Search Results 1-20 of 130

  • Effect of light-curing time on light-cure/post-cure volumetric polymerization shrinkage and regional ultimate tensile strength at different depths of bulk-fill resin composites

    IDE Kurumi , NAKAJIMA Masatoshi , HAYASHI Juri , HOSAKA Keiichi , IKEDA Masaomi , SHIMADA Yasushi , FOXTON Richard M , SUMI Yasunori , TAGAMI Junji

    … <p>The aim of this study was to investigate volumetric polymerization shrinkage (VS), using swept-source optical coherence tomography (SS-OCT), of bulk-fill composites with different light-curing strategies; …

    Dental Materials Journal, 2019

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  • Effect of trifluoroethyl methacrylate comonomer on physical properties of Bis-GMA based dental composites

    TAY Jean-Sean , CHOONG Billy Bing Liang , OOI Ing Hong , TAN Bee Siew

    … <p>The purpose of this study was to investigate the effect of substituting triethyleneglycol dimethacrylate (TEGDMA) with 2,2,2-trifluoroethyl methacrylate (TFEMA) on water sorption, water solubility, degree of conversion, polymerization shrinkage, fluoride release and flexural strength of bisphenol-A-glycerolate dimethacrylate (Bis-GMA)/TEGDMA/urethane dimethacrylate (UDMA) dental composites. …

    Dental Materials Journal 38(2), 226-232, 2019

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  • EVALUATION OF LONG-TERM BEHAVIOR OF GRS INTEGRAL BRIDGE  [in Japanese]

    TAMAI Shinichi , TSUCHIYA Satoshi , TODOROKI Syuntaro , KOJIMA Kenichi , MAEKAWA Koichi

    補強盛土一体橋梁は,補強盛土と桁を剛結した形式の橋梁である.この橋梁は,橋梁本体と補強盛土が一体化していることによる優れた使用性や耐震性を有する一方,橋台壁および補強土が桁の変形を拘束するため不静定力の影響を受ける.特にコンクリート桁では収縮,クリープによる変形が長期に継続する可能性がある.<br> 本論文は,初めて実橋梁に適用された補強盛土一体橋梁を対象として,計測とマルチスケール解 …

    Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) 75(1), 34-43, 2019

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  • INFLUENCE ON PROPERTIES OF HIGH-STRENGTH CONCRETE BY THE CHANGE OF SAND-TOTAL AGGREGATE RATIO IN IDENTICAL WATER-CEMENT RATIO  [in Japanese]

    NAKATA Yoshihisa , SAITO Takeshi , KAJITA Hideyuki , OTSUKA Shuzo , HARUYAMA Nobuhito

    …  The authors have carried out experiments to identify the effects on fluidity, separation resistance, strength, Young's modulus, drying shrinkage and durability of high-strength concrete when sand-total aggregate ratio was varied. … In high-strength concrete while water-cement ratio and cement-paste volume was fixed, that is, volumetric ratios of coarse aggregate and fine aggregate were varied.<br> Three types of cement, normal portland cement, moderate-heat portland cement and low-heat portland cement, were used. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (748), 751-761, 2018-06

    J-STAGE  AIJ 

  • Mitigation of Drying and Carbonation Shrinkage of Cement Paste using Magnesia

    Ye Hailong

    … <p>In this work, the effect of magnesia (MgO) on the hydrated phase assemblage, microstructure, as well as drying and carbonation shrinkage of hardened Portland cement paste is studied. … The 5% MgO addition reduces the drying shrinkage of cement by about half, which cannot be simply explained by the molar volumetric increase due to MgO to brucite conversion. …

    Journal of Advanced Concrete Technology 16(9), 476-484, 2018

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  • Prediction of Shrinkage Cavity Occurring Position with Consideration of Volumetric Change during Solidification of Heavy Section Ductile Cast Iron  [in Japanese]

    Miyamoto Yutaka , Itofuji Haruki

    … In actual castings, shrinkage was not observed in the cross-section of the convex portion of 250 mm. … On the other hand, shrinkage cavities were observed in other convex parts. … The shrinkage occurred above the final coagulation position. … Moreover, shrinkage amount decreased as the height of the convex portion increased. … The analysis results showed that the method used in this study well suits the actual shrinkage tendency. …

    Journal of Japan Foundry Engineering Society 90(8), 450-456, 2018

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  • Assessment of cuspal deflection and volumetric shrinkage of different bulk fill composites using non-contact phase microscopy and micro-computed tomography

    PRAGER Martin , PIERCE Mark , ATRIA Pablo J. , SAMPAIO Camila , CÁCERES Eduardo , WOLFF Mark , GIANNINI Marcelo , HIRATA Ronaldo

