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Physico-mechanical and microstructural characteristics of thermally treated cement pastes containing limestone
The effect of thermal treatment on the physico-mechanical and microstructural characteristics of the hardened Portland cement pastes containing limestone was studied. Five cement-limestone blends were prepared using 0,5, 10, 15 and 20% of limestone as a partial substituent of Portland cement. The cement pastes were prepared using the standard water of consistency of 0.225, 0.258, 0.261 and 0.263, respectively. The fresh pastes, thus produced, were moulded into 2x2x2 cm cubes. The pastes were first cured within the moulds at 100% relative humidity for 24 hours; then the specimens were demoulded and cured under tap water for 28 days. The specimens were subjected to thermal treatment at 200, 400 and 600 deg C for a fixed time hours, and then the thermally treated specimens were cooled slowly. The thermally treated pastes were tested for their bulk density, compressive strength, differential scanning calorimetry (DSC), X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). The results of microstructure of the formed hydrates were related as much as possible to the mechanical properties of the hardened cement pastes. The inclusion of limestone results in a notable change of the morphology and microstructure of the formed hydrates and its effect on the mechanical properties of the cement pastes containing limestone.
Physico-mechanical and microstructural characteristics of thermally treated cement pastes containing limestone
The effect of thermal treatment on the physico-mechanical and microstructural characteristics of the hardened Portland cement pastes containing limestone was studied. Five cement-limestone blends were prepared using 0,5, 10, 15 and 20% of limestone as a partial substituent of Portland cement. The cement pastes were prepared using the standard water of consistency of 0.225, 0.258, 0.261 and 0.263, respectively. The fresh pastes, thus produced, were moulded into 2x2x2 cm cubes. The pastes were first cured within the moulds at 100% relative humidity for 24 hours; then the specimens were demoulded and cured under tap water for 28 days. The specimens were subjected to thermal treatment at 200, 400 and 600 deg C for a fixed time hours, and then the thermally treated specimens were cooled slowly. The thermally treated pastes were tested for their bulk density, compressive strength, differential scanning calorimetry (DSC), X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). The results of microstructure of the formed hydrates were related as much as possible to the mechanical properties of the hardened cement pastes. The inclusion of limestone results in a notable change of the morphology and microstructure of the formed hydrates and its effect on the mechanical properties of the cement pastes containing limestone.
Physico-mechanical and microstructural characteristics of thermally treated cement pastes containing limestone
Physikalisch-mechanische sowie Mikrostrukturcharakteristika von wärmebehandelten kalksteinhaltigen Zementpasten
Helal, M.A. (author)
2001
12 Seiten, 13 Bilder, 6 Quellen
Conference paper
English
| British Library Conference Proceedings | 2001
Physico-mechanical characteristics of admixed cement pastes containing melment
| Tema Archive | 2002
| British Library Online Contents | 2013