A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Isothermal calorimetry study of the effect of citric acid on the hydration kinetics of magnesium oxysulfate cement
Highlights The hydration kinetics of MOS with citric acid was evaluated via isothermal calorimetry. The hydration kinetics of MOS cement was modeled with a scale factor model. The individual reaction order in CA and apparent activation energy was obtained.
Abstract The hydration kinetics of magnesium oxysulfate cement (MOS) with and without citric acid (CA) was evaluated via isothermal calorimetry. A series of tests were conducted with different MgSO4 solution-to-MgO ratios (r) and MgO with different activities at 15 °C and 25 °C. The test results indicated that the effect of CA on the overall cement hydration rate was determined by the CA dose (w) primarily and can be simulated by a generalized scale factor model. The heat flow and cumulative heat evolution of slurries with different CA dosages could be accurately predicted using the scale factor (f) model. There was a linear relationship between lgf and lg(w/w 0), so the individual reaction order in CA could be obtained. The effect of temperature on the hydration kinetics of MOS cement with and without CA was modeled with the original scale factor model developed from the Arrhenius equation, and the apparent activation energy obtained was 66.3 and 74.9 kJ/mol, respectively. This study provided a basis for further in-depth research of the kinetic mechanism of the MOS hydration reaction.
Isothermal calorimetry study of the effect of citric acid on the hydration kinetics of magnesium oxysulfate cement
Highlights The hydration kinetics of MOS with citric acid was evaluated via isothermal calorimetry. The hydration kinetics of MOS cement was modeled with a scale factor model. The individual reaction order in CA and apparent activation energy was obtained.
Abstract The hydration kinetics of magnesium oxysulfate cement (MOS) with and without citric acid (CA) was evaluated via isothermal calorimetry. A series of tests were conducted with different MgSO4 solution-to-MgO ratios (r) and MgO with different activities at 15 °C and 25 °C. The test results indicated that the effect of CA on the overall cement hydration rate was determined by the CA dose (w) primarily and can be simulated by a generalized scale factor model. The heat flow and cumulative heat evolution of slurries with different CA dosages could be accurately predicted using the scale factor (f) model. There was a linear relationship between lgf and lg(w/w 0), so the individual reaction order in CA could be obtained. The effect of temperature on the hydration kinetics of MOS cement with and without CA was modeled with the original scale factor model developed from the Arrhenius equation, and the apparent activation energy obtained was 66.3 and 74.9 kJ/mol, respectively. This study provided a basis for further in-depth research of the kinetic mechanism of the MOS hydration reaction.
Isothermal calorimetry study of the effect of citric acid on the hydration kinetics of magnesium oxysulfate cement
Pang, Xiujiang (author) / Liu, Huanyu (author) / Chen, Li (author) / Yuan, Yanguang (author) / Liu, Xixue (author) / Pang, Xueyu (author) / Liu, Yuan (author)
2022-12-10
Article (Journal)
Electronic Resource
English
Effects of Material Ratio, Fly Ash, and Citric Acid on Magnesium Oxysulfate Cement
| British Library Online Contents | 2014
Effects of Material Ratio, Fly Ash, and Citric Acid on Magnesium Oxysulfate Cement
| Online Contents | 2014