RT Journal Article
T1 The effects of MgO, Na2O and SO3 on industrial clinkering process: phase composition, polymorphism, microstructure and hydration, using a multidisciplinary approach
A1 Segata, Monica
A1 Marinoni, Nicoletta
A1 Galimberti, Matteo
A1 Marchi, Maurizio
A1 Cantaluppi, Marco
A1 Pavese, Alessandro
A1 Gómez-de-la-Torre, María de los  Ángeles
AB The present investigation deals with how minor elements (their oxides: MgO, Na2O and SO3) in industrial kilnfeeds affect (i) chemical reactions upon clinkering, (ii) resulting phase composition and microstructure ofclinker, (iii) hydration process during cement production.Our results show that all these points are remarkably sensitive to the combination and interference effectsbetween the minor chemical species mentioned above.Upon clinkering, all the industrial raw meals here used exhibit the same formation temperature and amountof liquid phase. Minor elements are preferentially hosted by secondary phases, such as periclase. Conversely, thegrowth rate of the main clinker phases (alite and belite) is significantly affected by the nature and combinationof minor oxides. MgO and Na2O give a very fast C3S formation rate at T > 1450 K, whereas Na2O and SO3 boostC2SAfter heating, if SO3 occurs in combination with MgO and/or Na2O, it does not inihibit the C3S crystallisationas expected. Rather, it promotes the stabilisation of M1-C3S, thus indirectly influencing the aluminate content,too. MgO increseases the C3S amount and promotes the stabilisation of M3-C3S, when it is in combination withNa2O. Na2O seems to be mainly hosted by calcium aluminate structure, but it does not induce the stabilisation ofthe orhtorhombic polymorph, as supposed to occur. Such features play a key role in predicting the physicalmechanicalperformance of a final cement (i.e. rate of hydration and hardening) when used as a bulding material.
YR 2019
FD 2019-07-02
LK https://hdl.handle.net/10630/18021
UL https://hdl.handle.net/10630/18021
LA spa
NO Preprint publicado en: Materials Characterization Volume 155, September 2019, 109809
NO The present study has been partly funded by the project PRIN 2017(2017L83S77), of the Italian Ministry for Education, University andResearch (MIUR).
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 21 ene 2026