POWDERY ADDITIVE FOR PREMIXED REPAIR MORTAR, PREMIXED REPAIR MORTAR, AND CEMENT HARDENED BODY

摘要

PROBLEM TO BE SOLVED: To provide an additive for premixed repair mortar having high storage stability, where the mortar is prevented from drying cracks by manifestation of a drying shrinkage reduction effect, manifests sufficient strength, provides a plasterer with excellent workability, and does not interfere with durability of a concrete structure.;SOLUTION: The powdery additive for premixed repair mortar comprises the following component (A) and component (B), where a mass ratio of component (A) and component (B) is 9:1 to 80:20. Component (A) is inorganic powder obtained by adsorption of a polyoxyalkylene derivative (a2), which is a liquid at 25°C, to inorganic powder (a1) in a mass ratio as (a1):(a2) of 20:80 to 60:40, where the polyoxyalkylene derivative is selected from polyoxyalkylene derivatives represented by formula [I]: R¹O-(AO)n-R² and represented by formula [II]: HO-(AO)m-H. Component (B) is a cationic surfactant, which is a dimethyl alkyl benzyl quaternary ammonium salt.;SELECTED DRAWING: None;COPYRIGHT: (C)2018,JPO&INPIT