Low porosity cement and process for producing same

Details Low porosity cement and process for producing same Low porosity cement and process for producing same

C - Chemistry, Metallurgy

04

B

261/49, 261/57

C04B 7/02 (2006.01) C04B 28/02 (2006.01)

Patent

CA 1061809

LOW POROSITY CEMENT AND PROCESS F O R PRODUCING SAME Abstract of the Disclosure A method is disclosed for making low-porosity, free-flowing cement pastes with extended set times, improved workability and reduced expansion due to alkali aggregate reactions by combining hydraulic cements, especially portland- type cements, ground without gypsum with from 0.1% to about 1.0% of an alkali or alkaline earth lignosulfonate or sulfonated lignin, and 0.1% to 2.0% of an alkali bicarbonate, and combining with 20% to 40% water. Mixtures of aggregates with such low-porosity pastes made according to this process produce very workable mortars and concretes with extended set times and upon hardening have reduced expansion.

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