Abstract
Summary Among the major challenges in Carbon Capture and Storage (CCS) is maintaining the integrity of injection wellbores, as the degradation of Ordinary Portland Cement (OPC) in the presence of rich CO2-brine systems may result in leakage. Geopolymers (GPs) are promising alternatives for OPC that can be synthesized through the alkali activation of low Ca-content aluminosilicate precursors. Research has shown the notable impact of system chemistry (Si/Al, Si/(Na+K), Si/Ca, etc.) on the setting time, rheology, permeability, and mechanical durability of GP systems. However, merely a limited number of studies has investigated the role of Mg-content in determining the properties of GPs. This research aims to fill the gap through analyzing the impact of various Mg-bearing additives (Mg(NO3)2, MgSO4, and MgO) on a granite-based GP system, taking into account the consistency of the fresh mix, and uniaxial compressive strength (UCS) development. In addition, the morphology of the materials was examined through scanning electronic microscopy (SEM). Results showed that MgO caused acceleration of GP setting, while Mg(NO3)2 acted as a retarder and MgSO4 did not affect the setting behavior of the GP system. In addition, only Mg(NO3)2 had a non-negligible impact on mechanical strength, causing a 22.51 % reduction in UCS.
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.
