CEMENT SHRINKAGE REDUCING AGENT AND METHOD FOR OBTAINING CEMENT BASED ARTICLES HAVING REDUCED SHRINKAGE

The invention relates to a composition comprising a hydraulic binder, a low molecular weight glycol having the formula C<SUB>n</SUB>H<SUB>2n</SUB>(OH)<SUB>2 </SUB>wherein n is an integer from 2 to 10, preferably 2 to 9, and a fluorinated surfactant capable of reducing the surface tension of pure water to a value below 30 mN/m at a concentration of 1% or less. The invention also relates to a wet mortar or concrete composition comprising a hydraulic binder, a low molecular weight glycol having the formula C<SUB>n</SUB>H<SUB>2n</SUB>(OH)<SUB>2 </SUB>wherein n is an integer from 2 to 10, preferably 2 to 9, and a fluorinated surfactant capable of reducing the surface tension of pure water to a value below 30 mN/m at a dosage of 1% or less, water and sand and/or aggregates and/or fillers. The invention also relates to a method for preparing same.