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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 199 for “"gypsum"”.
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Feasibility of gypsum quarrying and gypsum-based construction product manufacturing in Egypt
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1983.
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Soil Gypsum Content Analysis of the Proposed Road Route Extension of FM 2185 in the Gypsum Plain, Culberson County, Texas
… main problems with gypsic soils is dissolution. Gypsum (CaSO<sub>4</sub>·2H<sub>2</sub>O) in soils dissolves easily creating voids which can be detrimental to the integrity of engineering structures. To mitigate this, it is important to determine the amount of gypsum present in soils, before …
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Effect of Time on Gypsum-Impression Material Compatibility
… was to evaluate the compatibility of dental gypsum with three recently introduced irreversible hydrocolloid (alginate) alternatives. The test materials were Alginot® (Kerrâ„¢), Position Penta Quick® (3M ESPEâ„¢) and Silgimix® (Sultan Dentalâ„¢). The irreversible hydrocolloid impression …
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Isotope Systematics of Gypsum and its Hydration Water
… analysis of the structurally-bound water in gypsum can provide a direct measure of past hydrologic variability. This thesis presents the development of the water extraction and isotopic measurement procedures, the calculation of the gypsum-water isotope fractionation factors, and the …
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Crack coalescence in molded gypsum and Carrara marble
… behavior in prismatic laboratory molded gypsum and Carrara marble specimens, which consist of either one or two preexisting open flaws, under uniaxial compression. In previous experimental studies, the determination of crack types (shear/tensile) was mainly based on the identification of …
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Comparative Studies On Standard and Fire-Rated Gypsum Wallboards.
… research is to improve the fire resistance of gypsum wallboard (GWB). Gypsum wallboard consists mainly of gypsum, i.e. calcium sulfate dihydrate, CaSO<sub>4</sub>•2H<sub>2</sub>O. In buildings, the chemical, mechanical and thermal properties of gypsum wallboard play an important role in …
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Preservation Potential of Permian Gypsum Beds, Nippewalla Group, USA
… chemical traces of organisms. The red-beds and gypsum were analyzed in order to assess their biomarker contents. Geochemistry similar to that found in the Nippewalla Group has been hypothesized to prevent the preservation of biomarkers due to the presence of hematite, which indicates oxidizing …
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Gypsum seeding to prevent scale formation and improve separation efficiency
… sulphate-rich brines using EFC often results in gypsum crystallization before any other species. This results in gypsum scaling on the cooled surfaces of the crystallizer, which is undesirable as it retards heat transfer rates and hence reducing the yield of other products. Gypsum crystallizes in …
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The stability of gypsum and anhydrite in the geologic environment
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology, 1954.
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Pedogenic gypsum of southern New Mexico: Genesis, morphology, and stable isotopic signature
… ratios of the hydration water of pedogenic gypsum and the delta18O/deltaD ratios of meteoric water. However, a pedogenic origin for the sampled gypsum was not clearly supported and the results from this procedure were not compared to other paleoclimatic indicators. Therefore, the goals of …
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Reclamation of fine-textured sodic soil using gypsum, langbeinite, and calcium chloride
The effects of various application rates of gypsum (Aqua-cal = finely ground gypsum), langbeinite (K₂SO₄.2MgSO₄), and CaCl₂ (anhydrous) on exchangeable Na removal and saturated hydraulic conductivity of a sodic soil were investigated under laboratory batch studies and laboratory column leaching …
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Speleogenetic Evolution and Geological Remote Sensing of the Gypsum Plain, Eddy County, New Mexico
<p>Permian evaporites of the Gypsum Plain region of the Delaware Basin host extensive karst phenomena, as well as unique diagenetic alterations of host strata. Because of the complex, poorly understood hydrogeologic system, little has been established concerning the relation and evolution of the …
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Effects of polyacrylamide (PAM) and gypsum on irrigated and dryland potatoes (Solanum tuberosum L.).
… irrigation, micronised polyacrylamide (PAM) and gypsum on the growth and yield of 'Ilam Hardy' potatoes in 2001-2002. At the final harvest, tuber yields were similar (59 500 kg ha⁻¹). Environmental factors dominated results, particularly January rainfall, which was 150% of the 16-year average. …
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Mercury Transportation in Soil Using Gypsum from Flue Gas Desulphurization Unit in Coal-Fired Power Plant
… investigates mercury flux in soil amended by gypsum from flue gas desulphurization (FGD) units of coal-fired power plants. There are two phases of this research, including field and greenhouse studies. Previous studies indicate that FGD gypsum could increase corn yield, but may lead to more …
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Developing a common Key performance indicators framework for biodiversity management in gypsum quarries throughout Europe for Eurogypsum
… (KPIs) framework to report biodiversity for the Gypsum Industry at the European level. An original approach of participatory process has been developed in order to integrate the different opinions and to reach a consensus framework between different stakeholders’ groups: - Eurogypsum stakeholders …
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Effect of flaw shape and penetrating fluids on hydraulic fracture initiation and propagation in porous material (gypsum)
… hydraulic fractures. For this purpose, prismatic gypsum specimens were tested under external biaxial loads and hydraulic pressurized flaws. Four type of flaw shapes were tested: 5 mm circular flaw, single vertical flaw, and 5 mm circular flaw with short notches (2.5 mm length), and with long …
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