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Journal articles on the topic 'Porc – Fumier'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

BONNEAU, M., J. Y. DOURMAD, B. LEBRET, et al. "Evaluation globale des systèmes de production porcine et leur optimisation au niveau de l’exploitation." INRAE Productions Animales 21, no. 4 (2008): 367–86. http://dx.doi.org/10.20870/productions-animales.2008.21.4.3413.

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Cet article résume les apports du programme «Porcherie verte» dans l’évaluation globale intégrée des systèmes de production porcine, prenant en compte à différentes échelles les diverses dimensions pertinentes de la durabilité, au-delà des seuls impacts environnementaux. La comparaison multicritères de deux types de conduite d’élevage prend en compte l’ensemble des dimensions de la durabilité (environnement, société, économie) mais à une échelle restreinte à l’atelier d’élevage porcin. Comparativement aux animaux élevés sur caillebotis, les porcs élevés sur litière avec accès à une courette bé

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2

Ortega, José, María Esteban, Mark Williams, Isidro Sánchez, and Miguel Climent. "Short-Term Performance of Sustainable Silica Fume Mortars Exposed to Sulfate Attack." Sustainability 10, no. 7 (2018): 2517. http://dx.doi.org/10.3390/su10072517.

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Nowadays, the reuse of wastes is essential in order to reach a more sustainable environment. The cement production results in CO2 emissions which significantly contribute to anthropogenic greenhouse gas emissions. One way to reduce them is by partially replacing clinker by additions, such as silica fumes or other wastes. On the other hand, the pore structure of cementitious materials has a direct influence on their service properties. One of the most popular techniques for characterizing the microstructure of those materials is mercury intrusion porosimetry. In this work, this technique has be

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3

Ruiz-Cañas, María C., Laura M. Corredor, Henderson I. Quintero, Eduardo Manrique, and Arnold R. Romero Bohórquez. "Morphological and Structural Properties of Amino-Functionalized Fumed Nanosilica and Its Comparison with Nanoparticles Obtained by Modified Stöber Method." Molecules 25, no. 12 (2020): 2868. http://dx.doi.org/10.3390/molecules25122868.

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In industry, silica nanoparticles (NPs) are obtained by the fuming and the precipitation method. Fumed silica NPs are commonly used in the preparation of nanocomposites because they have an extremely low bulk density (160–190 kg/m3), large surface area (50–600 m2/g), and nonporous surface, which promotes strong physical contact between the NPs and the organic phase. Fumed silica has fewer silanol groups (Si–OH) on its surface than the silica prepared by the Stöber method. However, the number of –OH groups on the fumed silica surface can be increased by pretreating them with sodium hydroxide (N

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4

Scano, Alessandra, Federico Ebau, Valentina Cabras, Franca Sini, and Guido Ennas. "Alternative Silica Sources in the Synthesis of Ordered Mesoporous Silica." Journal of Nanoscience and Nanotechnology 21, no. 5 (2021): 2847–54. http://dx.doi.org/10.1166/jnn.2021.19059.

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In this work, the influence of the use of alternative inexpensive silica sources on the structural, morphological and textural properties of MCM-41 like mesoporous materials to be used for biomedical applications has been investigated. The Liquid Crystal Template Method has been used to prepare the ordered mesoporous structured materials according to a novel composition starting from fumed silica or granular silica gel as alternative silica sources. The obtained materials have been characterized by X-ray Powder Diffraction, Transmission and Scanning Electron Microscopy, and nitrogen sorption,

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5

Auguste Emmanuel, ISSALI, MPIKA Joseph, MOKOLO Jean Baptiste, and ATTIBAYEBA P. "Response of Cucurbitaceae seedlings, Cucurbita mochata, Cucurbita pepo and Lagenaria siceraria to the fertilization by pig dejecta at Brazzaville, Congo." Journal of Applied Biosciences 150 (June 30, 2020): 15469–76. http://dx.doi.org/10.35759/jabs.150.7.

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Objective: To assess the main effects of three “Species” of Cucurbitaceae and two “Status” of their seedlings, individually taken, their interactions related to three variables measured on stem, three variables measured on leaf and one variable measured on flower were tested. Methodology and Results: Cucurbita moschata, Cucurbita pepo and Lagenaria siceraria were used as genotypes. They were planted according to a completely random block arrangement. Growth variables were measured on the stem, leaf and flower. The General Linear Model combining the comparison of means according to the Student

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6

Leboda, R., V. M. Gun'ko, M. Marciniak, W. Grzegorczyk, and J. Skubiszewska-Zięba. "Effect of Carbon Deposits on the Structure of Hybrid C/TiO2/SiO2 Adsorbents." Adsorption Science & Technology 19, no. 5 (2001): 385–95. http://dx.doi.org/10.1260/0263617011494259.

