Hydration products and thermokinetic properties of cement-bentonite and cement-chalk mortars
Bentonite and chalk are the most popular auxiliary additives to portland cement for borehole cementation. The authors studied by physicochemical analysis methods (x-ray phase, derivatographic, and scanning and electron microscopy in combination with microdiffraction) the newly formed solid-phase composition of cement-bentonite and cement-chalk mortars (binder-additive ratio 9:1) prepared from portland cement for cold boreholes and 8% calcium chloride solution at a water-mixing ratio of 0.9. The mechanism of the influence of Ca-bentonite and chalk additives on the portland cement hydration rate was ascertained from the heat evolution rate curves. It was found that the phase compositions of the hydration products are represented in the studied systems by newly formed substances typical for portland cement. It has been noted that Ca-bentonite interacts with the calcium hydroxide of hydrated cement with the formation of hexagonal and cubic calcium hydroaluminates. Unlike Ca-bentonite, chalk does not react with portland cement at normal and reduced temperatures, does not block hydrated cement particles, which, in turn, ensures all other conditions remaining equal, a higher initial rate of hydration of cement-chalk mortar.
- OSTI ID:
- 6306925
- Journal Information:
- J. Appl. Chem. USSR (Engl. Transl.); (United States), Vol. 61:3; Other Information: Translated from Zh. Prikl. Khim.; 61: No. 3, 532-536(Mar 1988)
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
BOREHOLES
CEMENTING
MORTARS
STRUCTURAL CHEMICAL ANALYSIS
NATURAL GAS WELLS
PORTLAND CEMENT
HYDRATION
ADDITIVES
BENTONITE
CALCIUM CHLORIDES
CALORIMETRY
CRYSTAL STRUCTURE
DIFFERENTIAL THERMAL ANALYSIS
HEAT TRANSFER
LIMESTONE
PHASE STUDIES
SCANNING ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
BUILDING MATERIALS
CALCIUM COMPOUNDS
CALCIUM HALIDES
CARBONATE ROCKS
CAVITIES
CEMENTS
CHLORIDES
CHLORINE COMPOUNDS
CLAYS
COHERENT SCATTERING
DIFFRACTION
ELECTRON MICROSCOPY
ENERGY TRANSFER
HALIDES
HALOGEN COMPOUNDS
MATERIALS
MICROSCOPY
ROCKS
SCATTERING
SEDIMENTARY ROCKS
SOLVATION
THERMAL ANALYSIS
WELLS
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