Investigation of the Bonding Performance and Microstructure of MOC Binders for SiO2 as Rock-like Composites

• DOI: 10.3390/ma17164083
• Publication Date: 2024-08-19T10:41:31Z
• Authors: Jie Jing; Hongbo Li; Xin Zheng; Kai Zhao

The heterogeneity of natural rocks complicates the study carbon sequestration within these materials and raises concerns about reproducibility experimental results. Consequently, identifying appropriate rock-like has become critical. This research examined impact various factors-humidity, binder content, curing period, cold pressure-on bond strength magnesium oxychloride cement (MOC) through orthogonal testing. tests utilized a molar ratio MgO to MgCl2-6H2O H2O 7:1:18. Both X-ray diffraction (XRD) scanning electron microscopy (SEM) were employed analyze hydration reactions MOC explore correlation between microstructure SiO2-MgO-MgCl2 system its bonding characteristics. findings indicated that 5% relative humidity enhances 7-day MOC. Moreover, increasing 60% supports ongoing strength-contributing phases. A content ranging from 15% 25% proved optimal, yielding samples with superior stiffness. While pressing initially properties MOC, solution loss during process adversely affects long-term From mechanical standpoint, silica-magnesium oxide-magnesium chloride demonstrates exceptional early resilience, positioning it as promising material system.