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The structural characteristics of pyrocarbon/X (X = fumed silica, mesoporous silica gel, fumed titania/silica, CVD-TiO2/fumed silica, CVD-TiO2/silica gel) prepared using several precursors [CH2Cl2, cyclohexene and TiO(AcAc)2, where Ac = acetylacetonate] were studied using the nitrogen adsorption/desorption method and an improved technique to allow the calculation of pore size distributions applying regularization procedures. Various pore models were used for the carbon phase. The pyrocarbon structure and distribution on the TiO2/SiO2 supports depends primarily on the structural features of the

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7

Mohammad, Iqbal Khan. "Microstructure of High Strength Concrete Mercury Intrusion Porosimetry and Thermogravimetry Analysis." Advanced Materials Research 243-249 (May 2011): 3781–86. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.3781.

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Microstructural properties such as pore structure and hydration play a decisive role in determining the properties of a concrete. This paper presents the investigation on pore structure and hydration process of high strength concrete. Pore structure study was conducted using mercury intrusion porosimetry and hydration progress was monitored using thermogravimetry analysis on various blended combinations of cementitious materials incorporating fly ash and silica fume as partial cement replacement. It was found that silica fume refined the pore structure efficiently and reduced the calcium hydro

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8

Crețu, Andrea, Carlos Mattea, Siegfried Stapf, and Ioan Ardelean. "The Effect of Silica Fume and Organosilane Addition on the Porosity of Cement Paste." Molecules 25, no. 8 (2020): 1762. http://dx.doi.org/10.3390/molecules25081762.

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The present work systematically investigates the influence of silica fume and organosilane addition on the hydration dynamics and the capillary pore formation of a cement paste. The cement samples were prepared with two water-to-cement ratios with increasing amounts of silica fume and of (3-Aminopropyl)triethoxysilane (APTES) organosilane. Low-field 1H nuclear magnetic resonance (NMR) relaxation measurements were performed during the hydration of the samples and after hydration, in order to reveal the dynamics of water molecules and the pore distribution. Increasing concentrations of silica fu

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9

Lee, Chinlai, Maochieh Chi, and Ran Huang. "Quantitative evaluation of mineral admixtures on the properties, pore structure, and durability of cement-based composites." Science and Engineering of Composite Materials 19, no. 2 (2012): 199–207. http://dx.doi.org/10.1515/secm-2011-0127.

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AbstractThe influence of water/cementitious material ratio, silica fume, and fly ash as partial Portland cement replacement materials on the properties, pore structure, and durability of cement-based composites was evaluated by conducting compressive strength test, mercury intrusion porosimetry test, water absorption, rapid chloride penetration test, and scanning electron microscopy (SEM). Water/cementitious material ratio, and replacement percentage of silica fume and fly ash have significant effects on the pore structure and durability of cement-based composites. Composites with silica fume

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10

Yang, S., M. Oostrom, M. J. Truex, G. Li, and L. Zhong. "Injectable silica–permanganate gel as a slow-release MnO4− source for groundwater remediation: rheological properties and release dynamics." Environmental Science: Processes & Impacts 18, no. 2 (2016): 256–64. http://dx.doi.org/10.1039/c5em00559k.

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A mixture of aqueous KMnO<sub>4</sub> solution and fumed silica powders produces a gel that slowly releases a MnO<sub>4</sub><sup>−</sup> oxidant which enhances the removal of chlorinated contaminants from pore water in aquifers.

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11

Li, Ming Ming, Wen Jie Zhu, Wen Hui Ma, Yang Zhou, and Ke Qiang Xie. "Synthesis of High-Quality MCM-41 Using Silica Fume as Silica Source." Advanced Materials Research 734-737 (August 2013): 2536–40. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.2536.

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The high-quality MCM-41 was synthesized from silica fume with Citric acid and cetyltrimethylammonium bromide (CTAB) as template agents. Silica fume entered into liquid system in silicate and matched with CTA+. Mesoporous phase formed with the help of Citric and PEG-6000 in an acidic process followed. The structure and morphology of mesoporous silica material so-prepared was investigated based on the analysis of X-ray diffraction (XRD), N2sorption/desorption (BET) and transmission electron microscopy (TEM). The results indicated that MCM-41 was successfully prepared by substituting silica fume

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12

Shen, Ye Qing, and Min Deng. "Application of Capillary Absorption on Characterization of Structure of Cement Compacts Containing Micro Silica Fume." Advanced Materials Research 250-253 (May 2011): 614–17. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.614.

