Topic
Calcium oxide
About: Calcium oxide is a research topic. Over the lifetime, 7600 publications have been published within this topic receiving 66104 citations. The topic is also known as: caustic lime & quicklime.
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TL;DR: In this paper, the effectiveness of using hedmanite (rockwool natural fibers) as filler in improving the performance of asphalt concrete pavements was evaluated and compared with the conventional asphalt mix containing crushed stone filler.
Abstract: This investigation was undertaken to evaluate the effectiveness of using hedmanite (rockwool natural fibers) as filler in improving the performance of asphalt concrete pavements, and to compare hedmanite with lime (as filler) modified mixes and the conventional asphalt mix containing crushed stone filler. In this study, optimum asphalt content was obtained by Marshall method and was used in all the modified mixes. The engineering properties, including resilient modulus, stability loss, split tensile strength, fatigue and permanent deformation, were determined. Results indicated that certain percentages of both hedmanite and lime are effective in improving the resilient modulus, while the Marshall stability loss and tensile strength loss were higher in hedmanite mixes than in lime mixes. Lime modified mixes showed better resistance to fatigue and rutting than hedmanite modified mixes. Results indicated that better quality asphalt concrete mixes can be prepared using lime rather than hedmanite as a filler.
22 citations
Patent•
18 Sep 1980
TL;DR: A process for synthesizing synthetic hydroxyapatite is described in this paper, which comprises thermally decomposing calcium carbonate, cooling the resultant calcium oxide, slaking the cooled calcium oxide and reacting the resulting calcium hydroxide with phosphoric acid.
Abstract: Hydroxyapatite is an inorganic component of skeletal tissues, such as bones and teeth. It is known to synthesise hydroxyapatite for use as implant materials, such as artificial bones, by the reaction of calcium hydroxide with phosphoric acid. Known synthetic hydroxyapatite is, however, not sufficiently like the naturally occurring material to be entirely satisfactory for use in providing implant materials. The invention provides a process for synthesising hydroxyapatite which comprises thermally decomposing calcium carbonate, cooling the resultant calcium oxide, slaking the cooled calcium oxide, and reacting the resulting calcium hydroxide with phosphoric acid. A filter cake of the synthetic hydroxyapatite thus produced is porous and contains crystals which can readily be sintered to provide a thermally stable ceramic material which is colorless or semi-transparent and useful in providing implant materials compatible with a living body.
22 citations
Patent•
13 Jun 2000
TL;DR: In this paper, a continuous preparation of calcium hydroxide slurry can be made on a mobile apparatus that uses an eductor to initially combine metered flows of calcium oxide and water.
Abstract: A continuous preparation of calcium hydroxide slurry can be made on a mobile apparatus that uses an eductor to initially combine metered flows of calcium oxide and water. The calcium hydroxide slurry is retained in a deaerating sump and then pumped into a serpentine centrifugal mixer so that the reaction of the calcium oxide and the water is safely complete. Because the apparatus allows the calcium hydroxide slurry to be recirculated into the deaerating sump, the slaking process can continue even when it is necessary to pause the discharge of slurry to change transport tankers.
22 citations
Patent•
31 Jan 2002
TL;DR: In this article, a glass composition, for producing an enamel coating highly resistant to mechanical, thermal and chemical corrosion, contains substantially no heavy metals and/or heavy metal compounds, and independent claims are also included for the following: (1) the production of the composition by mixing ceramic raw materials, free from heavy metals, comprising 0.0-4.0 wt.
Abstract: Glass composition, for producing an enamel coating highly resistant to mechanical, thermal and chemical corrosion, contains substantially no heavy metals and/or heavy metal compounds. Independent claims are also included for the following: (1) The production of the composition by mixing ceramic raw materials, free from heavy metals, comprising 0.0-4.0 wt.% lithium oxide (Li2O), 0.0-3.0 wt.% boron oxide (B2O3), 0.0-3.0 wt.% magnesium oxide (MgO), 0.0-2.0 wt.% aluminum oxide (Al2O3), 0.0-4.0 wt.% potassium oxide (K2O), 0.0-6.0 wt.% calcium oxide (CaO), 8.0-14 wt.% zirconium dioxide (ZrO2), 9.0-15.0 wt.% sodium oxide (Na2O), 55.0-75.0 wt.% silica (SiO2) and 0.0-2.5 wt.% colorants, then heating and fusing completing at 1200-1600 degrees C and conversion to a granulate after quenching; (2) Articles coated with this glass composition; (3) Articles or containers of iron and/or an iron alloy with an enamel coating highly resistant to mechanical, thermal and chemical corrosion, which contains substantially no heavy metals and/or heavy metal compounds.
22 citations
Journal Article•
TL;DR: In this article, the authors investigated the relation between the strength of LIME-stabilized soils and those of LABORATORY-CURED soils and concluded that a strength prediction based on 2 days at 120 F Laboratory CURING can be made with reasonable accuracy.
Abstract: THE STUDY INVESTIGATED THE POSSIBILITY OF ESTABLISHING A CORRELATION BETWEEN THE STRENGTHS OF FIELD-CURED SPECIMENS OF LIME-STABILIZED SOILS AND THOSE OF LABORATORY-CURED SPECIMENS. SEVERAL SETS OF SPECIMENS OF EACH SOIL WERE SUBJECTED TO FIELD CURING DURING DIFFERENT PARTS OF THE SPRING, SUMMER, AND FALL OF 1961, AND ONLY THE TEMPERATURE VARIABLE WAS INVESTIGATED. THE DATA WERE ANALYZED ON A STRENGTH VS MATURITY BASIS. THE RESULTS OBTAINED INDICATE THAT A STRENGTH PREDICTION BASED ON 2 DAYS AT 120 F LABORATORY CURING CAN BE MADE WITH REASONABLE ACCURACY. TEMPERATURE DATA RECORDED THROUGHOUT THE STUDY SUGGESTED SEASONAL LIMITS FOR LIME STABILIZATION. /AUTHOR/
22 citations