An investigation into the effect of phosphate salts as a retarder For oil well cement slurry setting
Publish Year: 1391
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ICOGPP01_558
تاریخ نمایه سازی: 22 مرداد 1391
Abstract:
experimental study has been performed to characterize the early hydration and setting of cement pastes prepared with Class G oil well cement at water-to-cement ratios w/c = 0.35-40%, and mixed with phosphate salt as retarder, cured at 25oC. Chemical shrinkage during hydration was measured by system, degree of hydration was determined by thermo-gravimetric analysis. Setting time was tested by Vicat. A boundary nucleation and growth model provides a good fit to the chemical shrinkage data. Retarder and viscosity modifying agents decrease and less hydration products and delay cement nucleation, causing later setting times
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Authors
Zahra Nasirzade
Department of applied chemistry, Faculty of science, shiraz branch, Islamic Azad University, Shiraz, Iran
Hamid Reza Safaei
Department of applied chemistry, Faculty of science, shiraz branch, Islamic Azad University, Shiraz, Iran
Peyman Ghatee
Department of civil Engineer, Faculty of Engineering, shiraz branch, Islamic Azad University, shiraz, Iran
Hassan Nematollahi
Work-overdepartment, SZOGPC, Iran