A multi-functional admixture for simultaneously providing specified
characteristics to hydraulic cement compositions such as concrete
contains one or more of specified reaction mixtures obtained by specified
two processes as well as partially or completely neutralized substances
obtained from such a reaction mixture through a specified third process.
The specified two processes include initiating a radical copolymerization
process of a radical polymerizable monomer mixture containing maleic
anhydride and a monomer of a specified kind in a non-aqueous system in
the presence of a non-aqueous radical initiator and stopping the radical
copolymerization reaction in its midst while the inversion rate of
polymerization is at a specified level by adding water to the reaction
system to thereby obtain a reaction mixture. The specified third process
is for partially or completely neutralizing the reaction mixture.