Scientific and technical studies on eco-efficient binary cements produced with thermally activated ichu grass: Behaviour and properties

• Autores: Frias, Moises, Caneda-Martinez, Laura, Sanchez de Rojas, M. Isabel, Tenazoa, Carlos, Flores, Elena
• Formato: artículo
• Fecha de Publicación: 2020
• Institución: Consejo Nacional de Ciencia Tecnología e Innovación
• Repositorio: CONCYTEC-Institucional
• Lenguaje: inglés
• OAI Identifier: oai:repositorio.concytec.gob.pe:20.500.12390/2824
• Enlace del recurso: https://hdl.handle.net/20.500.12390/2824; https://doi.org/10.1016/j.cemconcomp.2020.103613
• Nivel de acceso: acceso abierto
• Materia: General Materials Science; Building and Construction; http://purl.org/pe-repo/ocde/ford#2.05.01

The present research study analyses, for the first time, the viability of using thermally activated ichu grass as a supplementary cementitious material for the design of future eco-cements. To this end, the ichu ash resulting from the activation was characterised and its pozzolanic activity, the evolution of its mineralogical phases during the pozzolanic reaction and the physical-mechanical behaviour of the blended cementitious matrices were analysed. The results show that ichu ash exhibited high pozzolanic activity in a pure pozzolan/lime system as a consequence of its high reactive silica content. Conversely, its use in a pozzolan/cement system gave rise to negative effects due to the presence of important alkali contents in the ash (9.6% Na2O eq). The blended cements presented greater water demand, reduced capillary absorption, increased resistivity and lower mechanical properties (10-14%) as well as reduced average pore size than the reference mortar. These blended cement matrices comply with the physical-mechanical requirements established in the standards for the production of eco-cements.