Comparative analysis of freeze-thaw resistance assessment of modified building mortars according on various criteria
Abstract
Comparative analysis of freeze-thaw resistance assessment of modified building mortars according on various criteria
Incoming article date: 13.12.2024The article deals with thea comparative analysis of frost resistance assessment results obtained from dry building mixes containing redispersible polymer powders and finely dispersed fillers of natural and technogenic origin, building mortars according to such freeze-thaw resistance criteria as change in ultrasound velocity and dynamic modulus of elasticity, compressive and flexural strength, and adhesion strength to concrete base. The composition of the mixtures is represented by the component ratio C:P:MD = 1:1.3:0.2 at W/C = 0.4. The number of freeze-thaw cycles implemented for the studied compositions, depending on the dosage of redispersible polymer powders, ranged from 100 to 125. Ffreeze-thaw resistance of the studied solutions is not exhausted according to the main standardized criteria. A positive effect of RPP on the freeze-thaw resistance of the contact zone is noted. The most “rigorous” criterion is the flexural strength.
Keywords: dry construction mixture, freeze-thaw resistance, strength, mortar, chemical water treatment sludge, redispersible powders