Search Results 1-20 of 95

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  • Effect of Sprayed Mortar on Reinforced Concrete Beams Wound with Aramid Fiber Rope  [in Japanese]

    関島 謙蔵 , 出雲 淳一

    関東学院大学工学総合研究所報 (48), 57-66, 2020-03

  • Follow-up Survey of Reinforced Concrete Abutments Using Thermal Sprayed Galvanic Anode With CP Function  [in Japanese]

    山本 誠 , 武藤 和好 , 山口 和宏 , 宮田 弘和

    コンクリート構造物の補修,補強,アップグレード論文報告集 Proceedings of the Concrete Structure Scenarios, JSMS 19, 473-478, 2019-10

  • PUNCHING TEST TO EARLY-AGE BASE CONCRETE AND ITS DISCRETE ELEMENT SIMULATION  [in Japanese]

    KIKKAWA Naotaka , HIRAOKA Nobutaka , ITOH Kazuya

    … <p> Sprayed concrete lining is often applied to the excavated rough surface of face and its circumference in order to prevent the accidents due to rock falls in a cutting face of tunnel construction. …

    Journal of Japan Society of Civil Engineers, Ser. F1 (Tunnel Engineering) 75(1), 56-74, 2019

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  • EMPIRICAL RESEARCH ON PERFORMANCE EVALUATION OF HIGHLY DURABLE RC ROAD BRIDGE DECK AT CONSTRUCTION PROCESS  [in Japanese]

    SAKAKIBARA Naoki , TANAKA Yasushi , SATO Kazunori , IWAKI Ichiro

    … <p>Since deicing salt is sprayed on the reinforced concrete(RC)road bridge decks in the cold regions in winter season, complex deterioration of salt damage, freezing damage under a salt environment and alkali silica reaction(ASR)is often found on bridge decks in recent years, even in areas with low traffic. … In this study, the performance of casted concrete was evaluated at the stage of the construction process in order to ensure the durability of casted RC road bridge deck. …

    Cement Science and Concrete Technology 72(1), 277-284, 2019

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  • Health survey of concrete structures by Non-Contact Acoustic Inspection Method(8)A case for sprayed lining concretes of the underground power station  [in Japanese]

    歌川 紀之 , 黒田 千歳 , 上地 樹 , 杉本 和子 , 杉本 恒美 , 森岡 宏之

    佐藤工業技術研究所報 Report of Satokogyo Technical Research Institute (43), 28-36, 2018

  • EXPERIMENTAL STUDY ON FLEXURAL REINFORCEMENT OF REINFORCED CONCRETE BRIDGE PIERS USING SMALL-DIAMETER HIGH-STRENGTH STEEL BARS  [in Japanese]

    MISAWA Takashi , HIRONAKA Tetsuya , YAMAGUCHI Osamu , UJI Kimitaka

    …  Reinforced concrete jacketing and steel plate jacketing are widely used to increase the flexural strength of existing reinforced concrete bridge piers. … This study proposes an economical seismic retrofit method for increasing the flexural strength of an existing reinforced concrete pier by placing small-diameter steel bars around the pier for flexural and shear reinforcement and jacketing the pier with a thin and light layer of sprayed mortar. …

    Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) 74(3), 139-157, 2018

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  • Study on internal water repellency and mechanical characteristics of cementitious materials with the addition of hydrophobic agent  [in Japanese]

    Asamoto Shingo , Furuta Haruka , Luan Yao , Yoneda Taiju

    … <p>In order to inhibit water penetration into concrete, hydrophobic surface impregnation is generally used to protect concrete, but there is concern that water repellency may decrease greatly when cracks occur. … It was found that mortar with sand sprayed with silicone-based agent had a relatively high contact angle and hydrophobicity under wetting and drying cycles even if cracks occurred, although compressive strength decreased to some extent. …

    Concrete Research and Technology 29(0), 11-19, 2018

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  • Basic Analytical Study of CFRP Grid-Sprayed Mortar Behavior in Shear Strengthening of a RC Beam  [in Japanese]

    TRAN Vu Dung , UJI Kimitaka

    … <p>The shear failure of reinforced concrete (RC) beams is extremely dangerous as it can occur suddenly and it is difficult to predict. … Recent years, CFRP material is promising alternatives for rehabilitation of deteriorated concrete members. … In this study, it is assumed that, shear resistance of a RC beam decreases because of corroded stirrups, thus it need to be strengthened by using carbon fiber-reinforced polymer (CFRP) grid and sprayed mortar. …

    Journal of the Society of Materials Science, Japan 66(4), 306-311, 2017

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  • <b>Spalling Prevention Method for Tunnel Lining Using Polyurea Resin</b>

    SHIMAMOTO Keisuke , YASHIRO Kazuhide , ITO Naoki

    … <p>Preventing concrete spalling is very important in tunnel maintenance because it can be a direct hazard to the operational safety of trains. … This paper deals with the applicability of sprayed polyurea as a method to prevent spalling of tunnel linings. … According to the model tests, when the arch crown displacement reached 30mm, bending compressive fractures appeared around the shoulder of the lining, no spalling occurred in the lining because the polyurea covered the exfoliated concrete. …

    Quarterly Report of RTRI 58(3), 217-222, 2017

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  • VERIFICATION OF REINFORCING TECHNIQUE AND STRENGTHENING EFFECT OF BOX CULVERT USING METAL-GRIG EXPANDED TYPE  [in Japanese]

    ABE Tadashi , NITTA Hiroyuki , SHIOTA Keisuke , YOSHIOKA Yasukuni

    … <p>This study verified load carrying capacity and stiffening effect of a road bridge culvert reinforced using Metal-Grid expanded type and sprayed with PCM. … The reinforced culvert were installed with Metal-Grid expanded type, sprayed with epoxy adhesive to enhance adhensivity then sprayed with PCM at 40mm(increased thickness 30mm). …

