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Incorporation of Clay into Natural Rubber (Hevea) for the Production of Tile Adhesive

Open Journal of Composite Materials 2022年第1期12卷 30-40页

作者： Durand Hermann Ohouo Conand Honoré Kouakou moro olivier boffoue Edjikémé Eméruwa Brahiman Traoré Soil Water and Geomaterials Laboratory (UFR-STRM) Felix Houphou&euml t-Boigny University Abidjan C&ocirc te d’Ivoire

Natural rubber latex is the white liquid in the form of the colloidal dispersion of rubber globules suspended in the aqueous liquid. Produced in large quantities in Ivory Coast, the local transformation of natural latex has so far remained insignificant, although some attempts have been made to use it in the manufacture of flexible facade briquettes for rounded walls. Thus, this study aims to incorporate clay as a filler in natural latex for use as an adhesive for tile installation. To do this, different proportions of clay paste were added to the natural latex and the resulting mixtures were used to make the sample and tile adhesive. From the analysis of the results obtained, it appears that the samples with a clay paste density of 0.8 and 1 absorb less water and shows good pull-out strength. The mixtures of 30% and 35% latex and 0.8 and 1 clay paste density respectively have pullout stresses greater than 1 N/mm2. According to NF EN 1348, these adhesives can therefore be used as tile adhesive.

关键词： Adhesive Mortar Rubber Latex Clay Tile Adhesion

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Effect of Sand Partial Substitution for Glass Powder on the Behaviour of Sand-Cement Mortar

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Materials Sciences and Applications 2019年第12期10卷 756-767页

作者： Séraphin Agré Djomo Conand Honoré Kouakou Koffi Clément Kouadio moro olivier boffoue Edjikémé Emeruwa Departement Sciences de la Terre UFR Environnement Universite Jean Lorougnon Guede Daloa Côte d’Ivoire Laboratoire de Géomatériaux et Technologie du Bâtiment (LGTB) UFR des Sciences de la Terre et des Ressources Minières Université Felix Houphouet Boigny de Cocody Abidjan Côte d’Ivoire

Partial substitution of aggregates for pieces of glass in concrete contributes to reducing the use this resource and preserving the environment for future generations. However, concretes or mortars mixed with crushed glass can deteriorate within a few years, because of the alkali-silica reaction related to the size of glass pieces. Some investigations were carried out in order to find out how to bring down this phenomenon. Different percentages of glass powder were mixed with mortar made from sand, cement and crushed glass pieces of which diameter is between 1 and 5 mm. Products obtained were submitted to flexural testing, compressive strength testing and resistance to acid attack and Scanning Electron microscopy (SEM) observations were made after a period running from 28 to 180 days of drying. The results show an increase in the mechanical properties of products with glass powder and an improvement in the durability of mortar in acidic environment. Such improvements are related to the enhanced adhesion created between crushed glass pieces and cementitious matrix containing glass powder as a result of pozzolanic reaction.

关键词： Pozzolanic Reaction Crushed Glass Glass Powder Alkali-Silica Reaction

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Near-infrared polarimetry of the GG Tauri A binary system

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Research in Astronomy and Astrophysics 2014年第11期14卷 1438-1446页

作者： Yoichi Itoh Yumiko Oasa Tomoyuki Kudo Nobuhiko Kusakabe Jun Hashimoto Lyu Abe Wolfgang Brandner Timothy D.Brandt Joseph C.Carson Sebastian Egner Markus Feldt Carol A.Grady olivier Guyon Yutaka Hayano Masahiko Hayashi Saeko S.Hayashi Thomas Henning Klaus W.Hodapp Miki Ishii Masanori Iye Markus Janson Ryo Kandori Gillian R.Knapp Masayuki Kuzuhara Jungmi Kwon Taro Matsuo Michael W.McElwain Shoken Miyama Jun-Ichi Morino Amaya moro-Martin Tetsuo Nishimura Tae-Soo Pyo Eugene Serabyn Takuya Suenaga Hiroshi Suto Ryuji Suzuki Yasuhiro H.Takahashi Naruhisa Takato Hiroshi Terada Christian Thalmann Daigo Tomono Edwin L.Turner Makoto Watanabe John Wisniewski Toru Yamada Satoshi Mayama Thayne Currie Hideki Takami Tomonori Usuda Motohide Tamura Nishi-Harima Astronomical Observatory Center for AstronomyUniversity of Hyogo407-2NishigaichiSayoHyogo 679-5313Japan Faculty of Education Saitama University255 Shimo-OkuboSakuraSaitamaSaitama338-8570Japan Subaru Telescope National Astronomical Observatory of Japan650 North Ahoku PlaceHiloHI 96720USA National Astronomical Observatory of Japan 2-21-1OsawaMitakaTokyo181-8588Japan H.L.Dodge Department of Physics & Astronomy University of Oklahoma440 W Brooks St.NormanOK 73019USA Laboratoire Lagrange (UMR 7293) Universit de Nice-Sophia AntipolisCNRSObservatoire de la Cote d’Azur28 avenue Valrose06108 Nice Cedex 2France Max Planck Institute for Astronomy Knigstuhl 1769117 HeidelbergGermany Department of Astrophysical Science Princeton UniversityPeyton HallIvy LanePrincetonNJ 08544USA Department of Physics and Astronomy College of Charleston58 Coming St.CharlestonSC29424USA Subaru Telescope National Astronomical Observatory of Japan650 North A’ohoku PlaceHiloHI 96720USA Exoplanets and Stellar Astrophysics Laboratory Code 667Goddard Space Flight CenterGreenbeltMD 20771USA Eureka Scientific 2452 DelmerSuite 100Oakland CA 96002USA Goddard Center for Astrobiology GreenbeltMD 20771USA Institute for Astronomy University of Hawaii640 N.Aohoku PlaceHiloHI 96720USA Department of Earth and Planetary Sciences Tokyo Institute of TechnologyOokayamaMeguro-kuTokyo 152-8551Japan Department of Astronomy Kyoto UniversityKitashirakawa-Oiwake-choSakyo-kuKyotoKyoto 606-8502Japan Hiroshima University 1-3-2KagamiyamaHigashihiroshimaHiroshima 739-8511Japan Department of Astrophysics CAB-CSIC/INTA28850 Torrejón de ArdozMadridSpain Jet Propulsion Laboratory California Institute of TechnologyPasadenaCA91109USA Department of Astronomical Science The Graduate University for Advanced Studies2-21-1OsawaMitakaTokyo181-8588Japan Department of Astronomy The University of Tokyo7-3-1HongoBunkyo-kuTokyo113-0033Japan Astronomical Institute "Anton Pannekoek" University

A high angular resolution near-infrared image that shows the intensity of polarization for the GG Tau A binary system was obtained with the Subaru Telescope. The image shows a circumbinary disk scattering the light from the central binary. The azimuthal profile of the intensity of polarization for the circumbinary disk is roughly reproduced by a simple disk model with the Henyey-Greenstein phase function and the Rayleigh function, indicating there are small dust grains at the surface of the disk. Combined with a previous observation of the circumbinary disk, our image indicates that the gap structure in the circumbinary disk orbits counterclockwise, but material in the disk orbits clockwise. We propose that there is a shadow caused by material located between the central binary and the circumbinary disk. The separations and position angles of the stellar components of the binary in the past 20 yr are consistent with the binary orbit with a = 33.4 AU and e = 0.34.

关键词： stars individual (GG Tauri) -- stars pre-maln sequence - techniques high angular resolution

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