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Showing 1 to 20 of 64 for “"Calcium hydroxide"”.
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Crystal morphology and surface reactivity studies of calcium hydroxide
Calcium hydroxide samples, obtained as a precipitate from the mixing of solutions of sodium hydroxide with a variety of calcium salts in the optional presence of ethanol and a silylating agent, have been characterised by the techniques of nitrogen adsorption, water vapour adsorption , …
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Studies of the surface and bulk reactivity of calcium hydroxide
… of a number of commercially available samples of calcium oxide and hydroxide were investigated. 'Fresh' and 'aged' (Le. exposed to the atmosphere) samples were characterised by Fourier Transform Infra-Red Spectroscopy, Thermo-Gravimetric Analysis, Nitrogen Adsorption, Water Adsorption, Scanning …
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pH Stability of Calcium Hydroxide Preparations in a Simulated Acidic Environment
Background Calcium hydroxide (Ca(OH)₂) is a widely used intracanal medicament in endodontics, prized for its high pH, which provides antibacterial effects and promotes healing. However, its efficacy is challenged by the acidic pH of purulent exudates in infected root canals. This study aimed to …
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Stabilization of non-plastic soils with calcium hydroxide-calcium carbonate mixtures
The influence of calcium carbonate on the properties of four non-plastic lime-stabilized soils was studied. The four soils span a range in mica content and sand content. It was found that carbonate generally increased unconfined compressive strength and secant modulus of elasticity when included as …
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The effect of formocresol and calcium hydroxide on the dental pulps of rhesus monkeys
Indiana University-Purdue University Indianapolis (IUPUI)
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Fracture resistance of calcium hydroxide-treated teeth filled with water- and PBS-mixed MTA
… regeneration and apical barrier induction with calcium hydroxide (CH) or production by placement of calcium silicate materials e.g. Mineral Trioxide Aggregate (MTA) in the apical part of the root canal.MTA apexification can be undertaken as a one-visit treatment or two-visit treatment with a …
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Treatment of a multicomponent mining effluent using calcium hydroxide in a fluidized bed crystallizer
… The intention was to treat the wastewater with a calcium hydroxide (Ca(OH)2) suspension in a laboratory scale seeded fluidised bed crystallizer, thereby precipitating gypsum and magnesium hydroxide. The objectives of this study were to investigate how the chosen reactor configuration, feed stream …
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The Effects of Calcium Hydroxide Treatment of Sunflower Seeds on Ration Digestibility and Rumen Parameters in Holstein Steers
… sunflower seeds treated with three levels- of calcium hydroxide were compared using .a randomized complete block design. Forty-eight Holstein steers were fed one of six completely mixed rations consisting of (DM basis) 44% corn silage, 10% chopped alfalfa hay, and 46% concentrate mix. …
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Understanding effects of silicon/aluminum ratio and calcium hydroxide on chemical composition, nanostructure and compressive strength for metakaolin geopolymers
… to determine the effects of the Si/Al ratio and calcium hydroxide on the chemical composition and nanostructure for metakaolin geopolymers. The second was to determine how the composition and nanostructure correlate with mechanical properties of the geopolymer. For this study, the geopolymers …
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pH Change Following Smear Layer Removal and Final Rinse with 95% Ethyl Alcohol Using Calcium Hydroxide Medicament or BC Sealer
… rise in pH were noted in both ethanol positive calcium hydroxide groups. BC sealer maintained a pH higher than negative controls for the first 12 days before dropping to baseline levels. RDT was found to affect pH levels, with greater thicknesses correlating to lower pH values. Maximum pH values …
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Microbial Speciation And The Time Dependent Killing By Calcium Hydroxide Of The Microbiological Community Found In An Immature Necrotic Tooth With Apical Periodontitis
… of this study are to; determine the length of calcium hydroxide medication most appropriate for killing a biofilm sourced from a clinical case treated with a regenerative endodontic procedure, and characterize the bacterial community found in an infected tooth with clinical features of those …
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Mica stabilization with lime, portland cement and lime-calcium carbonate
… of lime, Portland cement, and combinations of calcium hydroxide and calcium carbonate. In order to trace the calcium carbonate and calcium hydroxide in the stabilized soil, x-ray diffraction analyses, differential thermal analysis, and thermagravimetric analyses were made. Results show the …
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Contemporary methods of treatment of injuries and their complications in immature permanent teeth in children
… the evaluation of endodontic treatment using calcium hydroxide materials in immature permanent teeth that have sustained traumas, especially after severe periodontal tissue injuries. - The aim of this work was: a. to analyze the factors that contribute to occurrence of post-traumatic …
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Characteristics and conditioning of anaerobically digested sludge from a biological phosphorus removal plant
… BPR anaerobically digested sludges was bound by calcium, magnesium, and iron phosphorus precipitates including hydroxyapatite, struvite, and vivianite. Calcium phosphorus precipitates were the most prevalent in both sludges, but the percentage of magnesium phosphorus precipitates increased with …
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The disposal of lime waste at the Dupont Waynesboro, Virginia plant
… settle rapidly, and the solids to contain 88% calcium hydroxide. It was found impractical to dispose of the slurry by draining in lime ponds for farm haulage, by drying with flue gases or by dumping it in the nearby South River. It was found feasible to dry the slurry for agricultural uses by …
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Verifying the Calcium Oxychloride Threshold in Cementitious Pastes
<p>Calcium oxychloride (CAOXY) formation is a serious deterioration mechanism known to cause joint damage in concrete pavements. CAOXY is the product of a chemical reaction between calcium chloride (CaCl2) or magnesium chloride (MgCl) deicing salts and calcium hydroxide in the cementitious matrix. …
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The Investigation of Nano Silica in the Cement Hydration Pro
… concrete mix designs. Nano silica reacts with calcium hydroxide (CH) to develop more of the strength carrying structure of cement: calcium silica hydrate (CSH). In this paper, relationships have been developed to distinguish the benefits when using different sizes of nano silica in cement …
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Methods for removing pharmaceuticals from human urine
… because the stabilization of human urine using calcium hydroxide increases the pH (˃12), resulting in hydroxide ions that degrade the pharmaceutical molecules while conserving urea; granular activated carbon adsorbs the pharmaceuticals and urea in human urine; the addition of hydrogen peroxide …
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Optimization of a Copper/Molybdenum Flotation Circuit by Depressing Pyrite from the Rougher Flotation Stage Using Different Scheme of Reagents
… collector, and sodium sulfite, zinc sulfate, calcium hydroxide and potassium dichromate as pyrite depressants from a literature review and expert suggestions. Of the reagents tested, potassium dichromate was included as a modification to simulate chrome grinding media effect. Some studies have …
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