Hydration in the system-cement-limestone-fly ash represents a complex area of numerous reactions and their interactions. The investigations dealt with binary systems: cement-limestone, cement-fly ash and limestone-fly ash. Hydrated phases and their morphologies were determined. The hydration of cement-limestone-fly ash is only weakly dependent on time and temperature (28/90 days and 25/40 °C). All products contain ettringite, CSH, portlandite and calcite, but they are not clearly visible on SEM. All these hydrated phases are of much smaller dimensions than in standard hydrated cements.
F.14 Improvements to existing production methods and tools or processes
COBISS.SI-ID: 4136730Portland cement with 10 and 20% of calcite of different particle sizes (from 0.8 to 40 mm) was hydrated from 3 to 90 days at 25 °C. Phase composition of hydrated products was evaluated by TG/DTG and XRD. The formation of monocarboaluminate was followed and the relation between calcite characteristic dimension and the appearance of high-temperature DTG effect of monocarboaluminate decarboxylation was established. Monocarboaluminate content increases with hydration time and the content of 7% after 90 days of hydration represents an important crystalline phase in a hardened cement paste.
F.14 Improvements to existing production methods and tools or processes
COBISS.SI-ID: 3730970An important invited lecture on the topic of the characterization of micro- and mesoporous materials was delivered by prof. Kaučič at the 4th International FEZA Conference in Paris, France in 2008. Program group members presented their research results in more that 10 invited lectures. Such lectures are important for their scientific value and for the presentation and promotion of Slovenian science and research groups to the international science community.
B.04 Guest lecture
COBISS.SI-ID: 3992602