An additive composition for modifying a hydratable cementitious composition, comprising: (A) at least one cement dispersant for dispersing hydratable cementitious particles within an aqueous environment; (B) a ketone alcohol oil waste ("KAOW") byproduct obtainable from a commercial production process whereby cyclohexanol and cyclohexanone are produced from cyclohexane, the commercial process comprising the following stages (i) through (iii) as follows: (i) oxidation stage wherein cyclohexane is oxidized to provide a stream of cyclohexanol, cyclohexanone, and other byproducts, (ii) decanting stage wherein the stream of cyclohexanol, cyclohexanone, and byproducts produced by the oxidation stage is subjected to caustic treatment to remove alkali-soluble waste material thereby obtaining KAOW from the post-oxidation stream, and (iii) distillation stage wherein the cyclohexanol/cyclohexanone/byproduct stream treated in decanting stage (ii) is provided into at least one separation column for recovering any residual cyclohexane or for removing high-boiling point material from the cyclohexanol/cyclohexanone/ byproduct stream; wherein the KAOW byproduct removed from the decanting stage (ii) comprises at least four of sodium hydroxide, sodium carbonate, sodium bicarbonate, sodium formate, sodium butyrate, sodium caproate, sodium glutarate, sodium adipate, sodium valerate, and sodium malonate; and wherein the above components (A) and (B) are provided in the weight ratio (A:B) of 25-75:75-25. (A) at least one cement dispersant for dispersing hydratable cementitious particles within an aqueous environment; (B) a ketone alcohol oil waste ("KAOW") byproduct obtainable from a commercial production process whereby cyclohexanol and cyclohexanone are produced from cyclohexane, the commercial process comprising the following stages (i) through (iii) as follows: (i) oxidation stage wherein cyclohexane is oxidized to provide a stream of cyclohexanol, cyclohexanone, and other byproducts, (ii) decanting stage wherein the stream of cyclohexanol, cyclohexanone, and byproducts produced by the oxidation stage is subjected to caustic treatment to remove alkali-soluble waste material thereby obtaining KAOW from the post-oxidation stream, and (iii) distillation stage wherein the cyclohexanol/cyclohexanone/byproduct stream treated in decanting stage (ii) is provided into at least one separation column for recovering any residual cyclohexane or for removing high-boiling point material from the cyclohexanol/cyclohexanone/ byproduct stream; (i) oxidation stage wherein cyclohexane is oxidized to provide a stream of cyclohexanol, cyclohexanone, and other byproducts, (ii) decanting stage wherein the stream of cyclohexanol, cyclohexanone, and byproducts produced by the oxidation stage is subjected to caustic treatment to remove alkali-soluble waste material thereby obtaining KAOW from the post-oxidation stream, and (iii) distillation stage wherein the cyclohexanol/cyclohexanone/byproduct stream treated in decanting stage (ii) is provided into at least one separation column for recovering any residual cyclohexane or for removing high-boiling point material from the cyclohexanol/cyclohexanone/ byproduct stream; wherein the KAOW byproduct removed from the decanting stage (ii) comprises at least four of sodium hydroxide, sodium carbonate, sodium bicarbonate, sodium formate, sodium butyrate, sodium caproate, sodium glutarate, sodium adipate, sodium valerate, and sodium malonate; and wherein the above components (A) and (B) are provided in the weight ratio (A:B) of 25-75:75-25. <EOS>