Brittleness Determination for Cement Blends with Siliceous Additives

The paper presents research of brittleness cement blends with siliceous additives using impact strength. The advantages of the developed method are simplicity of definition, low cost of equipment and operation. In the presented research were studied additives on the basis of finely ground glass obtained from waste glass containers and pozzolanic additives as fly ash, silica fume and synthetic silica. Increase in additives amount in respect to the cement mass reduces brittleness by ~10 % after 28 days of curing. The addition of 35 % of ground glass decreases the brittleness of the cement paste, whereas 10 % of pozzolanic additive increase it during the period from 1 to 28 days. Determination of brittleness using impact strength can be used to evaluate the activity of siliceous additives in cement blends.