Research has been conducted into the diagenesis of the Luxembourg Sandstone. Literature studies were followed by a visit to the outcrop, after which thin sections were studied. The Luxembourg Sandstone Formation has been deposited in the Hettangian and Sinemurian, both lower Jurassic ages. A sea strait connecting the Northern German Basin and the Paris Basin was located in present day Luxembour...

Core samples from Middle Silurian pinnacle reefs in northern Michigan exhibit a regionally consistent assemblage of late diagenetic phases including geopetal diagenetic sediment, disseminated pyrite, pyrobitumen, rhombic dolomite cement, and equant calcite spar. High (>80°C) fluid inclusion homogenization temperatures and inclusions of Silurian-sourced oil in these diagenetic phases indicate th...

Glass ionomer cements show great potential as low cost, minimally invasive dental restorative materials. However, their use is limited by relatively poor mechanical properties, especially fracture toughness. One possibility for improving their fracture toughness is through the addition of fluorhydroxyapatite nanoparticles, which resemble the crystals found in tooth enamel. Hydroxyapatite and fl...

Using more than 1000 thin section photos of ancient (Phanerozoic) carbonates from different marine environments (pelagic to shallow-water) a new numerical methodology, based on digitized images of thin sections, is proposed here. In accordance with the Dunham classification, it allows the user to automatically identify carbonate textures unaffected by post-depositional modifications (recrystall...

Cement-based cementitious materials present an alkaline environment and mainly exist in the form of Ca(OH)2. Phosphogypsum, as a retarder materials, is often added to cement instead gypsum, fluorine by-product phosphogypsum also fixed CaF2. These cement-based serve environments containing carbonate groundwater, which changes stability solidified This paper studied solid liquid Ca(OH)2-CaF2, Ca(...

A review of the impacts of deicers used in winter maintenance practices of Portland cement concrete and asphalt concrete roadways and airport pavements is presented. Traditional and relatively new deicers are incorporated in this review, including sodium chloride, magnesium chloride, calcium chloride, calcium magnesium acetate, potassium acetate, potassium formate, sodium acetate, and sodium fo...

The effect of alumina and carbonates on magnesium silicate hydrate (M-S-H) cements was investigated at high Mg/Si ratios (1.5–2.5), constant Na2CO3 concentration (17 g/L) Al/Si ratio either 0, 1 or 3.2. Either MgO MgO/hydromagnesite (50/50 wt %) used, as well silica fume, metakaolin amorphous Al2O3. Thermogravimetric analysis (TGA), X-ray diffraction (XRD), 29Si 27Al MAS NMR data showed that M-...

The durability of cementitious materials is significant concerning long-term performance. Nanomaterials are promising candidates for deep refinement cement durability. Hydrophobic calcium carbonate a widely applied and easily accessible nanomaterial. However, its hydrophobicity poor dispersity in water prohibit direct application materials. In this study, hydrophobic nanoparticles (HbCC) were m...