RT Conference Proceedings T1 Alite hydration mechanism in presence of ye’elimite related to BAY cements A1 Londono-Zuluaga, Diana A1 Tobón, Jorge Iván A1 García-Aranda, Miguel Ángel A1 Santacruz-Cruz, María Isabel A1 Gómez-de-la-Torre, María de los Ángeles K1 Cemento AB One alternative to decrease CO2 emissions from ordinary Portland Cement (OPC) production consistson the development of a new kind of eco-cements composed by less calcite demanding phases. That isthe case of Belite-Ye’elimite-Ferrite (BYF) cements, which have β-belite as a main phase and ye’elimiteas a secondary phase. But the low reactivity of β-belite is well known, consequently these materialsdevelop low mechanical strengths at early/intermediate hydration ages. A possible solution proposed tosolve this problem consists on the production of cements which contain belite, alite and ye'elimitetogether, known as Belite-Alite-Ye’elimite (BAY) cements. Consequently, the reaction of alite andye'elimite with water would develop cements with higher mechanical strengths at early ages, while β-belite will contribute to later ages.The main objective of this work is to better understand the hydration behavior of monoclinic alite inpresence of ye’elimite (both stoichiometric and pseudo-cubic polymorphs), in order to be compared witha BAY eco-cement systems. The hydration of systems with selected alite/ye’elimite ratios were studiedfor the first 24 hours. The main techniques used for this study were in-situ synchrotron X-ray powderdiffraction combined with Rietveld methodology and isothermal calorimetry. YR 2019 FD 2019-10-08 LK https://hdl.handle.net/10630/18540 UL https://hdl.handle.net/10630/18540 LA eng NO Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.BIA17-82391-RBeca Colciencias 646—Doctorado en el exterior and Enlaza Mundos 2013 (Colombia) DS RIUMA. Repositorio Institucional de la Universidad de Málaga RD 21 ene 2026