    … <p>The understanding of cuspal deflection and volumetric shrinkage of resin composites is necessary to assess and improve the placement techniques of resin-based materials. … The aim of this study was to investigate the cuspal deflection and its relationship with volumetric polymerization shrinkage of different bulk-fill resin composites. …

    Dental Materials Journal 37(3), 393-399, 2018

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  • Volumetric Shrinkage Characteristics and Kinetics Analysis of Vanadium Titanomagnetite Carbon Composite Hot Briquette during Isothermal Reduction

    Zhao Wei , Chu Mansheng , Wang Hongtao , Liu Zhenggen , Tang Jue , Ying Ziwei

    … <p>The volumetric shrinking characteristics and kinetics of vanadium titanomagnetite carbon composite hot briquette (VTM-CCB) during isothermal reduction were investigated in this paper. … It was found that the volumetric shrinking occurs as a combination of a loss of carbon and oxygen from VTM-CCB as well as sintering of iron oxide, suppression of growth of iron whiskers, formation of molten phases, and residual solid carbon content. …

    ISIJ International 58(5), 823-832, 2018

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  • Micro-computed tomography evaluation of volumetric polymerization shrinkage and degree of conversion of composites cured by various light power outputs

    ATRIA Pablo J. , SAMPAIO Camila S. , CÁCERES Eduardo , FERNÁNDEZ Jessica , REIS Andre F. , GIANNINI Marcelo , COELHO Paulo G. , HIRATA Ronaldo

    … <p>This study evaluated the influence of different light-curing modes on the volumetric polymerization shrinkage and degree of conversion of a composite resin at different locations using micro-computed tomography and Fourier transform infrared spectroscopy (FTIR). … Different curing modes did not influence volumetric shrinkage neither degree of conversion of class I composite resin restorations.</p> …

    Dental Materials Journal 37(1), 33-39, 2018

    J-STAGE  Ichushi Web 

  • Assessment of cuspal deflection and volumetric shrinkage of different bulk fill composites using non-contact phase microscopy and micro-computed tomography

    PRAGER Martin , PIERCE Mark , ATRIA Pablo J. , SAMPAIO Camila , CÁCERES Eduardo , WOLFF Mark , GIANNINI Marcelo , HIRATA Ronaldo

    … <p>The understanding of cuspal deflection and volumetric shrinkage of resin composites is necessary to assess and improve the placement techniques of resin-based materials. … The aim of this study was to investigate the cuspal deflection and its relationship with volumetric polymerization shrinkage of different bulk-fill resin composites. …

    Dental Materials Journal, 2018

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  • INFLUENCE ON THE PROPERTIES OF HIGH-STRENGTH CONCRETE BY THE CHANGE OF UNIT WATER AT FIXED BULK VOLUME OF COARSE AGGREGATE  [in Japanese]

    NAKATA Yoshihisa , SAITO Takeshi , KAJITA Hideyuki , OTSUKA Shuzo , HARUYAMA Nobuhito

    …  The authors have carried out the experiments to identify the effects on fluidity, resistance to segregation, strength, Young's modulus, dry shrinkage and durability of high-strength concrete when unit water content was varied in high-strength concrete while unit bulk volume of coarse aggregate was fixed, or the volumetric ratios of cement paste and fine aggregate were varied.<br> Three types of cement, ordinary Portland cement, moderate-heat Portland cement and low-heat Portland cement, were used. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (738), 1145-1154, 2017-08

    J-STAGE  AIJ 

  • Effect of Alkalis on Cementitious Materials:Understanding the Relationship between Composition, Structure, and Volume Change Mechanism

    Ye Hailong , Radlińska Aleksandra

    … <p>Previous studies demonstrated that alkalis can considerably affect the volumetric properties of hardened cementitious binders, including shrinkage, creep, and micro-cracking. … In addition, new experimental results regarding the influence of lithium on shrinkage and micro-cracking of alkali-activated blast-furnace slag are discussed. …

    Journal of Advanced Concrete Technology 15(4), 165-177, 2017

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  • Use of Digital Image Analysis as a Monitoring Tool for Non-Uniform Deformation of Shrinkable Materials during Drying

    Jinorose Maturada , Stienkijumpai Anyanun , Devahastin Sakamon

    … Generally, deformation is evaluated and reported in terms of volumetric shrinkage. … However, volumetric shrinkage cannot be used to describe non-uniform deformation, which commonly takes place during drying of shrinkable materials such as biopolymers, fruits and vegetables. …

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 50(10), 785-791, 2017

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  • Depth of cure, flexural properties and volumetric shrinkage of low and high viscosity bulk-fill giomers and resin composites

    TSUJIMOTO Akimasa , BARKMEIER Wayne W. , TAKAMIZAWA Toshiki , LATTA Mark A. , MIYAZAKI Masashi

