超高強度コンクリートのポンプ圧送性に関する基礎的研究

概要

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From this pumping experiment of ultra-high-strength concrete of Fc150N/mm^2, the change in the performance of fresh concrete and the hardened concrete etc. before and after pumping, the following were presumed. (1) After pumping, the reverse-slump flowing time was showed the tendency to shorten when ultra-high-strength concrete of Fc150N/mm^2 was pumped compared with before pumping. It was thought that some changes occurred to mortar between before pumping and after pumping since this reason was examined with a rotation wing type viscosity meter, and the plastic viscosity of the mortar after pumpimg was decreased. (2) A significant difference was not admitted in the performance of the hardened concrete before and after pumping in this range of the experiment. (3) It was thought that a pressure loss with a low-water-binder ratio concrete was strongly influenced from plastic viscosity by yield value. (4) It is possible to presume roughly that the pressure loss of ultra-high-strength concrete has a correlation to the product of calculated plastic viscosity and the pumping rate in the low-water-binder ratio, in the range 30% or less.
社団法人日本建築学会の論文
2007-12-30