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Effect of packed structure on behavior of capillary absorption was briefly reviewed. Silica fume blended cement was pressed at pressure of 18MPa in a special mould to prepare packed structure. Structure of blended cement compacts was characterized by method of capillary ethanol absorption. Results show that linear correlation coefficient between absorption weight and square root of absorption time for each compact is more than 0.999. Micro silica fume is randomly filled into the skeleton of the compact. With increase of silica fume addition, porosity of the compacts and total length of average

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13

Jin, Zu Quan, Peng Zhang, Tie Jun Zhao, and Bao Rong Hou. "Study on Ultra-Strength Mortar Prepared with Mineral Admixture." Materials Science Forum 675-677 (February 2011): 1073–76. http://dx.doi.org/10.4028/www.scientific.net/msf.675-677.1073.

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In this paper, preparation, property study of ultra-strength mortars with mineral admixture and clear river sand was carried out. The mineral admixture include fly ash, ultra-fine GGBS and silica fume. The experimental results show that the compressive strength of mortar improves with increasing amount of silica fume or ultra-fine GGBS. When the content of silica fume or ultra-fine GGBS is 30~35%, the compressive strength and flexural strength of mortar in curing age of 7 days are 100 MPa and 20MPa, respectively. But strength of mortar decreases with the increase replacement rate of fly ash. W

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14

Zulapriansyah, Rizki, Reni Suryanita, and Harnedi Maizir. "Komposisi Optimal Campuran Bata Ringan Silica Fume Berdasarkan Kuat Tekan." Sainstek (e-Journal) 8, no. 2 (2020): 49–55. http://dx.doi.org/10.35583/js.v8i2.119.

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Bata ringan seluler adalah bata ringan berpori dimana pembentukan pori dilakukan secara mekanika melalui penambahan senyawa pembusa (foaming agent). Jumlah pori yang banyak dan juga besar pada bata ringan seluler membatasi kekuatan dari bata ringan tersebut. Silica fume adalah bahan pengganti semen yang mampu meningkatkan nilai kuat tekan beton karena meningkatkan daya ikat antar agregat. Penelitian ini bertujuan mengkaji komposisi optimal campuran bata ringan seluler dengan silica fume berdasarkan nilai kuat tekan. Pengujian pada bata ringan meliputi uji kuat tekan pada umur 3, 7, 14, 21 dan

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15

Fujino, Shigeru, and Hiroshi Ikeda. "Room Temperature Imprint Using Crack-Free Monolithic SiO2-PVA Nanocomposite for Fabricating Microhole Array on Silica Glass." Journal of Nanomaterials 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/584320.

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This paper aims to fabricate microhole arrays onto a silica glass via a room temperature imprint and subsequent sintering by using a monolithic SiO2-poly(vinyl alcohol) (PVA) nanocomposite as the silica glass precursor. The SiO2-PVA suspension was prepared from fumed silica particles and PVA, followed by drying to obtain tailored SiO2-PVA nanocomposites. The dependence of particle size of the fumed silica particles on pore size of the nanocomposite was examined. Nanocomposites prepared from 7 nm silica particles possessed suitable mesopores, whereas the corresponding nanocomposites prepared fr

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16

Chen, Li Fang, Jesus López, Jin An Wang, et al. "Synthesis of Si-Based Mesoporous Materials with Different Structural Regularity." Advanced Materials Research 132 (August 2010): 38–44. http://dx.doi.org/10.4028/www.scientific.net/amr.132.38.

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Two types of mesoporous Si-MCM-41 materials were synthesized via a cationic surfactant template method using different Si-precursors. The materials obtained were characterized by FTIR, XRD, BET, TEM and 29Si MAS-NMR techniques. When fumed silica was used as Si precursor, a Si-MCM-41-I solid with wormhole-like pore topologies was obtained. However, when tetraethylorthosilicate (TEOS) was used as Si precursor, a mesoporous Si-MCM-41-II solid with hexagonal arranges and a long-range ordered structure could be obtained. These two kinds of mesoporous materials had a uniform pore size distribution w

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17

Neithalath, Narayanan, and Hieu T. Cam. "Strength and Transport Properties of Concretes Modified with Coarse Limestone Powder to Compensate for Dilution Effects." Transportation Research Record: Journal of the Transportation Research Board 2290, no. 1 (2012): 130–38. http://dx.doi.org/10.3141/2290-17.

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The use of a coarse limestone powder (median particle size of approximately 70 μm, five times larger than cement particles) as a cement replacement material results in a dilution effect. The magnitude of strength and transport property reduction is found to be greater than the magnitude of the cement replacement level. In this paper, methodologies to proportion concrete containing 10% to 15% of coarse limestone powder, in which the dilution effect is compensated through a combination of reduction in water-to-powder ratio and addition of 5% of silica fume, are discussed. Limestone–silica fume b

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18

Niu, Quan Lin, and Nai Qian Feng. "Evaluation of Concrete Permeability by Monitoring Alkali Saturated Conductivity of Concrete Incorporating Mineral Admixtures." Key Engineering Materials 405-406 (January 2009): 272–77. http://dx.doi.org/10.4028/www.scientific.net/kem.405-406.272.

