Fluidity control of cementitious compositions

Details Fluidity control of cementitious compositions Fluidity control of cementitious compositions

C - Chemistry, Metallurgy

04

B

C04B 24/24 (2006.01) C04B 24/32 (2006.01) C04B 40/00 (2006.01) C08L 23/00 (2006.01) C08L 29/10 (2006.01) C08L 33/02 (2006.01) C08L 33/14 (2006.01) C08L 71/02 (2006.01)

Patent

CA 2125521

42 ABSTRACT An admixture for modifying the fluidity of a cementitious mixture comprises a cement-dispersing agent which is an aqueous solution of polymer, in which solution an oxyalkylene-based defoaming agent is dissolved or dispersed in particles of no greater that 20µM diameter. The polymer is preferably a polymer which comprises units derived from unsaturated carboxylic acid monomer and the polymer is preferably prepared in the presence of the defoaming agent. Particular addition copolymers give particularly good results. The admixture permits good control of the fluidity of cementitious compositions and has extended shelf life.

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