Journal
CEMENT AND CONCRETE RESEARCH
Volume 161, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2022.106952
Keywords
Hydration kinetics; Tartaric acid; Premature setting; Isothermal calorimetry; Quantitative X-ray diffraction
Funding
- National Natural Science Foundation of China [51974352]
- China University of Petroleum (East China) [2018000025, 2019000011]
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This study investigated the effect of tartaric acid on the early-age hydration of oil well cement at high temperatures using isothermal calorimetry, thermogravimetric analysis, and quantitative XRD analysis. The results showed that a high dosage of tartaric acid can change the shape of the cement hydration curve and cause premature setting. Additionally, the dosage of tartaric acid also influenced the ultimate hydration extent of the cement.
In order to study the abnormal viscosity evolution behavior of oil well cement slurries containing tartaric acid, the influence of tartaric acid on the early-age hydration of oil well cement at high temperatures was investigated by isothermal calorimetry (IC), thermogravimetric analysis (TGA) and quantitative XRD (QXRD) analysis in the temperature range of 60 degrees C to 89 degrees C. Results show that, a high dosage of tartaric acid can fundamentally change the typical shape of the cement hydration heat flow curve - two additional exothermic peaks associated with aluminate phase hydration (C3A and C4AF) appear before the main hydration peak. The unsynchronized hy-dration of the aluminate phases and the silicate phases was found to be the cause of premature setting. Addi-tionally, long-term curing study (up to 28 d) showed that increasing the dosage of tartaric acid decreased the ultimate hydration extent of C2S while it increased the ultimate hydration extent of C4AF.
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