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360 results for “Cements”
Study on a quantitative method for determining mixing proportion of transparent cemented soil for visual geotechnical model tests
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Data from: PMMA bone cement with L-Arginine/nano fish bone nanocomplex to generate apatite formation
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Research data supporting "Synthesis of phospho-amino acid analogues as tissue adhesive cement additives"
<p>Raw data supporting the publication:</p> <p>C. Spicer et al., Synthesis of phospho-amino acid analogues as tissue adhesive cement additives, 2020, ACS Central Science, DOI: 10.1021/acscentsci.9b01149</p>
Calcium aluminate cement conversion analysed by ptychographic nanotomography
<p><strong>Raw data for: </strong><strong><span>Calcium aluminate cement conversion analysed by ptychographic nanotomography</span></strong></p> <p><strong><span>doi: <a title="Persistent link using digital object identifier" href="https://doi.org/10.1016/j.cemconres.2020.106201" target="_blank" rel="noreferrer noopener"><span>https://doi.org/10.1016/j.cemconres.2020.106201</span></a></span></strong></p> <p><strong>Calcium aluminate cements are used for special applications but are nowadays banned for general structural purposes. This banning is due to the calcium aluminate hydrate conversion, that has led, for concretes fabricated with high water contents, to many building collapses. The stoichiometries of these conversion chemical reactions are relatively well established but the consequences in porosity, key to predict and ensure durability, were unknown. Here, we have used hard X-ray ptychographic nanotomography to study the hydration of CaAl<sub>2</sub>O<sub>4</sub> at different temperatures and chiefly, at 4ºC and then at 50ºC to provoke conversion similar to field conditions. T</strong><strong>he mass densities of the resulting Al(OH)<sub>3</sub> gels were 1.94, 1.98 and 2.23 g<sup>.</sup>cm<sup>-3</sup>, for samples hydrated at 4, 20 and 50ºC, respectively. These values are lower than that of gibbsite, 2.42 g<sup>.</sup>cm<sup>-3</sup>, the reference value used so far. Above all, this 3D imaging technique has allowed measuring the secondary water porosity developed in the conversion, which has an average pore dimension close to 140 nm. This work shows the way for porosity studies at the mesoscale in unaltered specimens.</strong></p>
FIGURE 5 in A new species of karst forest Bent-toed Gecko (genus Cyrtodactylus Gray) not yet threatened by foreign cement companies and a summary of Peninsular Malaysia's endemic karst forest herpetofauna and the need for its conservation
FIGURE 5. Google Earth photograph of Hutan Lipur Gunung Senyum, Pahang, Peninsular Malaysia.
OBTAINING CEMENT GRINDING INTENSIFIERS
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METHODS OF OBTAINING BOTH CEMENT AND ELEMENTARY PHOSPHORUS FROM PHOSPHORITES
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SULFATE-CONTAINING CEMENTS
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Raw data for "Accuracy in cement hydration investigations: combined X-ray microtomography and powder diffraction analyses" paper
<p>Raw data for "Accuracy in cement hydration investigations: combined X-ray microtomography and powder diffraction analyses" paper, including:</p> <p>- TG-DTA</p> <p>- X-ray diffraction data.</p> <p>- micro-CT data.</p>
The simulation results of relationship between cementation exponent m and total porosity of different diagenetic facies with different content of parameters
<p>The study of conduction mechanism is the key to establishing the subsequent physical derivations, resistivity simulation and saturation models. The purpose of this research is to clarify the conduction mechanisms under different diagenetic facies and build suitable saturation evaluation models. Experimental data of tight gas sandstone from the Ordos Basin were analysed, including data from scanning electron microscopy, conventional core physical property analysis, core casting thin section analysis, core mercury intrusion experiments, and rock electrical conductivity experiments. Accordingly, the diagenetic minerals of the study block were examined, the diagenetic facies were classified by differences in diagenetic properties across the study area. The reservoir was divided into 3 types of diagenetic facies: construction facies, cementation facies, and destruction facies. On this basis, the conductivity characteristics and saturation models of different diagenetic facies within the study area were systematically discussed for the first time. A number of experiments have shown that according to the type of diagenesis, the structure of the pores, and the influence of the reservoir, a classification scheme for diagenetic facies (consisting of construction, cementation, and destruction facies) can be established. According to the influence of the diagenesis of various diagenetic facies, theoretical pore