Influence of Surfactants on Humid Shrinkage of Concretes

The humid shrinkage is the most important and problematic property of contemporary concretes of modified structure reducing their quality. The article shows that the main component of the modifier of concrete structure – an additive-super-plasticizer stimulates the increase of shrinkage phenomena. Features of the structure and composition of additive-plasticizers used at present are revealed. Four trademarks of additive-super-plasticizers with different compositions and structures of macro-molecules are studied. The influence of selected additive- plasticizers on the processes of early structure formation of cement systems (beginning from the moment of components mixing), on the balance of internal (film splintering and capillary retracting) forces in the system in a wide range of water-cement ratios is studied. Further the influence of these additives on the shrinkage indicators is researched. The results obtained already provide the necessary guidelines for specialists and consumers of these additives.

E.I. SHMIT’KO, Doctor of Sciences (Engineering),
N.A. BEL’KOVA, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
Yu.V. MAKUSHINA, Engineer

Voronezh Technical University University (84, 20-letiya Oktyabrya Street, 394006, Voronezh, Russian Federation)

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