| 摘要 |
PURPOSE: A method for placing concrete using a concrete pumping agent for a portable pump is provided to suppress the amount of waste mortar and to reduce the amount of mortar concrete by sequentially injecting a water dispersion agent and the mortar concrete. CONSTITUTION: A concrete pumping agent for a portable pump contains 35-50 mass% of silica fume, 23-28 mass% of a mineral binder, 14-18 mass% of water soluble resin, and 13-15 mass% of plasticizer. A method for placing concrete comprises: a step of mixing a part of water dispersion solution of mortar with concrete and preparing mortar concrete(13); and a step of sequentially injecting residual water dispersion solution and mortar concrete into a pipe(11) and pumping the concrete. The water soluble resin is methyl cellulose. The mineral binder is blast furnace slag. The plasticizer is melamin-based reversing agent. |
