PROBLEM TO BE SOLVED: To provide a solidification material capable of solidifying an object to be solidified such as soft ground to a sufficient strength at a low cost, and to suppress hexavalent chromium contained in the object to be solidified such as cement and soil of the solidification material from being eluted from the object to be solidified after solidification.
SOLUTION: The solidification material contains cement, a waste plaster and a roast ash of an industrial waste produced by performing roasting under an atmosphere of a low concentration of oxygen at a temperature of 1,000-1,100°C. The cement is made to 25-45 wt.%, the waste plaster is made to 10-50 wt.% and the roast ash is made to 10-50 wt.%. More preferably, the cement is made to 30-40 wt.%, the waste plaster is made to 15-40 wt.% and the roast ash is made to 20-45 wt.%.
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