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10 results for “Portland cement”
Raw data for: Portland and Belite cement hydration acceleration by C-S-H seeds with variable w/c ratios
<p>Raw data for: "Portland and Belite cement hydration acceleration by C-S-H seeds with variable w/c ratios".</p> <p>Includes: Calorimetry, TA, LXRPD and MIP data.</p> <p> </p> <p>doi: <a href="https://doi.org/10.3390/ma15103553">https://doi.org/10.3390/ma15103553</a></p>
Dataset for "Influence of curing temperature on belite cement hydration: a comparative study with Portland cement" paper
<p>Dataset for paper (doi: <a title="Persistent link using digital object identifier" href="https://doi.org/10.1016/j.cemconres.2021.106499" target="_blank" rel="noreferrer noopener"><span>https://doi.org/10.1016/j.cemconres.2021.106499</span></a>) with the abstract "Belite cements (BCs) could be a more sustainable binder than Portland cements (PCs) but adequate knowledge of the hydration features has still to be built. In particular, the mild curing hydration temperature effects have been extensively studied for PCs but not for BCs. This research was triggered by a previous work reporting improved mechanical strengths of BCs at higher curing temperatures. Here, we report the hydration characteristics of a BC at 20, 40 and 60ºC and compared to those of a typical PC. We have corroborated previous findings and used a multi-technique approach including Rietveld phase analysis, thermal analysis, calorimetry, silicon MAS-NMR, mercury intrusion porosimetry and chiefly synchrotron X-ray microtomography, to thoroughly understand the different behavior. In a nutshell, the improved mechanical performances at mild curing temperatures for BCs are due to a much larger belite degree of reaction without a significant porosity coarsening."</p>
Ptychographic X-ray computed tomography data for three Portland cement pastes
<p>Mortars and concretes are ubiquitous materials with very complex hierarchical microstructures. To fully understand their main properties and to decrease their CO<sub>2</sub> footprints, a sound description of their (spatially-resolved) mineralogy is compulsory. Developing this knowledge is very challenging as about half of the volume of hydrated cement is a nanocrystalline component, calcium-silicate-hydrate (C-S-H gel). Furthermore, other poorly crystalline phases (e.g. iron-siliceous hydrogarnet or silica oxide) may coexist which are even more difficult to characterise. Traditional spatially-resolved techniques like electron microscopies involve complex sample preparation steps that often lead to artefacts (e.g. dehydration and microstructural changes). Here, we have used synchrotron ptychographic tomography for obtaining spatially-resolved information on three unaltered representative samples: neat Portland paste, Portland-calcite and Portland-fly ash blend pastes with spatial resolution below 100 nm in samples of up to 5×10<sup>4</sup> mm<sup>3</sup> of volume. For the neat Portland paste, the ptychotomographic study gave densities of 2.11 and 2.52 gcm<sup>-3</sup> and contents of 41.1 and 6.4 vol% for nanocrystalline C-S-H gel and poorly crystalline iron-siliceous hydrogarnet, respectively. Furthermore, the spatially-resolved volumetric mass density information has allowed to characterise inner product and outer product C-S-H gels. The average density of inner product C-S-H is smaller than that of outer product and its variability larger. Full characterisation of the pastes, including segmentation of the different components, is reported and the contents are compared with the results obtained by thermodynamical modelling.</p> <p> </p> <p> </p> <p> </p> <p>Ptychographic X-ray computed tomography provides 3D electron mass density and attenuation coefficient distributions of unaltered cement pastes with an isotropic resolution below 100 nm. This imaging technique allows quantitatively distinguishing between different components with very similar absorption contrast.