    … <p>The purpose of this study was to investigate the depth of cure, flexural properties and volumetric shrinkage of low and high viscosity bulk-fill giomers and resin composites. … Depth of cure and flexural properties were determined according to ISO 4049, and volumetric shrinkage was measured using a dilatometer. …

    Dental Materials Journal 36(2), 205-213, 2017

    J-STAGE  Ichushi Web 

  • MEASUREMENT OF THE THERMOPHYSICAL PROPERTIES OF TSUCHIKABE (WITH WATTLES AND NOGS EMBEDDED) CONSTRUCTED WITH TRADITIONAL SKILLS  [in Japanese]

    YOKOBAYASHI Shuzo , SATO Manami

    … This spacing is smaller than that of the standard building procedure.<br> The authors confirmed the occurrence of dry shrinkage of tsuchikabe as reported in this paper. … The volumetric shrinkage (average) under the steady state (air dry condition) is 4.7% for Specimen A and 5.5% for Specimen B. … Plasterers generally estimate dry shrinkage of tsuchikabe prior to building one. …

    Journal of Environmental Engineering (Transactions of AIJ) 82(732), 157-163, 2017

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  • Mechanical properties, volumetric shrinkage and depth of cure of short fiber-reinforced resin composite

    TSUJIMOTO Akimasa , BARKMEIER Wayne W. , TAKAMIZAWA Toshiki , LATTA Mark A. , MIYAZAKI Masashi

    … The mechanical properties, volumetric shrinkage and depth of cure of a short fiber-reinforced resin composite (SFRC) were investigated in this study and compared to both a bulk fill resin composite (BFRC) and conventional glass/ceramic-filled resin composite (CGRC). … Fracture toughness, flexural properties, volumetric shrinkage and depth of cure of the SFRC, BFRC and CGRC were measured. …

    Dental Materials Journal 35(3), 418-424, 2016

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  • Shear Strength of Reinforced Concrete Beams: Concrete Volumetric Change Effects

    Nakarai Kenichiro , Morito Shigemitsu , Ehara Masaki , Matsushita Shota

    Volumetric changes in concrete may affect the structural performance of reinforced concrete structures and their durability. … It has been revealed that autogenous shrinkage of high-strength concrete decreases reinforced concrete beam's shear strength compared with low-shrinkage concrete. … High-drying shrinkage of concrete may also decrease the shear strength of reinforced concrete beams using normal-strength concrete. …

    Journal of Advanced Concrete Technology 14(5), 229-244, 2016

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  • FRACTAL DIMENSION ANALYSIS FOR DRY SHRINKAGE CRACKING PATTERNS ON BENTONITE PASTES  [in Japanese]

    HIROSE Kosaburo , MATSUBARA Hitoshi , HARA Hisao

    マッドペーストの乾燥収縮亀裂は,土粒子と乾燥-湿潤サイクルの相互作用やペーストの状態変化に伴って,極めて複雑な力学的挙動を示すことが知られている.本研究では,ベントナイトペーストに発生するMudcrackのフラクタル次元を明らかにし,また,乾燥過程におけるフラクタル次元の経時変化および粒度組成に伴う変化,さらに,乾燥-湿潤繰返しが亀裂パターンおよびフラクタル次元に及ぼす影響について検討した.その結 …

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) 72(1), 27-37, 2016

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  • 405 nm diode laser, halogen lamp and LED device comparison in dental composites cure: an “in vitro”experimental trial

    Fornaini C. , Lagori G. , Merigo E. , Rocca J-P. , Chiusano M. , Cucinotta A.

    … The depth of the cure, the volumetric shrinkage, and the degree of the conversion (DC%) of the double bond during the curing process were measured. … The volumetric shrinkage showed that laser produced the lowest change in both of the composites. …

    LASER THERAPY 24(4), 265-274, 2015

    J-STAGE  Ichushi Web 

  • INFLUENCE OF CRACK ON WATER BEHAVIOR IN EMBANKMENT DUE TO RAINFALL  [in Japanese]

    KAWAJIRI Shunzo , NUNOKAWA Osamu , OTA Naoyuki

    乾燥収縮・地震・クリープ変形等によって土構造物には亀裂が発生する.一方,近年では時間雨量・累積雨量ともに増加する傾向にある.しかし,土構造物への雨水浸透や水位上昇に与える亀裂の影響については不明な点が多い.そこで本研究では人工的な亀裂を有する模型盛土に対する散水実験を行い,亀裂の本数が盛土内の水分挙動に与える影響を考察した.実験の結果,亀裂の本数が増えると盛土内水位と体積含水率の上昇が顕著となった …

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) 71(3), 204-217, 2015

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