰作為控制性低強度材料 (CLSM)之穩定性研究

Using solid recovered fuel (SRF) to reduce fossil fuel (Coal) consumption is an efficient energy transition strategy in the trend toward net zero carbon emissions. However, the high heterogeneity of solid recycled fuels causes changes in the properties of co-combustion fly ash and may result in residual metallic aluminum in the ash. When co-combustion fly ash containing metallic aluminum is mixed with cement, hydrogen gas will be generated and cause expansion of the mixture. This study developed a method to quantify the content of metallic aluminum by measuring the amount of hydrogen generated by the reaction of metallic aluminum powder in alkaline solution. A pre-treatment of the co-combustion fly ash by immersion in water was evaluated as a means to remove metallic aluminum in the ash. The results showed that the pre-treatment can effectively reduce the aluminum content in the co-combustion fly ash, and the effects are more pronounced as the duration of immersion increases. With a 7-day water immersion, the aluminum content in the fly ash was successfully reduced and gas generation eliminated, with negligible expansions when using the co-combustion fly ash in controlled low strength materials (CLSM).