High-temperature cement compositions--pectolite, scawtite, truscottite, or xonotlite: Which do you want

Journal Article · Fri Jul 01 04:00:00 EDT 1983 · J. Pet. Technol.; (United States)

DOI:https://doi.org/10.2118/9286-PA· OSTI ID:5656763

Eilers, L H; Moran, L K; Nelson, E B

The crystalline nature of hydrated Portland cement is dependent primarily on temperature. The calcium silicate hydrate (CSH) gel is produced at low temperatures and, upon curing at higher temperatures, will convert to one or more crystalline phases. The better cementing compositions contain a low lime-to-silica (C/S) ratio. Xonotlite is a phase commonly produced above 150/sup 0/C (302/sup 0/F) when approximately 35% fine silica is added to Portland cement. Generally, it has good strength but moderate permeability. Truscottite, produced when an even larger quantity of silica is added to the cement, has lower permeability than xonotlite but is slightly more difficult to produce and to stabilize. Pectolite can be produced by introducing sodium into a truscottite-type formulation. Once formed, pectolite is very stable but typically has high permeability. The addition of carbonate to any of these formulations may produce scawtite. Scawtite appears to be an inferior phase by itself, but in small quantities it can be helpful in strength development.

• Research Organization: Dowell Div., Dow Chemical Co.
• OSTI ID: 5656763
• Journal Information: J. Pet. Technol.; (United States), Journal Name: J. Pet. Technol.; (United States) Vol. 35:8; ISSN JPTJA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360600* -- Other Materials
ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
BUILDING MATERIALS
CALCIUM COMPOUNDS
CALCIUM SILICATES
CARBON COMPOUNDS
CARBONATE ROCKS
CARBONATES
CEMENTS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COLLOIDS
COMPARATIVE EVALUATIONS
CRYSTALLIZATION
DISPERSIONS
ELEMENTS
GELS
HYDRATES
LIMESTONE
MATERIALS
MECHANICAL PROPERTIES
METALS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PERMEABILITY
PHASE CHANGE MATERIALS
PHASE TRANSFORMATIONS
PORTLAND CEMENT
PRODUCTION
QUANTITY RATIO
ROCKS
SEDIMENTARY ROCKS
SILICA
SILICATES
SILICON COMPOUNDS
SILICON OXIDES
SODIUM
TEMPERATURE DEPENDENCE
TEMPERATURE EFFECTS
ULTIMATE STRENGTH