</p> <p>Samples were measured at the cSAXS beamline: i) a neat Portland Cement (PC); ii) a PC-CC blend: 80 wt% of PC and 20 wt% of CaCO<sub>3</sub>, and iii) a PC-FA blend: 70 wt% of PC and 30 wt% of fly ash. The main aim of this study is to have a better insight of the microstructure of the amorphous/nanocrystalline gels with submicrometer spatial resolution. It is worth noting that it is possible to determine the gel mass density and water content within the attained 3D resolution (about 100 nm).</p> <p>Here, we focused on the spatial distribution of the different components and in the variation of the electron density values which are very related to the mass density values. Special attention is paid to the density values of the amorphous (or nanocrystalline) components. The electron and mass density values of the C-S-H gel for three pastes are thoroughly analyzed. The density values range from 2.05-2.10 g·cm<sup>-3</sup> for high density C-S-H gel for neat PC and PC-CC pastes to 1.80 g<sup>.</sup>cm<sup>-3</sup> for low density C-S-H gel in PC-FA paste. The density value of poorly crystalline iron-siliceous hydrogarnet component, r=2.52 g·cm<sup>-3</sup>, has also been determined.</p> <p>A summary of our ongoing research focused on the analyses of cement pastes by synchrotron PXCT is reported and discussed.</p> <p> </p> <p> </p> <p> </p> <p><strong>PC sample:</strong></p> <p>tomo_beta_S02536_to_S03341_Hann_freqscl_0.35_0xxx</p> <p>tomo_delta_S02536_to_S03341_Hann_freqscl_1.00_0xxx</p> <p> </p> <p><strong>PC-CC sample:</strong></p> <p>tomo_beta_S04692_to_S06001_Hann_freqscl_0.35_0xxx</p> <p>tomo_delta_S04692_to_S06001_Hann_freqscl_1.00_0xxx</p> <p> </p> <p><strong>PC-FA sample:</strong></p> <p>tomo_beta_S03351_to_S04661_Hann_freqscl_0.35_0xxx</p> <p>tomo_delta_S03351_to_S04661_Hann_freqscl_1.00_0xxx</p> <p> </p> <p> </p>
Lung Function and Airway Inflammation in Portland Cement Workers
ClinicalTrials.gov study NCT00455377. IPD Sharing: Not stated. Countries: 1. Publications: 1.
The Use of Portland Cement in Primary Anterior Teeth Pulpotomy.
ClinicalTrials.gov study NCT04634123. IPD Sharing: NO. Countries: 1. Publications: 5.
Comparing the Outcome of Pulpotomy Using Biodentine and Portland Cement in Mature Cases With Irreversible Pulpitis: Randomized Clinical Trial
ClinicalTrials.gov study NCT04573374. IPD Sharing: NO. Countries: 0. Publications: 3.
Applicability Clinic of Cement Portland Structural White in Endodontic Surgery
ClinicalTrials.gov study NCT02474615. IPD Sharing: Not stated. Countries: 0. Publications: 4.
Dataset for publication Eslam El-Seidy, Mehdi Chougan, Matteo Sambucci, Mazen J. Al-Kheetan, Marco Valente, Seyed Hamidreza Ghaffar. (2023). Lightweight alkali-activated materials and ordinary Portland cement composites using recycled polyvinyl chloride and waste glass aggregates to fully replace natural sand. Construction & Building Materials, doi: https://doi.org/10.1016/j.conbuildmat.2023.130399
Open the record for dataset details and reuse information.
Experimental Dataset of the Ions in Mine Water on Mechanical Strength and Microstructure of Portland Cement
<p>This version contains experimental data on tests with PO42.5 Portland cement mixed with mineral water containing sulfate, magnesium, and bicarbonate ions. The "Compressive Strength" section presents data on the compressive strength of cement mortar specimens (50 × 50 × 50 cm) under nine distinct experimental conditions at different curing ages (7, 28, 56, 90, and 120 days). The "XRD" section provides X-ray diffraction data of cement specimens at 28 and 90 days under five experimental conditions. The "SEM" section includes scanning electron microscopy images of cement samples at 28 days under the same five experimental conditions. The "TG-DTG" section illustrates the variations in TG and DTG values with temperature (T) for cement samples at 28 and 90 days.</p>
Ameliorative potential of combined application of poultry manure and Portland cement on the hydraulic and mechanical properties of a degraded paleustult of
<p>Data is linked to the article as reflected in the title stated above. Details of the article could be seen in Archives of Agronomy and Sil Science</p>
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