0019-1035/$ see front matter 2010 Elsevier Inc. A doi:10.1016/j.icarus.2010.06.001 * Corresponding author. Address: 425 Space Science Ithaca, NY 14853, USA. E-mail address: [email protected] (J.J. Wray The region surrounding the Mawrth Vallis outflow channel on Mars hosts thick layered deposits containing diverse phyllosilicate minerals. Here we report detection of the Ca-sulfate bassanit...

Water of hydration plays an important role in minerals, determining their crystal structures and physical properties. Here ultrafast nonlinear infrared (IR) techniques, two-dimensional infrared (2D IR) and polarization selective pump-probe (PSPP) spectroscopies, were used to measure the dynamics and disorder of water of hydration in two minerals, gypsum (CaSO4·2H2O) and bassanite (CaSO4·0.5H2O)...

The mineral calcium sulphate transforms from anhydrite through bassanite to gypsum and then can convert back to bassanite and anhydrite. This transformation of calcium sulphate causes volume change that adds to the potential hazards with indigenous soils containing expansive clay minerals. Heave and settlement are the most important geotechnical problems associated with many argillaceous soils ...

Recycled concrete aggregates and mixed recycled aggregates are specified as types of aggregates with lower densities, higher water absorption capacities, and lower mechanical strength than natural aggregates. In this paper, the mechanical behaviour and microstructural properties of natural aggregates, recycled concrete aggregates and mixed recycled aggregates were compared. Different specimens ...

Introduction: Sulfate species were verified by Pathfinder in 1997 and more recently by the Mars Exploration Rovers (MER). The best evidence for sulfates on Mars came from the Opportunity rover in Meridiani Planum, where data supporting the existence of Ca and Mg-sulfates were collected from alpha-proton X-ray spectroscopy and thermal emission spectroscopy [1,2]. Hyperspectral VNIR OMEGA images ...

MIL03346 meteorite: It is a martian meteorite (nakhlite) collected from Miller Range, Antarctica. It contains variety of hydrous Caand Fe 3+ -sulfates, and other H2O/OH-bearing species, thus has been extensively studied, with a purpose to build the links to aqueous alteration processes on Mars [4-9]. The martian origin of Ca-sulfates and jarosites in MIL 03346 is validated by the finding of the...

We study how a manufacturer’s recycled content claim decision is impacted by demand for recycled content through environmentally preferable purchasing (EPP) programs and supply uncertainty. We model a manufacturer making a recycled content commitment that can commit to a minimum recycled content that holds for every period (product specific claim), or an average recycled content across periods ...

Abstract. A rich association of primary guano minerals, including taranakite, hydroxylapatite, brushite and gypsum with relicts illite, kaolinite, alpha (low) quartz calcite, was identified in the fossil bat deposit from Gura Dobrogei Cave, Dobrogea County, Romania. Gypsum Ca phosphates developed preferentially on carbonate bedrock or fallen blocks mass, whereas taranakite clay-rich, detritic s...

since reusing waste tire as a cheap filler is considerably high, in this study, recycled rubber to replace nr/br is used up to 15 phr and the positive and negative aspects of the rubber powder and reclaimed rubber in the physical, dynamical and processing properties are evaluated. the results showed that in the presence of recycled rubber, the cure rate, crack growth resistance, tear strength a...

Sweden’s concrete waste is recycled for use in low-utility purposes such as in the construction of sub-bases in roads but hardly as aggregates in new concrete. To analyse the potential for high-utility recycling, a literature study was conducted on the regulatory instruments, building standards, production and properties of recycled concrete aggregates and the recycled aggregate concrete for Sw...