Abstract
Magnesium phosphate cements are normally referred as chemically bonded ceramic materials and have a vast range of potential applications, due to their excellent performance. This study aims to investigate the effects of carbonation curing on hydration and microstructure of magnesium potassium phosphate (MKPC) concrete. Concrete specimens were prepared and cured in ambient as well as carbonation curing environment. The performance of MKPC concrete specimens were examined via compressive strength and nano indentation tests. In addition, microstructure, and hydration products of MKPC specimens on carbonation curing were investigated via Backscatter electron microscopy (BSEM), Energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and Thermogravimetric analysis (TGA). Experimental results show that the MKPC concrete with carbonation curing represents increased mechanical properties compared to uncarbonated MKPC concrete specimens. The results also showed that the production of magnesium carbonate like Nesquehonite under carbonation had a filling effect that refined the microstructure and enhanced the mechanical properties of the composites.
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