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These test methods cover the physical testing of gypsum, gypsum plasters, and gypsum concrete. Test methods are detailed for the following: precautions for physical tests, reagents and materials, free water, fineness, normal consistency of gypsum plaster and gypsum concrete, setting time, setting time (temperature rise method), …
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Gypsum can significantly enhance the UCS and CBR of soils, particularly high-plasticity and expansive clays. The increase in strength is primarily attributed to the cation exchange capacity and formation of cementitious hydration products.
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and contents of gypsum were incorporated into MOCP, and their early-ages exotherm characteristics were tested and analyzed. Meanwhile, the hydration kinetic parameters of gypsum-modied MOCP were calculated, and the inuence mechanism of gypsum on the hydration process of MOCP was discussed. Experimental details …
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Gypsum, from either nature or industrial by-products, can be a lower-cost and cleaner alternative binder to Portland cement used in construction projects, such as affordable housing in developing countries. Although various building products have successfully used gypsum as the binder, some drawbacks of this material have still …
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Gypsum is commonly applied as an ameliorant but there are few field studies into its long-term (> 10 years) effects on soil chemistry, especially at depths greater than …
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The aging properties of gypsum extracted from two underground mines in France (Livry–Gargan and Grozon) have been highlighted by means of observation performed using scanning electron microscopy on samples taken along horizontal boreholes drilled through to the middle of several pillars. ... The Science of the Total …
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The asymmetrical Hot Plate method was mainly used to characterize cork–gypsum composite. • A comparative study based on other experiments is performed. • Thermal conductivity results were confronted to different theoretical models. • The composite is three times more insulating and two times lighter than gypsum. •
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DOI: 10.1016/J.CONBUILDMAT.2016.08.120 Corpus ID: 138047321; Impact of accelerated climatic aging on the behavior of gypsum plaster-straw material for building thermal insulation
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ELSEVIER Chemical Geology 142 (1997) 1-10 CHEMICAL GEOLOGY lNCLUD/NG ISOTOPE GEOSCIENCE Minor and trace element analyses on gypsum: an experimental study Feng H. Lu *, William J. Meyers, Martin A.A. Schoonen Department of Earth and Space Sciences, State University of New York, Stony Brook, NY 11794, USA …
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The gypsum-hemihydrate transformation has been long studied as a laboratory analogue for seismogenic dehydration reactions during subduction 8, 9 and …
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The present work investigated the differences in the composition and internal microstructure of four types gypsum rock—fiber gypsum, transparent gypsum, alabaster, …
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The synthesis of α-calcium sulfate hemihydrate (α-CSH) from flue gas desulfurization (FGD) gypsum is a good way to realize the comprehensive utilization of FGD gypsum.To obtain α-CSH with the satisfactory performances, a facile hydrothermal-aging pretreatment process for FGD gypsum raw materials was proposed, where FGD …
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The present paper addresses the gypsum hydration study with the theoretical and experimental method. The microstructure of gypsum changes during the hydration …
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The study was supported by aging investigation using thermodynamic and kinetic analyzes. ... The effects of these additives on the physical and mechanical properties of the experimental gypsum ...
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The present paper investigates aspects of the crystallization of gypsum dihydrate during the artificial "aging" of calcined gypsum binder. On the basis of these data, it then describes …
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The aging properties of gypsum extracted from two underground mines in France (Livry–Gargan and Grozon) have been highlighted by means of observation performed using scanning electron microscopy ...
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This article provides a notes on the Gypsum Requirement (GR) of soil. The main principle for the reclamation of sodic or alkali soils is to replace exchangeable Na by another cation calcium (Ca 2+).Of all calcium compounds, gypsum (CaSO 4.2H 2 O) is considered the best and cheapest for the reclamation purpose. Calcium (Ca 2+) solubilized from …
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Proton NMR experiment. 1 H NMR experiment was made on a Niumag Rock Core Analyzer operating at 2 MHz. After mixing, the paste was poured ... which includes a retardation effect within the first several hours and an enhancement effect in the later age. As seen, the addition of gypsum significantly lengthens the induction period …
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1. Introduction1.1. General context. Gypsum plaster is an inorganic binder that is prepared in a two-step process. The first step is dehydration: heated to 100–200 °C, gypsum (CaSO 4 ·2H 2 O) releases water as vapor [1, 2] and, depending on temperature and water vapor partial pressure (p H2O) [3, 4] forms either hemihydrate (CaSO 4 •½H 2 …
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The results indicated that mercury could be released from desulfurization gypsum during aging process and the release process could be promoted via ultraviolet irradiation. The release amount increased with the irradiation time and intensity (up to 25.1% of the total initial amount). ... This work was kindly co-funded by the National …
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The polymer and the aerogel are used as additives in the weight fraction, up to1% of pure gypsum and the microspheres in the weight fraction, up to 10% of gypsum. The water-to-gypsum ratio was at ...
