高強度コンクリートの遠心成形性に及ぼす調合の影響に関する研究

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The study on the influence of mix proportion of high strength concrete on the segregation of coarse aggregate and sludge formed during centrifugal compaction is reported here. First, the influence of mix proportion conditions, such as the type of superplasticizer and silica fume used and the water cementitious material ratio, on the rheological characteristics of high strength concrete paste was studied. Next, experiments were conducted on sludge generated while mixing various kinds of materials during the centrifugal compaction of high strength concrete. The results of the experiments showed that the plastic viscosity of paste increases as the water cementitious material ratio decreases. Moreover, the dewatering effect decreases, and sludge does not form easily. It was verified by measuring the quantity of sludge generated and by analyzing the cut surface of the centrifugal compaction test specimens that the smaller the quantity of high strength concrete paste, the more effective is the generation of sludge and the segregation of coarse aggregate.
2006-08-30