    Cement Science and Concrete Technology 71(1), 540-547, 2017

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  • MODEL TEST AND TEST CONSTRUCTION REGARDING SPRAYED POLYUREA FOR SPALLING PREVENSION METHOD IN TUNNELS  [in Japanese]

    SHIMAMOTO Keisuke , YASHIRO Kazuhide , KAWAKAMI Yoshiteru , KOSHIISHI Masami , IDE Kazunao

    …  Preventing concrete spalling is very important in tunnel maintenance because spalling in railway tunnels may causes a direct safety hazard to train operations. … This paper compared sprayed polyurea with alamido fiber sheet in bending test, model tunnel loading test. …

    Journal of Japan Society of Civil Engineers, Ser. F1 (Tunnel Engineering) 73(3), I_21-I_31, 2017

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  • EXPERIMENTAL STUDY ON CHLORIDE ION PENETRATION AND ITS REPAIR AT THE END PART OF CONCRETE BRIDE AFFEVCTED BY DE-ICING SALTS  [in Japanese]

    KUBO Yoshimori , YANO Toshiki , MOMIYAMA Yoshiyuki , HASHIZUME Yasunori

    … Since the banned studded tire on the road, concrete structures deteriorated severely by chloride induced corrosion during a short term have been reported when the de-icing salt are scatterd on the road in cold region and mountain area to maintain the safety of car traffic in winter. …

    Cement Science and Concrete Technology 69(1), 448-454, 2015

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  • A study on deterioration mechanism of sprayed concrete on a cut slope  [in Japanese]

    YASUDA Kenya , KIKUCHI Shinji , HATAKEYAMA Takeichi , SATO Hiroki , NAGAI Hiroshi

    Journal of the Japan Landslide Society 51(6), 233-236, 2014

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  • Surface and Interfacial Analysis Using Electrochemical Impedance Measurement  [in Japanese]

    Katayama Hideki

    … The degradation of organic coated steels, the structure of thermally sprayed coating exposed to outdoors for a long term, and the corrosion performance of reinforcing steel bars in concrete were estimated by electrochemical impedance method.<br> …

    Journal of the Japan Institute of Metals and Materials 78(11), 419-425, 2014

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  • Effects of the unit and the joint mortar on moisture transfer caused by rainfall of concrete block masonry  [in Japanese]

    Sakata Naoko , Senbu Osamu , Hasegawa Takuya

    … This paper deals with the effects of the type of joints, mortars and units on moisture transfer of Concrete Block(CB) members caused by model rain fall. … We carried out the measurement of change of moisture content in various CB members sprayed water using electrode and thermocouple. …

    Summaries of Technical Papers of Annual Meeting Japan Society for Finishings Technology 2013(0), 35, 2013

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  • Durability Evaluation of Steel and Recycled-PET Fiber Reinforced Concrete with a Single Crack by Salt Spray Test  [in Japanese]

    OKUBO Seisuke , FUKUI Katsunori , OCHI Tsuneo , ISHIKAWA Tsuneo , HASEGAWA Makoto

    … Fiber reinforced concrete (FRC) is considered to offer improved resistance against crack defects and higher toughness compared to plain concrete. … Specimens for short-term tests were salt sprayed for a period of one week and then placed in a dry air-conditioned room for another week. …

    Journal of MMIJ 128(7), 455-462, 2012-07-25

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  • Present State and Some Issues on Tunnel Technologies  [in Japanese]

    NISHIMURA Kazuo

    … Main topics on mountain tunnel are single shell lining by sprayed concrete, curing technology of lining concrete and concave surface of tunnel. …

    地盤工学会誌 = / the Japanese Geotechnical Society 60(2), 1-5, 2012-02-01

    NDL Digital Collections 

  • SHEAR CAPACITY EVALUATION OF RC BEAMS STRENGTHENED BY UNDERSIDE OVERLAY METHOD USING HIGH-PERFORMANCE POLYMER CEMENT MORTAR  [in Japanese]

    MIZUKOSHI Mutsumi , YAMAMOTO Hikaru , HIGASHIYAMA Hiroshi

    … As a result, RC beams without web reinforcement strengthened by the underside sprayed-on overlay method using high-performance PCM reached diagonal tension failure without any slip in the interface between the existing concrete and PCM. …

    Cement Science and Concrete Technology 66(1), 584-591, 2012

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  • PORE STRUCTURE AND CHLORIDE ION BINDING CAPACITY OF CEMENT HARDENED BODY UNDER FROST DAMAGE  [in Japanese]

    HASHIMOTO Katsufumi , YOKOTA Hiroshi

    … Frost damage, which is the deterioration due to freeze and thaw of pore solution is causes scaling, pop-out and cracks on surface of concrete members, is an important issue in the durability of concrete structures in cold regions. … Deicing agents are sprayed in order to prevent frost damage. … When concrete structure is exposed to deicing solution containing chlorides, steel corrosion would occur due to chloride ingress in RC members. …

    Cement Science and Concrete Technology 66(1), 460-465, 2012

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  • Experimental Study on Sprayed FRP System for Strengthening Reinforced Concrete Beams

    Lee Kang Seok

    … The purpose of this study is to develop a new technique for strengthening and repairing existing concrete structures with sprayed fiber-reinforced polymers (FRP) by mixing chopped carbon or glass fibers with epoxy or vinyl ester resins in open air and randomly spraying the mixture onto the concrete surface with compressed air. … The use of sprayed FRP for repair and strengthening purposes using epoxy or vinyl ester resins has never been fully investigated. …

    Journal of Advanced Concrete Technology 10(6), 219-230, 2012

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