Abstract The present invention is an improved one of the U.S. Pat. Application Ser. No. 211,307 now U.S. Pat. No. 3,782,992 and relates to a process for regulating setting time of hydraulic cement which comprises clinker containing 5 - 60 % by weight of 11CaO.7Al2O3.CaX2, more than 5 % by weight of 3CaO. SiO2, and further 2CaO.SiO2 solid solution and 4CaO.Al2O3.Fe2O3; anhydrite with or without hemihydrate; at least one selected from the group consisting of sugars, sodium hydrogen carbonate, water-soluble phosphates, carboxylic acids, silicofluorides, sodium silicates, ligninsulfonate, sulfuric esters of higher alcohol and alkylsulfonates, whereby the anhydrite is contained in an amount that Al2O3/SO3 weight ratio of Al2O3 in the clinker and SO3 in the anhydrite is 0.7 - 1.8 and hemihydrate is contained less than 5 % by weight based on SO3.
The process of claim 1, wherein the cement further contains hemihydrate.
Claim 2
Dependent Claim
20 words
The process of claim 2, wherein said hemihydrate is present in said cement in amounts less than 5% by weight.
Claim 3
Dependent Claim
23 words
The process of claim 1, wherein said cement contains 0.1-5.0% by weight of a silicofluoride based on the fluorine content of said silicofluoride.
Claim 4
Dependent Claim
65 words
A hydraulic cement composition consisting essentially of a clinker containing 5-60% by weight of 11CaO.7Al2O3.CaX2, wherein X represents a halogen atom, and more than 5% by weight of 3CaO.SiO2 solid solution, 2CaO.SiO2 solid solution and 4CaO.Al2O3.Fe2O3; anhydrite; and a silicofluoride, wherein the anhydrite is present in an amount such that the weight ratio of Al2O3 in the clinker to SO3 in the anhydrite is 0.7-1.8.
Claim 5
Dependent Claim
14 words
The hydraulic cement composition of claim 5, wherein the cement composition further contains hemihydrate.
Claim 6
Dependent Claim
18 words
The hydraulic cement composition of claim 6, wherein the cement composition contains less than 5% by weight hemihydrate.