PRODUCTION OF HIGH-STRENGTH CONCRETE COMPOSITION SIMULTANEOUSLY PROVIDED WITH HIGH FLUIDITY AND MATERIAL SEPARATION PREVENTING PROPERTY AND HIGH-STRENGTH CONCRETE COMPOSITION OBTAINED BY THE SAME PRODUCTION

摘要

PURPOSE: To obtain a high-strength concrete composition having high fluidity and material separation preventing properties by simple operation by blending a specific plain concrete with a water-soluble vinyl copolymer and a graft copolymer. CONSTITUTION: This high-strength concrete composition is obtained by blending a plain concrete comprising 300-650kg/m<3> unit amount of a binding material, 700-1,200kg/m<3> unit amount of a fine aggregate and 150-185kg/m<3> unit amount of water with a cement chemical admixture composed of (a) a water-soluble vinyl copolymer constituted of a unit shown by formula I and formula II and having 1.500-50,000 number-average molecular weight and (b) a graft copolymer constituted of a unit shown by formula III and formula IV in the component weight ratio of (a)/(b)=98/2-70/30 and in the ratio of the 0.1-3.5 pts.wt. of the cement chemical admixture to 100 pts.wt. of the binding material. In the formulas, R<1> and R<2> are each H or CH3 ; R<3> is a 1-3C alkyl; M1 and M2 are an alkaline (earth) metal, etc.; R<5> and R<6> are each H or CH3 ; R<7> is a 1-3C alkyl; M<3> is an alkaline (earth) metal, etc.