| 摘要 |
PURPOSE: Provided is a manufacturing method of recycled sand having high strength which is characterized by using wastes such as ash, waste foundry sand, waste concrete, waste aggregate and waste lime. CONSTITUTION: The recycled sand is manufactured by the following methods: (i) mixing 50-70wt.% of waste lime with 30-50wt.% of ash(coal ash, incineration ash), wherein the ash is mixed with cement and calcined gypsum in a weight ratio of 30-70:70-30; (ii) mixing 50-70wt.% of a mixture composed of 10-35wt.% of ash, 30-40wt.% of waste foundry sand neutralized with acid, and 30-50twt.% of waste concrete(aggregate) ground to a 13mm size, with cement and calcined gypsum in a weight ratio of 30-70:70-30, and adding 30-50wt.% of waste lime.
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