CONCRETE ADDITIVE FOR UNDERGROUND CONTINUOUS WALL, CONCRETE USING THE ADDITIVE AND FORMATION OF UNDERGROUND CONTINUOUS WALL WITH THE CONCRETE

摘要

PURPOSE: To keep the flowability for a long time and to prevent separation of materials by incorporating a specified water-soluble copolymer. ;CONSTITUTION: From 95 to 5mol% of a compd. shown by formula I (R¹, R² and R³ are H or lower alkyls) and 5-95mol% of a compd. shown by formula II (R⁴ is H or lower alkyls, R⁵ is 1-4C straight-chain or branched-chain alkylenes, X is H, alkali (alkaline earth) metal groups, NH₄ or org. basic cations) are copolymerized to obtain a water-soluble copolymer having 1-15dl/g intrinsic viscosity (IN-NaCl soln. at 30°C). The copolymer by 1-100wt.% and 99-0 wt.% of a high-performance water reducing agent are mixed to obtain a concrete additive for the underground continuous wall. In this case, 0.1-0.3wt.% of the additive based on the solid component is added to 160-200kg/m² unit water amt. to obtain a concrete having 50-70cm slump flow value.;COPYRIGHT: (C)1993,JPO&Japio