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Asia
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GeoRef Categories
Era and Period
Epoch and Age
Date
Availability
calcium sulfate
Evaporite weathering and deposition as a long-term climate forcing mechanism Available to Purchase
Reaction pathways and textural aspects of the replacement of anhydrite by calcite at 25 °C Open Access
Location and stability of europium in calcium sulfate and its relevance to rare earth recovery from phosphogypsum waste Available to Purchase
Unraveling the Sulfate Sources of (Giant) Gypsum Crystals Using Gypsum Isotope Fractionation Factors Available to Purchase
Images from Curiosity: A New Look at Mars Available to Purchase
ChemCam: Chemostratigraphy by the First Mars Microprobe Available to Purchase
Determining Mineralogy on Mars with the CheMin X-Ray Diffractometer Available to Purchase
Carboxylic acids: effective inhibitors for calcium sulfate precipitation? Open Access
Spectral properties of Ca-sulfates: Gypsum, bassanite, and anhydrite Available to Purchase
The crystal structure of gypsum-II determined by single-crystal synchrotron X-ray diffraction data Available to Purchase
Sulfur on Mars Available to Purchase
Thermal behaviour and kinetics of dehydration in air of bassanite, calcium sulphate hemihydrate (CaSO 4 ·0.5H 2 O), from X-ray powder diffraction Available to Purchase
A comparison of Khuff and Arab reservoir potential throughout the Middle East Available to Purchase
Study of particle fluxes in the Broken Spur hydrothermal vent field (29 degrees N, Mid-Atlantic Ridge) Free
Pseudomorphs after evaporitic minerals interbedded with 2.2 Ga stromatolites of the Yerrida basin, Western Australia: Origin and significance Available to Purchase
Fibrous Calcium Sulfate in Veins: ABSTRACT Free
Relationships of modern gypsum nodules in sabkhas of loess to compositions of brines and sediments in northern Egypt Available to Purchase
Major-element geochemistry of brines from the Wind tidal flat area, Laguna Madre, Texas Available to Purchase
Primary gypsum nodules in a modern sabkha on the Mediterranean coast of Egypt Available to Purchase
Petrology of Concrete Affected by Cement-Aggregate Reaction Available to Purchase
Abstract The permanence of concrete in engineering structures is jeopardized where highalkali portland cement is used with aggregates containing opal, chalcedony, tridymite, intermediate to acidic volcanic rocks, or some phyllites. First recognized in 1938, deterioration caused by cement-aggregate reaction is characterized by cracking, expansion, and decline in strength and elasticity of the concrete. Petrographic and petrologic methods have contributed significantly to the investigation of cement-aggregate reaction. Microscopic criteria serve to distinguish between this and other types of deterioration. Petrographic examination of concrete aggregates can be used to predict their potential reactivity. Physical-chemical conditions contributing to the deterioration were explored by petrologic and geochemical methods. The mechanism by which reaction between rocks and minerals and the alkalies of cement causes this destruction is explained. Essentially i t consists of osmotic pressures produced by the formation and hydration of alkalic silica gels, which arise from interaction of alkalies and certain aggregates.