The impact of modified cement with a special additive on construction mortar deformations

The study is devoted to the modification of 42.5 class ordinary Portland cement with a 10% special expanding additive (cement powder and gypsum in 40:60 percentage ratio), impact this on mortar determined. Using modified multi-fraction quartz sand ratio 1:3, prism-shaped samples size 4x4x16 cm were fabricated, left water bath for 24±2 hours after formation. After one day curing, demolded, their linear dimensional change was verified using an indicator, they then submerged water. three, seven, 28 days samples’ changes dimensions examined again indicator. It has been revealed that introducing specially developed expansion composition also contributes maximum construction at 3–7 hardening. 28-day curing time very little different from 7-day Considering data test samples, we can conclude synthesized allows production non-shrinkable, expansive mortars concretes, which are currently being studied.