On-line version ISSN 1980-5373
ALMEIDA, Alessandra Etuko Feuzicana de Souza and SICHIERI, Eduvaldo Paulo. Thermogravimetric analyses and mineralogical study of polymer modified mortar with silica fume. Mat. Res. [online]. 2006, vol.9, n.3, pp. 321-326. ISSN 1980-5373. http://dx.doi.org/10.1590/S1516-14392006000300012.
Mineral and organic additions are often used in mortars to improve their properties. Microstructural investigation concerning the effects of styrene acrylic polymer and silica fume on the mineralogical composition of high-early-strength portland cement pastes after 28 days of hydration are presented in this paper. Thermogravimetry and derivative thermogravimetry were used to study the interaction between polymers and cement, as well as the extent of pozzolanic reaction of the mortars with silica fume. Differential scanning calorimetry and X ray diffraction were used to investigate the cement hydration and the effect of the additions. The results showed that the addition of silica fume and polymer reduces the portlandite formation due to delaying of Portland cement hydration and pozzolanic reaction.
Keywords : silica fume; polymer; thermal analysis; X ray diffraction.