structure models of the three diagenetic facies were established, in which the construction facies includes mainly dissolved feldspar pores and intergranular pores, the destruction facies includes clay residual intergranular pores and intergranular pores, and the cementation facies includes primarily residual intergranular pores. Based on these theoretical pore structure models, the construction facies was evaluated with a pore-connected vuggy conductivity model, the destruction facies was evaluated with a nonconnected matrix pore conductivity model, and the cementation facies was evaluated with a residual intergranular pore conductivity model. Then, the rationality of each model and the effects of the parameters in each model on the final cementation exponent were analysed by simulation. The predicted cementation exponents of the diagenetic facies match the measured cementation exponents well and can guide the qualitative understanding of these characteristics in such reservoirs.</p>
Dataset for: A novel hydrophobically associating water-soluble polymer utilized as constant rheology agent for cement slurry
During the process of well cementing in deepwater, the cement slurry experiences a wide range of temperature variation from low temperature at seabed to high temperature in downhole. The elevated temperature affects the rheology of cement slurry. The change of rheology of cement slurry could influence the safety of cementing operation. The aim of this paper is to develop a new kind of hydrophobically associating water-soluble polymer (KWHL-1) as an additive to prepare a constant rheology oil well cement slurry, which can be used at temperature range from 4℃ to 90℃. The acrylamide, 2-acrylamide-2-methylpropionic acid and stearyl methylacrylate were applied to synthesize the KWHL-1 by the inverse microemulsion polymerization. Test results indicate that the critical association temperature of KWHL-1 is 45℃. The critical association temperature is independent with KWHL-1 concentration, salt concentration and alkalinity of solution. When the temperature is below 45℃, KWHL-1 shows little influence on the viscosity of solution. When the temperature is above 45℃, the KWHL-1 forms spatial network structure by intermolecular hydrophobic association, and thus increases the viscosity of solution significantly. The KWHL-1 also displays good thermal stability and excellent salt and alkali resistance properties. In addition, the KWHL-1 shows nearly no negative influence on the basic properties of cement slurry, which indicates that the KWHL-1 can be used as a constant rheology agent to prepare a cement slurry with constant rheology in the temperature range of 4 to 90℃.
Data package for Cement with bacterial nanocellulose cured at reservoir temperature: Mechanical performance in the context of CO2 geological storage
<p>Data from experimental results and numerical modeling. The dataset is deposited in a .zip file or .xls(.xlsx) file format.</p> <p>Publication:</p> <p>Juan Cruz Barría, Diego Manzanal, Patricia Cerrutti, Jean-Michel Pereira,<br> Cement with bacterial nanocellulose cured at reservoir temperature: Mechanical performance in the context of CO2 geological storage,<br> Geomechanics for Energy and the Environment,<br> 2021,<br> 100267,<br> ISSN 2352-3808,<br> https://doi.org/10.1016/j.gete.2021.100267.<br> (https://www.sciencedirect.com/science/article/pii/S2352380821000356)<br> Keywords: CO2 geological storage; Cement paste; Bacterial nanocellulose; Reservoir temperature; Chemo-hydro-mechanical couplings</p> <p> </p> <p> </p>
Bond Strength Between Hybrid Materials and Resin Cements
<p><span>Background/Purpose:</span><span> This study aims to improve clinical practice and inform patients by evaluating the tensile strength of three adhesive variants: Silane, Universal Adhesive, and their combination, using resin cement between hybrid materials and composite resin.</span></p> <p><span>Materials and Methods:</span><span> Seventy-two samples made from CAD/CAM hybrid ceramic blocks and composite resin replicas were used, adhering to ISO standards. Adhesive techniques ([Si], [Ad], [SiAd]) were applied to hybrid materials [V] and [C]. Tensile tests were conducted with a Muver Electronic Dynamometer. Statistical analysis was performed using SPSS v25 and MINITAB.</span></p> <p><span>Results:</span><span> No significant force differences were found between Cerasmart and Vita Enamic. Both adhesive techniques (Self Etch and Total Etch) required similar forces. Among adhesive variants, [SiAd] showed less strength variation than [Si]. Fracture types showed no significant differences in mean strengths. The [T] technique had more adhesive and cohesive fractures, while the [S] technique had mainly adhesive and mixed fractures.</span></p> <p><span>Conclusion:</span><span> Using 3M Universal Single Bond Adhesive on Vita Enamic with Total Etch resulted in the highest strength (6.18 MPa). Cerasmart with Self Etch showed 5.67 MPa. Silane Monobond N performed well on both materials. Total Etch was most effective for Vita Enamic, while Self Etch showed better resistance in Cerasmart. Silane + Universal Adhesive had less variability than Silane alone. Cohesive fractures exerted the highest force, followed by adhesive and mixed fractures.</span></p>
