| 摘要 |
PURPOSE:To obtain an accurate gel time, by blending a solution A comprising a reactive bivalent metallic salt with a solution B comprising a specific accelerator and a specific retarder and impregnating into ground. CONSTITUTION:(A) A solution comprising a reactive bivalent metallic salt such as cement, slaked line or gypsum as a main component is blended with (B) a solution containing (I) an accelerator of active alumina salt type containing no bivalent metal such as Ca and Mg, (ii) a retarder such as potassium carbonate or sodium carbonate or salt of organic acid and preferably further (iii) active silica such as fumed silica and impregnated into ground. When the component B is approximately neutral, pozzolan material such as blast furnace slag or fry ash is preferably added to the blend. |
