DELAYED STATIC CRUSHING AGENT AND METHOD FOR TREATING HEAD OF CONCRETE PILE HAMMERED AT POSITION WITH THE SAME

摘要

PURPOSE:To provide the subject crushing agent attached to a reinforcing steel cage before the application of concrete to facilitate an excessive concrete- removing work by mixing calcined lime, etc., with at least one of a saccharide, an alkali silicofluoride and a specific hydraulic setting material. CONSTITUTION:Calcined lime and/or calcined dolomite are mixed with a combi nation of at least one kind selected from (A) 0.05-5 wt.% (preferably 0.1-2 wt.%)of a saccharide, a polyhydric alcohol and an organic acid (salt), (B) 0.05-10 wt.% (preferably).1-5 wt.%) of an alkali silicofluoride and (C) 1-50 wt.% (prefer ably 5-30 wt.%) of a hydraulic setting material comprising (i) a hydraulic setting material containing 11CaO.7Al2O3.CaF2, (ii) hydraulic setting material containing 12CaO.7Al2O3 and (iii) a hydraulic setting material containing 3CaO.3 Al2O3.CaSO4 to provide the objective crushing agent.