MarTREC 6017: Development of Rapid Setting Soil-Cement Mixture Designs and Performance Testing
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Development of Geopolymer-Based Cement and Soil Stabilizers for Transportation Infrastructure
<p>Corresponding data set for Tran-SET Project No. 18CTAM03. Abstract of the final report is stated below for reference:</p> <p>"Geopolymer Cement (GPC) has drawn much attention in the recent years as an alternative to Ordinary Portland Cement (OPC) for soil stabilization, pavements, bridges and other transportation structures due to their good mechanical properties in comparison to OPC. In addition, GPC can be processed at room temperatures from aqueous solutions of waste materials (e.g. fly ash) or abundant natural sources (e.g. clay), thereby significantly reducing CO2 production associated with processing of OPC. As such, GPC proves to be a more sustainable and environmentally friendly alternative than OPC. This research explores methods to develop GPC with desired properties and evaluate their durability characteristics as part of their long-term performance based on real service conditions when exposed to significant water intake during flooding or torrential rainfall. Teams from Texas A&M University (TAMU) and University of Texas at Arlington (UTA) collaborated in this study to understand GPC, propose different methods to synthesize GPC, and to effectively synthesize a GPC composition."</p>
Holocene Analog of Ancient Marine Radiaxial Fibrous Calcite: Early Alteration of Marine Micritic Mg Calcite Cement
<p>Table S1</p> <p> </p>
Three-dimensional dataset of hydrating cement paste (CEM I Ladce, 391 m^2/kg Blaine, w/c=0.35) in TIFF format
<p>A detailed description of this dataset can be found in <a href="https://doi.org/10.1016/j.dib.2023.108903">https://doi.org/10.1016/j.dib.2023.108903.</a></p> <p>This dataset contains a collection of digitized three-dimensional hardened cement paste microstructures obtained from X-ray micro-computed tomography, screened after approx. 1, 2, 3, 4, 7, 14, and 28 days of elapsed hydration at 20˚C in saturated conditions. Each paste specimen had a cylindrical shape (with a diameter of ~1 mm) and was screened at a designated time (as specified in the file name, e.g. “t23hrs”=23 hours of elapsed hydration) and finally saved as an uncompressed and unprocessed *.tif greyscale image data file in 16-bit image depth (as unsigned integers) using a little-endian byte sequence.</p> <p>The dataset contains two sets of images:</p> <p>- “full-sized” digital images stored in a three-dimensional voxel-based matrix with a fixed size of 1100x1100x1100 voxels, denoted as “CEM_I_Ladce_*” in the file name; each file size amounts to ~2.5 GB and contains the whole screened specimen with a variable voxel size in the range 1.0913 − 1.1174 µm depending on the particular specimen (as specified in the file name, e.g. “1d1174um”=1.1174 µm/voxel)</p> <p>- smaller image subvolumes, denoted as Region Of Interest (ROI), extracted from the interior of the full-sized specimen from an arbitrary location, and denoted as “filteredROI_*” in the file name; this cropped ROI has a cubic shape and stores a three-dimensional voxel-based matrix with a fixed size of 500x500x500 µm<sup>3</sup> constituted by a variable voxel count (given the fluctuating voxel size for each specimen, see above). Both the exact voxel count (i.e. three-dimensional matrix dimensions) and voxel size are further specified in each file name. A sequence of imaging filters was sequentially applied to this ROI to further enhance the contrast among the different microstructural phases, see <a href="https://doi.org/10.1016/j.cemconcomp.2022.104798">10.1016/j.cemconcomp.2022.104798</a> for details.</p> <p>Note that the same dataset stored in *raw format is available from <a href="https://doi.org/10.5281/zenodo.7193501">https://doi.org/10.5281/zenodo.7193501</a></p>
Enhancing concrete properties with microsilica and fly ash as cement replacements: an experimental study
<p>Enhancing concrete properties with microsilica and fly ash as cement replacements: an experimental study</p>
Data for "More intensive use and lifetime extension can enable net-zero emissions in China's cement cycle"
<p>Part of the data used and results in the paper "<em><strong>More intensive use and lifetime extension can enable net-zero emissions in China's cement cycle</strong></em>" published on the journal <em>Resources, Conservation, and Recycling</em>. </p>
Total Hip Replacement With the Answer® Hip Stem and Ranawat/Burnstein® Shell Using Simplex® or Palacos® Bone Cement
ClinicalTrials.gov study NCT00588861. IPD Sharing: Not stated. Countries: 1. Publications: 0.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.