• Title/Summary/Keyword: mortar section

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Performance Evalution of Chloride Ion Penetration of Polymer Mortar for Section Restoration (단면복구용 폴리머 모르타르의 염소이온 투과성 평가)

  • Park, Sung-Woo;Kang, Dong-Soo;Han, Bog-Kyu
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05b
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    • pp.285-288
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    • 2006
  • Recently, polymer mortar has been developed not only more improving the performance of modified mortar with polymer, but also protecting and repairing materials of structures, especially in marine environment because of their excellent performance to improve compressive strength, flexural strength, and adhesive strength. however, in fact, these rehabilitation techniques in marine environment, which consist of removing delaminated areas of concrete, cleaning affected steel and patching with polymer mortar, have proven to be ineffective for marine structures. Also, repairs are often repeated every several years. Therefore, it is neccessary to research performance evalution of chloride ion penetration of polymar mortar for section restoration.

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Evaluation for Corrosion Prevention Properties of Steel Bar Corrosion Repair Method Composed of Primer and Section Restoration Mortar with Corrosion Inhibitor (방청제 혼입 프라이머 및 단면복구모르타르를 사용한 철근부식보수공법의 철근방청성능 평가)

  • Cho Bong Suk;Jang Jae Bong;Jang Jong Ho;Kim Yong Ro;Kang Suk Pyo;Kim Moo Han
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.11a
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    • pp.793-796
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    • 2004
  • In domestic, various repair materials and method systems to keep up with these reinforced concrete deteriorated due to salt damage, carbonation. chemical decay et. being developed and applied. However, present polymer cement mortar applied to section restoration system cause the problem of long-term working and economica] efficiency. because that is divided into two process of liquid corrosion prevention agent and polymer cement mortar. In this background, accelerated test with due regard to $3\%$ NaCl soaking and autoclave cure was performed to confirm steel bar corrosion prevention properties of polymer cement mortar mixed with corrosion prevention agent of powdered type. In conclusion. we confirmed application possibility and excellency of steel bar corrosion prevention properties of polymer cement mortar mixed with corrosion prevention agent of powdered type comparing general polymer cement mortar applied to section restoration system of present study.

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Tensile capacity of mortar-filled rectangular tube with various connection details

  • Kim, Chul-Goo;Kang, Su-Min;Eom, Tae-Sung;Baek, Jang-Woon
    • Steel and Composite Structures
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    • v.44 no.3
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    • pp.339-351
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    • 2022
  • A mortar-filled rectangular hollow structural section (RHS) can increase a structural section property as well as a compressive buckling capacity of a RHS member. In this study, the tensile performance of newly developed mortar-filled RHS members was experimentally evaluated with various connection details. The major test parameters were the type of end connections, the thickness of cap plates and shear plates, the use of stud bolts, and penetrating bars. The test results showed that the welded T-end connection experienced a brittle weld fracture at the welded connection, whereas the tensile performance of the T-end connection was improved by additional stud bolts inserted into the mortar within the RHS tube. For the end connection using shear plates and penetrating stud bolts, ductile behavior of the RHS tube was achieved after yielding. The penetrating bars increased load carrying capacity of the RHS. Based on the analysis of the load transfer mechanism, the current design code and test results were compared to evaluate the tensile capacity of the RHS tube according to the connection details. Design considerations for the connections of the mortar-filled RHS tubes were also recommended.

Stability Analysis of Marine Structure Foundation Constructed by Deep Mortar Piles (심층몰탈파일로 조성된 항만구조물 기초의 안정성 검토)

  • 천병식;여유현;김경민;양진석;김도식
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2001.05a
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    • pp.228-233
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    • 2001
  • In this case study, under conideration of field situations, such as increase of water level, height increment of the marine structure, dredging and backfill, the stability analysis of sliding and lateral flow of the marine structure in OOOharbor was carried out, and foundation reinforcement methods was presented. based on the results of site investigation, the stability analysis of slope sliding and lateral flow was performed as following. In section BH-1, 2, the analysis was performed in two cases that the marine structure was heightened and filled, and not heightened and filled. In section BH-1, 4, heightened and filled. The analysis results showed that the stabilities of slope sliding and lateral flow in section BH-1, 2, 3, 4 were unstable. After additional reinforcements with Deep Mortar Pile, the stabilities in section BH-1, 2, 3, 4 were evaluated as efficiently large.

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Bonding Strength of bonded Polymer Concrete on Cured Cement Concrete (경화된 콘크리트에 접착된 폴리머 콘크리트의 부착강도 특성)

  • 홍승호;권순민
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.05a
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    • pp.353-358
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    • 2001
  • The cement concrete pavements are designed twenty years of performance life in Korea. At the present time, some expressways have been elapsed seventy percent of performance life which are detecting local failures. The most repair methods using to repair failures are partial depth repair and full section repair. These methods are most important bonding strength between rapid curing materials and substrate concrete pavements. This study was performed to evaluate bonding strength of the composites section made of rapid curing material and substrate concrete pavements. The pull-out tester was used to test bonding strength for the composites section made of each materials. In the results of the test, the bonding strength values of the epoxy mortar and acrylic mortar are higher than those of the other materials. The performance life of repaired section is affected by various factor. The bonding strength of bonded composites section may be affect the performance life, significantly.

