The admixtures for a cementitious composition of the invention, which have the
above-mentioned constitutions, can suitably be used in cement pastes, mortar, concrete
and like cement compositions and can stabilize the amount of air entrained with
the lapse of time and thus facilitate the quality control of cement compositions
and, further, can improve the workability of cement compositions owing to their
excellent dispersing capacities. The cement compositions of the invention which
comprise such admixture for a cementitious composition are excellent in water-reducing
ability and workability and can give hardened products excellent in strength and
durability and, further, can stably maintain the amount of air entrained without
allowing increases in the amount of air even when the time of kneading is prolonged
in the production.
