Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4995873 | Thermochimica Acta | 2017 | 11 Pages |
Abstract
The use of magnesium oxide (MgO) as the key reactive component within hydraulic binder systems has been reported in many studies. This study investigated the strength and microstructural development of MgO and MgO-SiO2 binder systems under different curing conditions. Concrete samples, whose binder component consisted of only MgO or MgO-SiO2 were subjected to ambient and carbonation curing conditions for 56Â days. The compressive strength results were supported with microstructural analysis performed via XRD, TG/DTG and FESEM. While the formation of brucite within MgO samples led to limited strength under ambient conditions, MgO-SiO2 samples demonstrated a steady strength development due to the formation of M-S-H. Incorporation of carbonation curing enhanced the mechanical performance of both systems, enabling rapid strength development that reached up to 77Â MPa at 7Â days. This increase in strength was associated with the densification of microstructure via the formation of Mg-carbonates, which were assessed via thermal analysis.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
C. Sonat, C. Unluer,