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Concrete conductivity is the reflection of the micro pore structure and the pore solution conductivity of concrete, but the conductivity of pore solution changes considerably as different mineral admixtures are added, though the change is not always relevant to permeability and Cl- diffusivity. Saturation of concrete capillary pore system with 1 mol/l KOH solution through vacuum processing was tempted to maintain the pore solution conductivity constant, after which the concrete conductivity was a reflection of concrete porosity and tortuousity that closely related to Cl- diffusivity. Charge pa

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19

Kwon, Yang-Hee, Sung-Hoon Kang, Sung-Gul Hong, and Juhyuk Moon. "Enhancement of Material Properties of Lime-Activated Slag Mortar from Intensified Pozzolanic Reaction and Pore Filling Effect." Sustainability 10, no. 11 (2018): 4290. http://dx.doi.org/10.3390/su10114290.

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To utilize alkali-activated materials widely, this study investigates the effects of an intensified pozzolanic reaction and pore filling by silica fume on various material properties of lime-activated slag mortar. Although ground-granulated blast-furnace slag is classified as a cementitious material, it commonly requires an activator to enhance the performance of structural materials. In the first step of the improvement strategy, slag reaction is activated by hydrated lime. Next, silica fume is added to densify the microstructure by the physical pore filling effect and/or the pozzolanic react

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20

Argiz, C., E. Reyes, and A. Moragues. "Ultrafine portland cement performance." Materiales de Construcción 68, no. 330 (2018): 157. http://dx.doi.org/10.3989/mc.2018.03317.

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By mixing several binder materials and additions with different degrees of fineness, the packing density of the final product may be improved. In this work, ultrafine cement and silica fume mixes were studied to optimize the properties of cement-based materials. This research was performed in mortars made of two types of cement (ultrafine Portland cement and common Portland cement) and two types of silica fume with different particle-size distributions. Two Portland cement replacement ratios of 4% and 10% of silica fume were selected and added by means of a mechanical blending method. The resu

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21

Lilkov, V., I. Rostovsky, and O. Petrov. "Physical and mechanical characteristics of cement mortars and concretes with addition of clinoptilolite from Beli Plast deposit (Bulgaria), silica fume and fly ash." Clay Minerals 46, no. 2 (2011): 213–23. http://dx.doi.org/10.1180/claymin.2011.046.2.213.

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AbstractCement mortars and concretes incorporating clinoptilolite, silica fume and fly ash were investigated for changes in their physical and mechanical properties. It was found that additions of 10% clinoptilolite and 10% Pozzolite (1:1 mixture of silica fume and fly ash) were optimal for improvement of the quality of the hardened products, giving 8% and 13% increases in flexural and compressive strength respectively. The specific pore volume of the mortars incorporating zeolite decreased between the 28th and 180th day to levels below the values for the control composition due to the fact th

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22

Yang, Dao Yuan, and Guang Hui Wei. "Research the Performance of Alumina Insulation Material by Freeze-Drying." Key Engineering Materials 512-515 (June 2012): 527–30. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.527.

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The traditional method of preparation alumina insulation material includes the addition of pore-forming agent, direct foaming, foam impregnation and gel-casting. In this experiment, α-alumina as raw material, silica fume as an additive, Combination freeze-drying method, add pore-forming agent and direct foaming successfully prepared low-density, high strength, low thermal conductivity of alumina insulation material. Change the particle size of pore-forming agent can be get different properties of the sample. The SEM photograph was clearly observed that the hole wall dense uniform, α-alumina pa

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23

Flores-Leal, M. "Primed low frequency transcranial magnetic stimulation effects on smoking cue-induced craving." Revista Mexicana de Ingeniería Biomédica 37, no. 1 (2016): 17–26. http://dx.doi.org/10.17488/rmib.37.1.3.

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24

Deraz, Nasr-Allah M., Mohamed Heikal, and Hamdy El-Didamony. "Effect of Various Superplasticizers on the Textural Properties of Silica Fume Pozzolanic Cements." Adsorption Science & Technology 20, no. 5 (2002): 453–66. http://dx.doi.org/10.1260/026361702320644743.

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The influence of different superplasticizers on the hydration and textural characteristics of hardened pozzolanic cement pastes was evaluated. Thus, the BET surface areas and pore structures of hardened cement pastes containing different amounts of silica fume and/or various superplasticizers were determined via nitrogen adsorption isotherms measured at −196°C. Three types of superplasticizers were used in this study, viz. naphthalene formaldehyde sulphonate (NFS), sodium gluconate (SG) and their mixtures (NFS + SG). The various phase compositions and microstructures were assessed by X-ray dif

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25

Subagiono, Yon, Harnedi Maizir, and Reni Suryanita. "Perilaku Mekanik Bata Ringan Dengan Penambahan Silica Fume." Jurnal Rekayasa Sipil (JRS-Unand) 16, no. 3 (2020): 194. http://dx.doi.org/10.25077/jrs.16.3.194-204.2020.

