Abstract
The article presents a comparison of pozzolanic activity of R-Mud, which is a by-product of TiO2, with known and long-used additives to cement and concrete. Tests were carried out comparing the amount of heat of the hydration of cement and cement with added R-Mud, silica fume, fly ash and trass. The reaction susceptibility of these additives with calcium hydroxide has also been studied using the thermogravimetric method. Results from this method have shown that the reactivity of R-Mud is high and at a similar level to silica fume, while it is much higher than the reactivity of fly ash or natural trass. The high level of pozzolanic reactivity of R-Mud has been confirmed by both isothermal calorimetry and thermogravimetry.
Highlights
Contemporary environmental concerns generate the need for such management of industrial waste that does not pose a potential threat and does not end up in landfill
From the comparison of the total amount of heat released in the hydration process (Fig. 1) of cement mixtures CEM I 42.5R with individual pozzolanic additives, the smallest amount of heat released after 140 h was observed in silica fume
CEM I 42,5 R CEM I 42,5 R + 15% SF CEM I 42,5R + 15%- R Mud CEM I 42,5 R + 15% Trass CEM I 42,5 R + 15% FA. This effect at the beginning of the hydration process, for this additive the result will be comparable in the initial period to the additive with silica fume and slightly more intense than for the additive containing trass or fly ash
Summary
Contemporary environmental concerns generate the need for such management of industrial waste that does not pose a potential threat and does not end up in landfill. The justification for this approach is that due to changes occurring in the processes of hydration of cement binders from waste components, it is often possible to obtain beneficial effects related to the formation of a microstructure similar to hydrated cement. The problem of usage of industrial waste still arouses interest, and further research is needed in this area. There are many examples of the use of waste for industrial purposes, but in this text we will limit ourselves to
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