| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic joint having excellent workability, hardly causing shrinkage even after working and having excellent acid resistance. SOLUTION: The hydraulic joint contains an aggregate and the alumina cement in which particles having <=5μm particle size is <=25 wt.% in the ratio of alumina cement/aggregate =(30/70)-(50-50) by weight ratio, and particle size of >=75 wt.% particles of all contained in organic particles exceeds 5μm.
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