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Bata beton ringan memiliki keuntungan praktis dan ekonomis dalam pelaksanaan kontruksi sehingga permintaan pasar untuk bata ringan semakin meningkat selama beberapa tahun terakhir. Selain itu pemakaian bata beton konvensional sebagai bahan bagunan non-struktural dinilai masih cukup besar massa jenisnya sehingga memberikan beban lebih ke struktur bangunan. Untuk itu diperlukan bata beton yang memiliki bobot yang lebih ringan sehingga dapat meningkatkan efisiensi baik bahan dan beban yang ditahan struktur maupun pondasi dari bangunan. Penggunaan bata ringan pada umumnya sebagai non struktur beru

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26

Doleželová, Magdaléna, Jitka Krejsová, Lenka Scheinherrová, Petr Svora, and Alena Vimmrová. "Microstructure and Pore Systems Development of Ternary Gypsum-Based Mortars." Key Engineering Materials 760 (January 2018): 67–72. http://dx.doi.org/10.4028/www.scientific.net/kem.760.67.

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Paper deals with ternary gypsum-based mortars with higher resistance against water, prepared from gypsum, hydrated lime, several pozzolans (crushed ceramic, silica fume, granulated blast slag) and sand. The samples were stored in the water and the pore systems development in time was studied by mercury intrusion porosimetry. The change of pore structure in samples with pozzolans were observed, the size of pores shifted to the smaller pores during tested period. The elementary composition and microstructure of all materials were also studied by scanning electron microscopy (SEM).

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27

Bahman, Mona, Maryam AlNahyan, Ibrahim Mustafa, and Faisal AlMarzooqi. "Effect of Pore Characteristics in Polyvinylidene Fluoride/Fumed Silica Membranes on Mass Flux in Solar-Assisted Evaporation Applications." Applied Sciences 9, no. 15 (2019): 3186. http://dx.doi.org/10.3390/app9153186.

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Although important, very little has been demonstrated in the literature to experimentally demonstrate the effects of porosities and pore size on the evaporation flux in polymeric membranes. Additionally, we suspect that a batch-mode setup, i.e., stagnant water, could cause a build-up of heat in the system, influencing the evaporation mass-flux mechanism, and jeopardizing the ability to attain a real correlation between evaporation and effects of pore characteristics. Herein, we fabricate polyvinylidene fluoride membranes containing variable amounts of a Fumed Silica additive to achieve membran

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Liao, Dongliang, Wen Shi, Jing Gao, Bin Deng, and Ruijin Yu. "Modified Camellia oleifera Shell Carbon with Enhanced Performance for the Adsorption of Cooking Fumes." Nanomaterials 11, no. 5 (2021): 1349. http://dx.doi.org/10.3390/nano11051349.

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Using Camellia oleifera shell (COS) as a raw material and phosphoric acid as the activator, activated Camellia oleifera shell carbon (COSC-0) was prepared and then modified by Fenton’s reagent (named as COSC-1). SEM, GC-MS, FTIR, and specific surface area and pore analyzers were used to study the adsorption performance of COS, COSC-0, and COSC-1 on cooking fumes. Results showed that COSC-1 was the best adsorbent compared with COS and COSC-0. The adsorption quantity and penetrating time of COSC-1 were 44.04 mg/g and 4.1 h, respectively. Most aldehydes could be adsorbed by COSC-1, which was due

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Yoon, Seyoon, and Inhwan Park. "Micropore Structures in Cenosphere-Containing Cementitious Materials Using Micro-CT." Advances in Materials Science and Engineering 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/3892683.

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Cenospheres have been recently applied to increase the volume of uniform micropores in hardened cementitious materials. Therefore, application of micro-CT to cenosphere-containing binders will help better understand the micropores formed by cenospheres in the hardened materials. Accordingly, the present study prepared Portland cement paste, alkali-activated fly ash/silica fume, and alkali-activated fly ash with 60% weight replacement by cenospheres and reconstructed their micropore structures using micro-CT. From the pore structure, individual micropores were extracted and analyzed using the p

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Li, Wei, Zhen Huang, Xiao Chu Wang, and Jun Wei Wang. "Experimental Study on Comparison about the Modifiers of Rubber Cement Concrete." Applied Mechanics and Materials 670-671 (October 2014): 387–90. http://dx.doi.org/10.4028/www.scientific.net/amm.670-671.387.

