Early hydration and setting of oil well cement

A broad experimental study has been performed to characterize the early hydration and setting of cement pastes prepared with Class H oil well cement at water-to-cement ratios (w/c) from 0.25 to 0.40, cured at temperatures from 10 to 60 °C, and mixed with chemical additives. Chemical shrinkage during...

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Bibliographic Details
Published in:Cement and concrete research 2010-07, Vol.40 (7), p.1023-1033
Main Authors: Zhang, Jie, Weissinger, Emily A., Peethamparan, Sulapha, Scherer, George W.
Format: Article
Language:English
Subjects:
A. Hydration
A. Kinetics
A. Workability
ADDITIVES
AMBIENT TEMPERATURE
Applied sciences
BUILDING MATERIALS
Buildings. Public works
C. Shrinkage
Cement concrete constituents
CEMENTS
CHEMICAL ANALYSIS
D. Admixture
Exact sciences and technology
GRAVIMETRIC ANALYSIS
HYDRATION
HYDROGEN COMPOUNDS
KINETICS
MATERIALS
MATERIALS SCIENCE
NUCLEATION
Oil wells
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
Pastes
Properties of anhydrous and hydrated cement, test methods
QUANTITATIVE CHEMICAL ANALYSIS
Reagents
SHRINKAGE
SOLVATION
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
Ultrasonic testing
VELOCITY
VISCOSITY
WATER
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Summary:A broad experimental study has been performed to characterize the early hydration and setting of cement pastes prepared with Class H oil well cement at water-to-cement ratios (w/c) from 0.25 to 0.40, cured at temperatures from 10 to 60 °C, and mixed with chemical additives. Chemical shrinkage during hydration was measured by a newly developed system, degree of hydration was determined by thermogravimetric analysis, and setting time was tested by Vicat and ultrasonic velocity measurements. A Boundary Nucleation and Growth model provides a good fit to the chemical shrinkage data. Temperature increase and accelerator additions expedite the rate of cement hydration by causing more rapid nucleation of hydration products, leading to earlier setting; conversely, retarder and viscosity modifying agents delay cement nucleation, causing later setting times. Lower w/c paste needs less hydration product to form a percolating solid network (i.e., to reach the initial setting point). However, for the systems evaluated, at a given w/c, the degree of hydration at setting is a constant, regardless of the effects of ambient temperature or the presence of additives.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2010.03.014