Abstracts Book - IMRC 2018

• SD6-P012
CALCIUM SILICATE HYDRATES AND THE HYDRATION OF
TRICALCIUM SILICATE
America Yazmin Torres 1 , Lauro Bucio 2 , Nora Ariadna Pérez Castellanos 2 , Perla Yolanda López
Camacho 1
1 Universidad Autónoma Metropolitana, CNI-CBS, Mexico. 2 Universidad Nacional Autónoma de
México, IFUNAM, Mexico.
When reacting with water, tricalcium silicate (C3S) -also called alite-, produces a
hydrated calcium silicate gel (CSH gel or tobermorite gel), and calcium hydroxide
Ca(OH)2 -portlandite which normally occurs in the form of thin hexagonal
platelets. CSH is an extremely variable and poorly ordered phase which is
responsible for the internal framework of the paste, the adherence and
compressive strenght. Portlandite is responsible for the adherence and keeping
the pH at high values (12-13) which gives an antibacterial effect, it also has the
property to be biocompatible and stimulates the formation of hard tissue by the
release of hydroxyl ions and calcium. In this work, we report the results of the
analysis of the setting process of the tricalcium silicate (C3S) during hydration,
by X-ray diffraction by Rietveld refinement and confocal microscopy to detect
the changes that occur in pure sinthesized tricalcium silicate paste as the
hydration progresses, making a follow-up for both characterization techniques
during the first 24 hours and at 3, 7 and 28 days. The evolution of the different
phases present was further studied by differential scanning calorimetry and
thermogravimetric analysis. Combining the results of the crystalline phase
composition and thermogravimetric analysis, a procedure was established to
estimate the amount of calcium silicate hydrate (CSH) as a function of time, as
well as the proportion of portlandite. The results will help describe the
tricalcium silicate setting process and better understand its properties.
Acknowledgment:
IFUNAM, CONACYT, UAM
Keywords: Biomaterial, Tricalcium silicate, hydration reactions
Presenting authors email: cd.americatorres@hotmail.com