Research on the alkalinity reduction of solid waste eco-concrete
The alkalinity of solid waste eco-concrete plays a crucial role in determining plant growth.This study utilizes various solid waste materials to prepare eco-concrete,including carbonized steel slag,steel slag micropowder,fly ash and desulfurized gypsum.Three meth-ods are employed to reduce the alkalinity of solid waste eco-concrete:carbonation treatment,silicone spraying and a combination of carbonation treatment and silicone spraying.It then analyzes the effects of these three alkalinity reduction methods on the compressive strength and alkalinity of solid waste eco-concrete.The findings reveal that both carbonization treat-ment and silicone spraying can effectively reduce the alkalinity to some extent and slightly improve the concrete's compressive strength at the same time.When carbonization treat-ment is employed,rapid carbonization exhibits better results in terms of alkalinity reduction compared to natural carbonization,yielding optimal compressive strength and alkalinity lev-els during the 7-day rapid carbonization process.When silicone spraying is employed,two rounds of spraying results in superior compressive strength and alkalinity levels.Combining a 7-day rapid carbonization with two rounds of silicone spraying achieves the best results of reducing pH value to approximately 9.3 while increasing compressive strength by 10％～20％.
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