A method of servicing a wellbore comprising placing in the wellbore a composition comprising a non-API compliant reactive calcium silicate based hydraulic binder and at least one gelation inhibiting retarder, and allowing the composition to set. A method of servicing a wellbore comprising placing in a wellbore a cement composition comprising an industrial waste product selected from the group consisting of Class C Fly ash, cement kiln dust, and combinations thereof and a gelation inhibitor, and allowing the composition to set. A method of controlling the thickening time of a cementitious composition comprising contacting a material having greater than 15 wt. % of tricalcium aluminate and tetracalcium aluminoferrite with a gelation inhibitor comprising a alkylbenzene sulfonic acid, at least one methallyl sulfonic acid monomer; at least one copolymerizable nonionic monomer, and at least one copolymerizable olefinically unsaturated carboxylic acid monomer.