| 摘要 |
PROBLEM TO BE SOLVED: To provide a self-collapse type cured body of which the material is easily secured, and which is allowed to be surely self-collapsed, and to provide a method for feeding earth and sand using the self-collapse type cured body. SOLUTION: This invention relates to the self-collapse type cured body, wherein a cement composition wherein the main component of a binding material consists of three components of portland cement and/or eco-cement, alumina cement and gypsum, mixed with water and the mixture is cured. In the cement composition, based on the alumina cement mass of 2 to <25 pts.mass, the mass of the portland cement and/or eco-cement is 2 times to <36 times, and also, the mass of the gypsum expressed in terms of anhydride is≥1.5 times. COPYRIGHT: (C)2010,JPO&INPIT
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