| 摘要 |
PROBLEM TO BE SOLVED: To provide concrete for wet-spraying where coal ash from a thermal power station is used as one of raw materials, by which a good spraying work is performed and which has a stable conveying property and strength. SOLUTION: When the concrete for spraying is prepared by kneading cement, coal ash, aggregate and water without a fluidizing agent, the total blending amount of the cement and the coal ash per concrete for spraying of 1 m<SP>3</SP>is regulated to 380-420 kg and the blending ratio of the cement to the coal ash is made as 75:25-65:35. As stable conveying and smooth spraying can be performed without pulsation or plugging in a concrete supplying pipeline, required initial strength and a long-term strength are obtained. COPYRIGHT: (C)2005,JPO&NCIPI
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