Abstract
Aiming at the environmental problems caused by waste incineration ash, a reuse solution was proposed to use waste incineration ash and red mud for the preparation of Controlled Low Strength Material (CLSM), to determine the effect of each parameter on the performance of the material by using a one-way test and to determine the reasonable interval of each parameter, and to design the test by using the Box-Behnken Response Surface Method. Three factors, namely, red mud percentage, water-gum ratio, and glue-sand ratio, were used as test variables, and 14d unconfined compressive strength, mobility, and cost were used as response values to optimize the objectives. The heavy metal toxicity and micro-morphology of CLSM were investigated by using microscopic means such as heavy metal leaching concentration, XRD, and FTIR. The results of the study showed that the optimal mixing ratio of CLSM was 0.5 for red mud percentage, 0.667 for water-gum ratio, and 0.45 for gum-sand ratio, which can effectively utilize the waste incineration ash and reduce environmental pollution. It was found that under alkali activation, the red mud-refuse incineration ash cementation system would change and produce new substances, with crystals as the framework and gel as the filling, forming a dense structure.