| 摘要 |
PURPOSE:To provide the method for centrifugal-molding concrete by which the finished property of the inside surface of the obtained concrete molding product, the workability and the dehydration property are improved and the productivity can be enhanced. CONSTITUTION:A concrete material is kneaded and cast in a mold frame and then the mold frame is rotated at a low speed, thus the concrete material is uniformly filled. Thereafter the mold frame is rotated at a middle speed and subsequently is rotated at a high speed, thus in the concrete centrifugal molding method including the process in which the concrete material is molded and compacted, a polyacrylamide partially hydrolyzed product which has 300,000-1,000,000 molecular weight and 5-35% hydrolysis ratio, is added to the concrete material, before the above described high speed rotation is performed after the kneading. |
