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

Affiliation of Author(s):航空学院

Journal:CONSTRUCTION AND BUILDING MATERIALS

Key Words:Magnesium oxysulfate cement Sodium citrate Citric acid Mechanical strength Microstructure Water resistance

Abstract: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)-MgSO4.7H(2)O 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. (C) 2018 Elsevier Ltd. All rights reserved.

ISSN No.:0950-0618

Translation or Not:no

Date of Publication:2018-04-30

Co-author:Wang, Nan,Bi, Wanli,Tan, Yongshan,XT10370,Wu, Chengyou,mhy,Hua, Shi

Correspondence Author:yhf

Date of Publication:2018-04-30