This study has examined the effect of a zeolite-based additive on cement hydration processes. This additive and samples of hardened cement pastes have been examined using X-ray diffraction, thermoanalytical methods (TG and DSC) and FTIR spectroscopy analysis. The results show that a modified zeolite additive increases the compressive strength of hardened cement paste specimens. The increase in compressive strength may be related to active SiO₂ and Al₂O₃ present in the modified zeolite. The highest density was recorded in specimens containing 10% of the modified zeolite additive. Instrumental analysis has revealed that with the increase of this zeolite additive content the content of portlandite – Ca(OH)₂ – in the mineral composition of hardened cement paste reduces from 11.9 to 5.3% after 3 days of setting and from 15.0 to 7.6% after 28 days of setting. The highest amounts of C-S-H gel are observed when the modified zeolite additive is used.

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