Abstract
For solid waste disposal and cement consumption reduction, sustainable phosphate-based rapid repairing materials (sust-MPC) were prepared with MgO-containing by-products (LG-MgO) and circulating fluidized bed (CFB) fly ash. The effects of various mix proportions on the fluidity, setting time and mechanical properties of sust-MPC were investigated. Based on that, mix proportion optimization procedure has been developed according to the multi-objective comprehensively considering. The results showed that the MgO to KDP ratio (M/P) was the most influential parameter on the fluidity, whereas the Borax dosage (B/MPF) and Water-to-binder ratio (W/MPF) were the dominant factors on the setting time and 1-h mechanical properties, respectively. Yet, the effect of CFB fly ash addition (CFB/MPF) was relatively small. Finally, the performance comparisons of sust-MPC and conventional MPC were carried out. Examined properties included basic properties, adhesion strength and microstructure, etc. Overall, sust-MPC has shown a better behavior. These positive results indicated that sust-MPC could be a promising alternative in developing sustainable construction material and waste management as well.
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