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The rural and monumental architecture of Northern Spain gives testimony of the wide-ranging constructive possibilities of traditional gypsum for exterior and structural applications. However, today, gypsum is only used for finishing purposes. By combining a bibliographic review with local visits/interviews and experimental gypsum calcinations, …
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Gypsum-rich horizons can occur under a wide range of soil climates if the parent material is gypsum-rich bedrock, as in cold regions of Russia where outcropping rock gypsum of Permian age produces prominent karst landscapes and gypseous soils (Goryachkin and Shavrina, 1997, Goryachkin et al., 2003, Kliment'ev et al., 2007).
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Gypsum is about 10 times more soluble in water than limestone. Gypsum can be found more than 100 feet below the ground or in some cases at the ground surface. This gypsum mine is found at the ground surface near the Northern coast of the Greek Island of Crete. Large gypsum crystals have been discovered in the Naica Mine in Chihuahua, Mexico.
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Blood concentration of taurine declines with age in mice, monkeys, and humans. To investigate whether this decline contributes to aging, we orally fed taurine or a control solution once daily to middle-aged wild-type and male C57Bl/6J mice until the end of life. Taurine-fed mice of both sexes survived longer than the control mice.
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First study of gypsum single crystal dehydration using X-ray absorption tomography. • Evidence and mechanism of a multi-scale crack pattern due to structure …
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During the experiment, the particle diameter distribution of aqueous suspensions of building and synthetic gypsum particles (before and after calcination) was determined using the Fraunhofer laser ...
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The perfect agreement between the model value from equation (5) and the experimental data shows clearly the validity of the proposed model. Figure 5: Results of the influence of water on void fraction of gypsum. Conclusion The present paper addresses the gypsum hydration study with the theoretical and experimental method.
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DOI: 10.1016/J.FUEL.2017.12.120 Corpus ID: 102685130; Mercury release and fraction transformation during desulfurization gypsum aging process (UV irradiation) @article{Diao2018MercuryRA, title={Mercury release and fraction transformation during desulfurization gypsum aging process (UV irradiation)}, author={Xingzhong Diao and …
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Batch experiments were conducted to collect data for obtaining insights into the chemical mechanisms and kinetics of red mud neutralization by both atmospheric (passive treatment) and injected CO2 (active treatment) in the absence and presence of gypsum. Active treatments allowed effective sequestration of CO2 within 1 h. A mixing …
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The aging properties of gypsum extracted from two underground mines in France (Livry–Gargan and Grozon) have been highlighted by means of observation …
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The 'counterclockwise' study. Imagine, for a moment, living in a nursing home. Your meals are in a cafeteria, your recreation is at scheduled times, and you're surrounded by other old people ...
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Flue-gas desulphurization (FGD) gypsum is a highly prevalent industrial by-product worldwide, which can be an excellent alternative to natural gypsum due to its high content of CaSO4·2H2O. The preparation of α-calcium sulfate hemihydrate is a high-value pathway for the efficient use of FGD gypsum. Here, a dynamic method, or an improved …
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Based on previous work on a lime-straw composite [12], four mixtures using two water/binder (W/B = 1.1 and 1.6) and three straw/binder (S/B = 0.2, 0.3, 0.4) ratios were tested to find the optimal composite with the lowest thermal conductivity and mechanical strength under its own weight in accordance with the European standard. Three sample …
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The aging of gypsum binder was carried out during storag e at temperature of 20 0 С and relative . ... Experimental data are considered concerning growth of calcium sulfate (gypsum) crystals from ...
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In vitro aging study. Cylindrical samples (n = 3) (6 mm diameter, 12 mm length) of different cement groups were produced for in vitro aging experiment using a split Teflon mold. After setting, specimens were incubated in 20 ml PBS (MP Biomedicals, LLC. Solon, OH) without stirring at 37 °C for 14 and 28 days.
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