READY-MADE CONCRETE ADMIXTURE COMPRISING LIME STONE FINE POWDER, GRINDING AID AND STRENGTH ENHANCER

摘要

PURPOSE: Provided is ready-mixed concrete admixture which is improved in flowability, the resistance against the separation of materials, the inhibition of bleeding and the reduction of hydration caloric value and is reduced in manufacturing cost. CONSTITUTION: The ready-mixed concrete admixture comprises a lime stone fine powder which has a chemical composition comprising 92.5 wt% or more of CaCO3, 5 wt% or less of MgO, 0.5 wt% or less of SO3, 1.0 wt% or less of Al2O3 and 1.0 wt% or less of wet powder, and has a Blaine specific surface area of 2,000-6,000 cm2/g. Preferably the ready-mixed concrete admixture comprises 100 parts by weight of a lime stone fine powder; 0.01-0.20 parts by weight of a grinding aid; and/or 0.05-1.0 parts by weight of a strength enhancer.