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Ceskoslovenska Akademie Ved

Zdenek Zadak

Karel Kolar

Frantisek Skvara

Jaroslay Novotry

Josef Zezulka

Zdenek Friml

Vladimir Satava

Vladimir Weiss

Jaroslav Novotny

Zdenka Bazantova

The invention relates to an hydraulic binding agent with a controlled setting time, which attains high strength from the beginning of setting. The hydraulic binding agent is prepared from (a) 85 to 99.89% cement clinker, with the specific surface area of 150 to 3000 m.sup.2 /kg and with 5 to 95 weight % of particles smaller than 5 .mu.m, (b) 0.01 to 10 weight % salt of sulfomethylated condensation product of phenols with formaldehyde wherein up to 70% of the acidic groups are coupled by a trivalent cation from the metal group consisting of iron, aluminum and chromium, (c) 0.1 to 10 weight % alkaline hydroxide, carbonate, hydrogencarbonate, silicate, hydrogensilicate, hydrogensulfite or oxalate, and (d) at least 20 weight % of formation water. The condensation product may be partly oxidized. The hydraulic binding agent is suitable for numerous purposes in the building industry.

Rapidly binding high-strength cement binding agent and a method of its

A binding agent setting even at temperatures below +8.degree. C., or also at temperatures substantially lower, is manufactured on the basis of cement clinker of high specific surface area and contains as admixtures forming water, compounds based on lignosulfonates, and, if need be, also further admixtures for preparation of mortars and concretes, as is sand, rough compact and porous aggregates, regulating additives, wetting agents and dyes.

Binding agent based on cement clinker

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Kolin, Czechoslovakia

Zdenek Zadak