Effects of sodium citrate and citric acid on the properties of magnesium oxysulfate cement

• Published in: Construction & building materials Vol. 169; pp. 697 - 704
• Main Authors: Wang, Nan, Yu, Hongfa, Bi, Wanli, Tan, Yongshan, Zhang, Na, Wu, Chengyou, Ma, Haiyan, Hua, Shi
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 30.04.2018; Elsevier B.V
• Subjects: Cements (Building materials); Citric acid; Magnesium oxysulfate cement; Mechanical properties; Mechanical strength; Microstructure; Scanning microscopy; Sodium citrate; Water resistance; China; Microstructure; Mechanical strength; Water resistance; Sodium citrate; Magnesium oxysulfate cement; Citric acid
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2018.02.208

•The effects of sodium citrate and citric acid on the properties of MOS cement were studied.•More 5 Mg(OH)2·MgSO4·7H2O were generated when sodium citrate or citric acid was added into MOS cement.•Sodium citrate and citric acid could reduce the total porosity of MOS cement.•Sodium citrate and citric acid could increase the mechanical strength and water resistance of MOS cement. Magnesium oxysulfate (MOS) cement is a type of green inorganic cementitious material, with the advantages of light weight, low thermal conductivity, binding ability in light-weight panels, high temperature resistance and good fire resistance; however, its application range in practical engineering is limited by its low mechanical strength. In this paper, the influences of sodium citrate and citric acid as additives on the mechanical strength, water resistance, setting time, pH change, composition and microstructure of MOS cement were investigated. The sample properties were examined by means of mechanical strength test, Vicat apparatus, pH meter, X-ray diffraction (XRD), scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP). The results revealed that adding sodium citrate or citric acid could promote the large amount of 5 Mg(OH)2·MgSO4·7H2O generation and improve the water resistance of MOS cement. The incorporation of sodium citrate or citric acid caused a reduction in the total porosity and the volume fraction of large pores (>100 nm) in MOS cement, as well as an increase in the most probable aperture and the volume fraction of small capillary pores (10 nm–100 nm). In addition, the setting time of MOS cement with sodium citrate or citric acid was longer than that without sodium citrate or citric acid.