Cement hydration kinetics study in the temperature range from 15 °C to 95 °C

Research on the Mechanical Integrity of Low-Density Cement Mortar

“…At the same time, the micro-silica inside the slurry quickly hydrates. All these have caused the air bubbles in the cement stone to be unable to be discharged, thereby increasing the porosity of the cement stone, causing its internal shrinkage and reducing its compressive strength (Liu et al, 2021;Munjal et al, 2021;Pang et al, 2021). Therefore, the compressive strength of the cement stone cured at 90 °C is lower than that of the cement stone cured at 60 °C.…”

Hydration kinetics of oil well cement in the temperature range between 5 and 30°C

“…It should be noted that the scale factor model has limited use in explaining the physical and chemical mechanisms of cement hydration, which is highly complex and has been the subject of considerable debate (Scherer et al, 2012;Karakosta et al, 2015;Pang and Meyer, 2016a;Pang and Meyer, 2016b;Ma and Kawashima, 2019;Pichler and Lackner, 2020). Nevertheless, the model can provide a fairly accurate simulation of the influence of temperature on cumulative heat evolution under a variety of curing conditions when applied in a numerical way (Pang et al, 2020;Pang et al, 2021). In this model, the relationship between temperature and the scale factor (C) can be described based on the Arrhenius formula (Pang et al, 2013a)…”

“…The specific method of calculating the scale factor includes the peak ratio method and the best fit method, which can be found in Pang et al (2013c). Although E a may be influenced by a number of different factors (Sun et al, 2021b), the use of a constant E a with a scale factor model has been proven to be quite accurate in predicting the hydration kinetics of oil well cement systems with an error of less than 3% (Pang et al, 2021), possibly because the low C 3 A (3CaO•Al 2 O 3 ) content reduced the system complexity.…”

“…Here, the rate constant could be parameters obtained by various cement hydration kinetics models or simply the peak hydration rate (Scherer et al, 2012;Pang and Meyer, 2016b;Pichler and Lackner, 2020;Pang et al, 2021). Previous studies found that the effect of certain accelerators and retarders (CaCl 2 , NaCl, KCl, and sucrose) on the cement hydration rate is similar to that of temperature and pressure, especially at relatively low concentrations (Pang et al, 2015;Sun et al, 2021b).…”

“…Calcium chloride (CaCl 2 ) has been used to improve the early compressive strength development of cement and shorten the setting time at low temperatures for many years, but a consensus about the mechanism of CaCl 2 promoting the hydration of cement has not been reached. Pang et al developed a scale factor model to simulate the influence of temperature on the hydration kinetics and property development of oil well cement (Pang et al, 2013c;Pang et al, 2020;Pang et al, 2021;Pang et al, 2022). It has been shown that the model can be employed to predict the temperature change of oil well cement when heat exchange with the environment is known (Pang et al, 2020).…”