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5-8 mesh rubber granules was mixed with an equal volume instead of fine aggregate, and the content of rubber was 5%, 10%, 15% and 20%. Compared with the influence of silane coupling agent, latex and silica fume to the mechanical properties of rubber concrete, it studied the mechanism of rubber-modified to the rubber concrete. The test results proved that the silane coupling agent, latex, and silica fume could improve the compressive strength, splitting and flexural strength. Latex could significantly improve the bond strength of cement-based materials and the integrity of the concrete. Couplin

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Myronyuk, I. F., V. O. Kotsyubynsky, T. V. Dmytrotsa, L. M. Soltys, and V. M. Gun’ko. "Atomic Structure and Morphology of Fumed Silica." Physics and Chemistry of Solid State 21, no. 2 (2020): 325–31. http://dx.doi.org/10.15330/pcss.21.2.325-331.

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The comparative analysis of atomic structure and morphology of fumed silica nanoparticles prepared under different synthesis conditions are studied using TEM, FTIR, quantum chemistry, and low-temperature nitrogen adsorption methods. It was determined that the structure of amorphous silica nanoparticles is formed by branched chain-like clusters of the length of 0.6-2.4 nm that correspond to proto-particles or nuclei of nanoparticles. A linear part of the smallest clusters is consisted of two tetrahedra SiO4 with common oxygen atom and oppositely directed vertices. The inter-tetrahedral average

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Protsak, Iryna, Volodymyr M. Gun’ko, Volodymyr V. Turov, et al. "Nanostructured Polymethylsiloxane/Fumed Silica Blends." Materials 12, no. 15 (2019): 2409. http://dx.doi.org/10.3390/ma12152409.

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Polymethylsiloxane (PMS) and fumed silica, alone and in a blended form (1:1 w/w), differently pretreated, hydrated, and treated again, were studied using TEM and SEM, nitrogen adsorption–desorption, 1H MAS and 29Si CP/MAS NMR spectroscopy, infrared spectroscopy, and methods of quantum chemistry. Analysis of the effects of adding water (0–0.5 g of water per gram of solids) to the blends while they are undergoing different mechanical treatment (stirring with weak (~1–2 kg/cm2) and strong (~20 kg/cm2) loading) show that both dry and wetted PMS (as a soft material) can be grafted onto a silica sur

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Shirani Lapari, Shima, Zainab Ramli, and Sugeng Triwahyono. "Effect of Different Templates on the Synthesis of Mesoporous Sodalite." Journal of Chemistry 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/272613.

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Sodalite is a type of zeolite having ultramicropore size and high thermal stability with strong basic sites. However, sodalite has several drawbacks in the catalyst application due to its smallest pore size (2.8 Å) and low surface area. To overcome these disadvantages, microporous sodalite can be modified to have mesoporous structure but maintain its active sites suitable for catalyst applications. This study was focused on the synthesis of mesoporous sodalite using various organic templates as structure directing molecules. A hierarchical mesoporous sodalite has been synthesized hydrothermall

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Zhan, Bing Gen, Quan Wang, Wan Liang Zhou, and Hong Yu Sheng. "Mechanism of Silica Fume in Suppressing Alkali-Silica Reaction of Concrete：Interfacial Transition Zone Concerns." Advanced Materials Research 450-451 (January 2012): 676–82. http://dx.doi.org/10.4028/www.scientific.net/amr.450-451.676.

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The composition and structure of the interfacial transition zone (ITZ) in concrete were investigated to analyze the mechanism of silica fume in suppressing alkali-silica reaction (ASR). Alkali active concrete specimens with varying addition of silica fume were prepared for the experiment. Changes of compositions and pore structures at ITZ and the elements distribution across ITZ were analyzed by SEM and SEM-BSE. The expansion of the corresponding mortar bar was also measured. The results show that the accumulation of element of alkali metal occurred at ITZ in alkali active concrete without sil

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Torii, Kazuyuki, and Mitsunori Kawamura. "Pore structure and chloride ion permeability of mortars containing silica fume." Cement and Concrete Composites 16, no. 4 (1994): 279–86. http://dx.doi.org/10.1016/0958-9465(94)90040-x.

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Zheng, Xiu Hua, Shu Jie Song, and Yong Quan Zhang. "Permeability of Lightweight Aggregate Concrete with Mineral Admixture." Advanced Materials Research 857 (December 2013): 105–9. http://dx.doi.org/10.4028/www.scientific.net/amr.857.105.

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This paper presents an experimental study on the permeability and the pore structure of lightweight concrete with fly ash, zeolite powder, or silica fume, in comparison to that of normal weight aggregate concrete. The results showed that the mineral admixtures can improve the anti-permeability performance of lightweight aggregate concrete, and mixed with compound mineral admixtures further more. The resistance to chloride-ion permeability of light weight concrete was higher than that of At the same strength grade, the anti-permeability performance of lightweight aggregate concrete is better th

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Xu, Linglin, Siyu Liu, Peiming Wang, and Zhenghong Yang. "Influence of Mineral Additives on the Efflorescence of Ettringite-Rich Systems." Materials 14, no. 18 (2021): 5464. http://dx.doi.org/10.3390/ma14185464.