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Analysis of Chloride Penetration in Mortar Sections using Laser Induced Breakdown Spectroscopy (LIBS를 활용한 모르타르 단면 염화물 침투 분석)

  • Park, Won-Jun
    • Journal of the Korea Institute of Building Construction
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    • v.21 no.6
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    • pp.583-591
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    • 2021
  • In this study, the applicability and reproducibility of LIBS in the analysis of chloride penetration in the mortar section were investigated. Standard analysis (IC, potentiometric titration) and LIBS analysis were simultaneously performed on the accelerated and immersed mortar by chloride concentration. Through LIBS analysis after making an eluate at the same depth for each concentration, the signal intensity of chloride ions was confirmed according to the depth and concentration at the wavelength of 837.59 nm, and a correlation between the LIBS signal intensity and the chloride concentration was confirmed. Although it is an aqueous solution-based LIBS analysis, the applicability and reproducibility of LIBS were confirmed not only for the incorporation of chloride but also for the amount of permeated chloride.

Carbonation Treatment of EAF Slag for Using Aggregate of Concrete (EAF-Slag의 콘크리트용(用) 골재(骨材)로의 활용(活用)을 위한 탄산화(炭酸化) 처리(處理) 연구(硏究))

  • Yoo, Kwang-Suk;Ahn, Ji-Whan;Lee, Kyung-Hoon
    • Resources Recycling
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    • v.18 no.3
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    • pp.36-41
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    • 2009
  • The objectives of this study are focusing on the issue with efficiently recycling for EAF slag as construction material such as an aggregate of concrete. This study can be classified mainly into two categories: the first section is the carbonation treatment of Electric Arc Furnace(EAF)-slag for obtaining soundness as using aggregate of concrete. And the second section is the application of carbonated EAF-slag on the mortar test to evaluate the stability and mechanical property, which is compressive strength, according to the replacement of EAF-slag on the mortar. It was known that pH of EAF-Slagle according to carbonation time decreases drastically to 7 within several sec of carbonation, and a calcite is formed on the surface of EAF slag. The formation of calcite during the carbonation process of EAF slag lead to fill at pore in the texture of EAF-Slag surface, and than the porosity of EAF-slag decreases with carbonation process. In the mortar test, compressive strength, according to the replacement of EAF-Slag to sand on the mortar, the compressive strength of mortar increased as the 50% replacement ratio of EAF slag for sand was above 10% higher than that of reference mortar according to 50% replacement of EAF slag.

Fundamental Properties of Fiber Composite Spray Mortar (습식 스프레이용 섬유복합 모르타르의 기초적 특성)

  • Lee, Gun-Cheol;Song, Yong-Won;Ryu, Gum-Sung;Goh, Kyoung-Taek;Kim, Jin-Soo;Han, Cheon-Goo
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05b
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    • pp.305-308
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    • 2006
  • This paper is to investigate the strength, impact endurance and shrinkage of wet spraying type fiber composite mortar for repair material depending on fiber type and product kinds. Fiber composite mortar containing PVA fiber had the highest strength compared to that using any other fiber. Especially, The use of PVA fiber results in a remarkable enhancement in impact strength and an improved volumetric stability. Accordingly, it is confirmed that fiber composite mortar containing PVA fiber has remarkable performance as repair material of damaged section of concrete.

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A Study on the Physical Characteristics of Repair Mortar Using Sepiolite (Sepiolite를 보강섬유로 사용한 단면보수 모르타르의 물리적 특성변화에 관한 연구)

  • Lee, Mun-Hwan;Song, Tae-Hyeob;Lee, Sea-Hyun;Park, Seung-Ho
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05b
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    • pp.337-340
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    • 2006
  • Utilize several kinds of reinforcement fibers to control workability and surface crack in occasion of mortar used in dilapidated concrete section repair public law. Polypropylene or poly vinyl alcohol that is hydrophilic fiber etc. is used much usually with this reinforcement fiber. Reinforcement fiber does important action that control crack that enhances coherence between material and happens at dry contraction. In this study, wished to use Sepiorite that inorganic materials and affinity such as cement are excellent nature inorganic world fiber and improve repair mortar performance. In this study, as reinforcement fiber, wished to grasp physical characteristics that uses Sepioraiteu and happens this time and grasp application possibility of concrete's repair mortar.

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Evaluation Repair Performance of Damaged R/C Beams due to Reinforcement Corrosion (철근 부식에 의해 단면이 손상된 R.C보의 보수성능평가)

  • Jeong, Sang-In;Hong, Geon-Ho;Shin, Yeong-Soo;Chung, Lan
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.04a
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    • pp.733-738
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    • 2000
  • This paper was aimed to evaluate the structural performance of flexural members repaired by polymer cement and epoxy mortar at soffit. Main test variables were repair materials, ratio of reinforcement and additional reinforcing bars. Test results shows that the repaired beams could change flexural capacity by materials and additional reinforcing bars. In polymer cement, the section repaired can carry same load, cracking moment and the flexural stiffness of the monolithic beams with same size. In epoxy mortar, all data were greater than the shotcrete. However, note that epoxy mortar may conduct member into brittle failure mode.

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