Concrete admixture, concrete composition, concrete composition driving method, and mass concrete

摘要

PROBLEM TO BE SOLVED: To mix concrete which can reduce a structure strength correction value even when it receives a high temperature history due to ambient environmental conditions, heat of hydration, etc., especially in the early stage of hardening of hot concrete, mass concrete, etc. The issue is the provision of agents. A concrete admixture contains at least one A component selected from a water-soluble vinyl copolymer and a B component composed of an aldehyde condensate having an aromatic ring, and the mass of the A component / B component. The ratio is in the range of 30/1 to 1/20. The mass ratio of component A / component B is preferably in the range of 18/1 to 1/10, and component B is naphthalene sulfonic acid and / or a condensate of naphthalene sulfonate and formaldehyde, and / or , Melamine sulfonic acid and / or a condensate of melamine sulfonate and formaldehyde. [Selection diagram] None