Abstract
Cement is one of the main sources of environmental impacts of concrete use. It is thus recognized that the most pragmatic solution for minimizing environmental impacts of concrete is the reduction of the cement content. This could be achieved by replacing a part of cement with mineral additions such as fly ash, blast-furnace slag or metakaolin (MK) during concrete mixing.In recent years, the incorporation of MK in building materials is growing. Metakaolin (Al2Si2O2) is a material obtained by calcination of kaolinite between 500°C and 800°C.In this study, Three MK issued from three different regions in Algeria were tested. The regions are, Jijel, Gulema and Béchar. This study aims to investigate the effects of the origin of MK blended at early age. The chemical and minalorgiques analysis (XRD, BET, SSB and SEM) show a difference in their metakaolinite content. One mortar prepared with 15% substitution rates of cement with different MK. The early-age reactivity of metakaolin-blended cement mortar was investigated. Isothermal calorimetry and compressive strength tests were performed. The hydration rate and the evolution of Ca(OH)2 content of mortars were monitored using thermogravimetric analysis (ATG). The early age reactivity of the three MKs is very different.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
