Open AccessEFFECT OF CALCIUM SULFOALUMINATE ADDITIVE ON LINEAR DEFORMATION AT DIFFERENT HUMIDITY AND STRENGTH OF CEMENT MORTARS
Author(s) -
Kadhim Abdulwahid Al-Musawi,
Kottayil Bindhu Abraham,
Tatsiana Potses,
С. Н. Леонович,
Natallia Kalinouskaya,
M Belrauh,
Н. А. Будревич
Publication year - 2020
Publication title -
inżynieria bezpieczeństwa obiektów antropogenicznych
Language(s) - English
Resource type - Journals
eISSN - 2450-8721
pISSN - 2450-1859
DOI - 10.37105/iboa.64
Subject(s) - relative humidity , humidity , mortar , materials science , composite material , compressive strength , shrinkage , cement , hardening (computing) , flexural strength , deformation (meteorology) , meteorology , physics , layer (electronics)
The effect of calcium sulfoaluminate additives (CSA) on the compression and bending strength of mortar, as well as linear deformation of prism samples at different environmental humidity was studied. Test results indicate that bending strength of mortars with CSA and the referent at the age of 28 days are practically equal. Compressive strength of mortars with CSA reduced by 20 ... 23% for all dosages of CSA. Relative linear deformations depend on the humidity of the environment. At a humidity of 100%, the relative linear deformations are positive and the expansion increases with increasing dosage of the expanding additive. When hardening in dry air at a humidity of 55%, the greatest shrinkage deformations were for mortars with CSA. We can conclude that the expanding effect of CSA is fully manifested at high humidity, i.e. under construction conditions, this means very high-quality moisture care for concrete structures.