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Efflorescence is aesthetically undesirable to all cementitious materials products and mainly results from the carbonation of hydrates and salt precipitation. Alternative binders without portlandite formation theoretically have much lower efflorescence risk, but in practice, the efflorescence of ettringite-rich systems is still serious. This study reports the impacts of mineral additives on the efflorescence of ettringite-rich systems and the corresponding microstructural evolution. The effects of silica fume, limestone powder, and diatomite on efflorescence and the capillary pore structure of

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Ifka, Tomáš, Martin Palou, Marta Kuliffayova, Martin Boháč, Františka Frajkorová, and Lubomir Bagel. "Pore Structure Analysis of Portland Cement and Blended Portland Cements Cured under Hydrothermal Conditions." Advanced Materials Research 1000 (August 2014): 235–38. http://dx.doi.org/10.4028/www.scientific.net/amr.1000.235.

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The pore structure of Portland cement pastes cured under different hydrothermal regimes was analyzed. Pore size distribution (PSD), hydraulic permeability coefficient (HK) and porosity (P) were found depending on temperature and steam pressure. With increasing hydrothermal characteristics, the pore structures degraded causing the depletion in compressive strength. Then, blast furnace slag (BFS) and silica fume (SF) were added to PC and cured under similar conditions. It was found that the pore structure was greatly improved. The effect of hydrothermal curing may be interpreted by the intensity

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Deng, Hongwei, Guanglin Tian, Songtao Yu, Zhen Jiang, Zhiming Zhong, and Yanan Zhang. "Research on Strength Prediction Model of Sand-like Material Based on Nuclear Magnetic Resonance and Fractal Theory." Applied Sciences 10, no. 18 (2020): 6601. http://dx.doi.org/10.3390/app10186601.

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Micro-pore structure has a decisive effect on the physical and mechanical properties of porous materials. To further improve the composition of rock-like materials, the internal relationship between microscopic characteristics (porosity, pore size distribution) and macroscopic mechanical properties of materials needs to be studied. This study selects portland cement, quartz sand, silica fume, and water-reducing agent as raw materials to simulate sandstone. Based on the Nuclear magnetic resonance (NMR) theory and fractal theory, the study explores the internal relationship between pore structur

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Wang, Miao, Pengfei Lai, Yongzhe Li, Ping Yu, Zheng Wang, and Huilin Zhang. "Effect of silica fume-enhanced carbon nanotube dispersion on the strength and damping properties of cement composites." Materials Express 10, no. 9 (2020): 1412–22. http://dx.doi.org/10.1166/mex.2020.1765.

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Carbon nanotubes (CNTs) tend to agglomerate in cement paste, which impedes the effect of performance reinforcement. This paper applies silica fume as an active factor to enhance the dispersion of CNTs and investigates the influence of silica fume on the strength and damping properties of CNT-reinforced cement composites. Mechanical strength tests and dynamic mechanical analysis on specimens with different contents of CNTs (0%, 0.1% and 0.2%) and silica fume (0%, 5%, 10% and 15%) are conducted. The microstructure is characterized by Scanning Electron Microscopy (SEM), and the pore size distribu

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Chen, Yi, Wu Yao, and Dan Jin. "Shrinkage of Blended Cement Pastes with Mineral Additions." Key Engineering Materials 539 (January 2013): 55–59. http://dx.doi.org/10.4028/www.scientific.net/kem.539.55.

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Mineral additions such as fly ash and silica fume are industrial by products, and play an important role in properties improvement for construction materials. In this work, the shrinkage of cement paste blended with fly ash and silica fume by different substitute ratio was studied. Pore structures of specimens at different ages were determined by mercury intrusion porosimetry (MIP) and shrinkage deformation was measured by standard shrinkage tests. The effects of mineral addtions on shrinkage were discussed. The results show that the fly ash was significantly effective on shrinkage at early ag

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Zhang, Shengli, Yuqi Zhou, Jianwei Sun, and Fanghui Han. "Effect of Ultrafine Metakaolin on the Properties of Mortar and Concrete." Crystals 11, no. 6 (2021): 665. http://dx.doi.org/10.3390/cryst11060665.

