LIQUID ACCELERATOR

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To provide a liquid accelerator which excels in its accel-erating effect, thick-coating capability, strength develop-ment characteristics and the workability of concrete spray nozzle even for concrete with a relatively low cement content per unit volume, and which also excels in storage sta-bility at low temperatures and high temperatures for a long period of time. A liquid accelerator composed of a fluoride-containing aqueous aluminum complex which is obtained through the re-action of aluminum sulfate and hydrofluoric acid, aluminum hydroxide, and phosphorous acid and/or organic acid salts thereof. © KIPO & WIPO 2007