Influence of carbonation curing on hydration and microstructure of magnesium potassium phosphate cement concrete. (June 2021)

• Record Type: Journal Article
• Authors: Jeon, In Kyu; Qudoos, Abdul; Kim, Hong Gi
• Is Part Of: Journal of building engineering. Volume 38(2021)
• Publication Date: 2021-06
• Subjects: Magnesium potassium phosphate cement concrete -- Carbonation curing -- Nanomechanical properties -- Microstructure; Building -- Periodicals; 690.05
• DOI: 10.1016/j.jobe.2021.102203
• Languages: English
• ISSNs: 2352-7102

Abstract

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. Highlights: Magnesium potassium phosphate cement concrete using dead-burned magnesia is made. Specimens are cured under carbonation and ambient curing conditions. Mechanical and microstructural properties are investigated. Carbonation curing enhanced the performance of composites.