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This study investigated the influence of ultrafine metakaolin replacing cement as a cementitious material on the properties of concrete and mortar. Two substitution levels of ultrafine metakaolin (9% and 15% by mass) were chosen. The reference samples were plain cement concrete sample and silica fume concrete sample with the same metakaolin substitution rates and superplasticizer contents. The results indicate that simultaneously adding ultrafine metakaolin and a certain amount of polycarboxylate superplasticizer can effectively ensure the workability of concrete. Additionally, the effect of a

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Kumar, Amitabha, and Della M. Roy. "Pore Structure Studies of High Early Strength Portland Cements Containing Silica Fume." Transactions of the Indian Ceramic Society 47, no. 1 (1988): 11–15. http://dx.doi.org/10.1080/0371750x.1988.10822874.

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Zarnaghi, Vahab Naderi, Ali Fouroghi-Asl, Vahid Nourani, and Hongyan Ma. "On the pore structures of lightweight self-compacting concrete containing silica fume." Construction and Building Materials 193 (December 2018): 557–64. http://dx.doi.org/10.1016/j.conbuildmat.2018.09.080.

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Larbi, J. A., A. L. A. Fraay, and J. M. J. M. Bijen. "The chemistry of the pore fluid of silica fume-blended cement systems." Cement and Concrete Research 20, no. 4 (1990): 506–16. http://dx.doi.org/10.1016/0008-8846(90)90095-f.

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Khalil, Kh A. "Pore structure and surface area of hardened cement pastes containing silica fume." Materials Letters 26, no. 4-5 (1996): 259–64. http://dx.doi.org/10.1016/0167-577x(95)00235-9.

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He, Jia Li, Xiu Hua Chen, Wen Jie Zhu, et al. "Synthesis of Mesoporous Silica Microspheres by PICA and Pseudomorphic Transformation Using Silica Fume as Silica Source." Materials Science Forum 809-810 (December 2014): 207–12. http://dx.doi.org/10.4028/www.scientific.net/msf.809-810.207.

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Monodisperse mesoporous silica microspheres (MSM-SF) were successfully prepared through PICA and pseudomorphic transformation using silica fume as original silica source. The structure and morphology of spheres were quantitatively investigated by Zata potential and particle size analyzer, N2 sorption isotherms, XRD, SEM and TEM. The results showed that the monodisperse spherical mesoporous silica microspheres (MSM-SF) exhibited uniform spherical morphology, worm-like mesoporous, large BET surface area of 559.9m2/g; its BJH average pore size diameter and total pore volume are 3.3nm and 0.12cm3/

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Peng, Yan Zhou, Kai Chen, and Shu Guang Hu. "Durability and Microstructure of Ultra-High Performance Concrete Having High Volume of Steel Slag Powder and Ultra-Fine Fly Ash." Advanced Materials Research 255-260 (May 2011): 452–56. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.452.

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The durability, such as chloride ion permeability, freeze-thaw and sulfate attack resistance of ultra-high performance concrete (UHPC) having a large amount, ranged from 42% to 48% by weight of binder, of mineral admixtures including steel slag powder (SS), ultrafine fly ash (UFFA) and silica fume (SF) was studied and the microstructure of selected UHPC compositions was investigated by Mercury porosimetry in this paper. Moreover, the relationship between durability and microstructure of UHPC was analyzed. The mercury porosimetry studies demonstrated the very low porosity and a high proportion

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Yun, S. H., C. W. Lee, Jai Sung Lee, C. W. Seo, and E. K. Lee. "Fabrication of SiO₂-Coated Magnetic Nanoparticles for Applications to Protein Separation and Purification." Materials Science Forum 449-452 (March 2004): 1033–36. http://dx.doi.org/10.4028/www.scientific.net/msf.449-452.1033.

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Coating of -Fe2O3 nanoparticles with SiO2 layer by wet chemical synthesis and its applications to protein separation and purification were investigated. The average particle size of -Fe2O3 core was 20 nm and SiO2 layer thickness was 5 nm. The band of OH- radicals on SiO2 layer was detected between 3600 and 3200 cm-1 in wave numbers, which showed that the surface property of coated nanoparticles was similar to that of conventional fumed silica. Finally, the feasibility of -Fe2O3/SiO2 nanoparticles for magnetic separation media in various bio processes was discussed in terms of structural and fu

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Saikrasoon, Anut, Sirithan Jiemsirilers, and Pitak Laoratanakul. "Influence of Alkaline Concentration on Physical Properties of Porous Geopolymer Using Silica Fume as Foaming Agent ." Key Engineering Materials 659 (August 2015): 106–10. http://dx.doi.org/10.4028/www.scientific.net/kem.659.106.

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Porous geopolymer could be synthesized by using metakaolin and silica fume as foaming agent. The foam morphology was estimated in the function of water, silica fume content, and curing temperatures. Raw materials were mixed by Hobart mixer for 5 minutes and then poured in to cylinder mold after that cured at 70 degree celsius for 24 hours. During the synthesis process, the complex reaction would occur such as polycondensation and oxidation. These reactions affect to chemical and physical properties of porous sample. The parameters that mention above affect to density, physical, and chemical pr

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