The gypsum-anhydrite rocks in the abandoned quarry at Dingwall (Nova Scotia, Canada) are subjected to physical and chemical weathering, including hydration of anhydrite, i.e., its transformation into secondary gypsum under influence water. This process is known lead localized volume increase rock formation spectacular landforms: domes, tepees ridges. Cavities appearing interior these domes ofte...

The infiltration behaviour of CaO-MgO-Al2O3-SiO2 (CMAS) in Electron Beam Physical Vapour Deposited (EB-PVD) 7 wt% yttria stabilised zirconia (7YSZ) under controlled atmospheres (dry, wet and sulphurizing) was studied detail. microstructure the CMAS-infiltrated 7YSZ CMAS residue on top were analysed to interpret corrosion mechanisms. One major goals investigate stability CaSO4 into columns. At t...

High-belite sulfoaluminate cement (HBSC) clinker containing brownmillerite was prepared using the industrial raw materials limestone, aluminum tailings, ore waste rock, and anhydrite. The effect of on sintering minerals mechanical performance HBSC investigated thermal analysis, petrographic quantitative X-ray diffraction (QXRD). Results indicated that promoted formation stabilized calcium (C4A3...

At mid-ocean ridges (MORs), seawater carrying dissolved sulfate (SO4) infiltrates the oceanic crust. Hydrothermal fluid emissions from such systems have much lower ?34S and sulfur is mostly present as reduced sulfide, albeit in total concentrations than seawater. This has been explained by anhydrite formation reduction based on petrographic evidence mass balance considerations. Here, we utilize...

A high-speed railway viaduct experienced a sustained heave at high rates after its construction. The pillars of the bridge are founded on an Eocene hard anhydritic-gypsiferous claystone by means of massive foundations. Field investigations identified an active layer below the piles’ tips where expansions occur as a result of gypsum crystal growth in discontinuities from supersaturated aqueous s...