Effect of gypsum content in sprayed cementitious matrices: Early age hydration and mechanical properties
journal contributionposted on 29.01.2019, 13:23 by C. Herrera-Mesen, Renan P. Salvador, Sergio Pialarissi-CavalaroSergio Pialarissi-Cavalaro, Antonio Aguado
© 2018 Elsevier Ltd Sprayed materials must present short setting times and a fast early strength development for safety and productivity reasons. In order to improve these characteristics, the construction industry has focused on the development of new formulations of accelerators. Research and improvement of other components of the mix, such as cement or additions, have not advanced at the same rate despite being also crucial for the reaction kinetics. The objective of this work is to evaluate the influence of gypsum content on the hydration and mechanical strength development in sprayed mixes. Sprayed pastes and mortars were prepared with one type of cement, two types of accelerators and different gypsum contents. Kinetics, mechanisms of hydration and mechanical properties were evaluated. Results showed a better performance in sprayed mixes that contain ideal doses of gypsum. Such approach provides valuable information for the improvement of the formulation of cement used in sprayed concrete applications.
This research was possible due to the project RTC-2015-3185-4 (MAPMIT), co-funded by the Ministerio de Economía y Competitividad of Spain in the Call Retos Colaboración 2015 and by the European Union through FEDER funds under the objective of promoting the technological development, innovation and high quality research.
- Architecture, Building and Civil Engineering