American Society of Civil Engineers


Static Carbonation of Oil-Well Cements under Different Conditions


by E. Grabowski, (Res. Assoc., Dept. of Civ. Engrg., Univ. of Calgary, Calgary, Alberta, Canada T2N 1N4) and J.E. Gillott, (Prof., Dept. of Civ. Engrg., Univ. of Calgary, Calgary, Alberta, Canada T2N 1N4)

Journal of Materials in Civil Engineering, Vol. 2, No. 4, November 1990, pp. 183-201, (doi:  http://dx.doi.org/10.1061/(ASCE)0899-1561(1990)2:4(183))

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Document type: Journal Paper
Abstract: Thermal oil-well cement blends containing 40% silica in the form of fume, flour, and sand exhibit changes in their compressive strength and water permeability when cured in a static CO2 atmosphere. The magnitude of the effect of CO2 on cement-silica blends depends on the type of silica used and on the curing period. It has been confirmed that high early (seven-day) strength mixes are more durable in a static CO2 atmosphere and have higher ultimate strengths. Water permeability is affected only at early ages of up to 28 days. In a CO2 atmosphere, permeability is reduced slightly for blends with silica flour and with silica fume and sand; values are increased markedly for fume and fume-flour mixes. The differences in these engineering properties are explained in terms of competition for calcium hydroxide between carbonation and pozzolanic reactions, and types and amounts of calcium carbonates formed. Products formed hydrothermally (7 days at 230°C and 2.75 MPa) from partially or fully hydrated cement-silica blends, e.g., xonolite, gyrolite, and scawtite, seemed completely resistant to static CO2 under the hydrothermal conditions used. Differences in strength and permeability between CO2-treated mixes containing different types of silica follow the behavior observed for corresponding samples precured in the fog room.


ASCE Subject Headings:
Carbonation
Cement
Chemicals
Curing
Heated water
Material properties
Permeability
Silica
Strength
Structures