ADDITIVE OF PROTEIN NATURE FOR HYDRAULIC CEMENTS, MORTARS AND CONCRETES, AND USE THEREOF IN THE FIELD OF CONSTRUCTION

摘要

Additive of protein nature for hydraulic cements, mortars andconcretes, and use thereof in the field of constructionABSTRACT OF THE DISCLOSUREThe present invention relates to a novel additive for hydrauliccements, mortars and concretes, particularly for improving the mechanicalstrengths and the workability and for reducing sweating and segregation,which is characterized in that it is a protein hydrolysate having a pHless than or equal to 6, comprising substances selected from the groupconstituted by proteins, polypeptides, aminoacids and mixtures thereof,and obtained by treating 100 volumes of an aqueous composition contai-ning at least one protein substance selected from the group constitutedby proteins, polypeptides and mixtures thereof, with at least one bacterialstrain producing lactic acid having a population greater than or equalto 102 germs/cm3, in the presence of 0.5 to 30 parts by weight of asource of carbon belonging to the family of carbohydrates, for at least2 hours, at a temperature of between 0 and 65°C and at a pH less thanor equal to 6.