• Title/Summary/Keyword: Polymer cement

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Plastic Shrinkage and Durability Characteristics of Fiber Reinforced Polymer-Modified Mortars (섬유보강 폴리머 시멘트 모르타르의 초기수축균열 및 내구특성)

  • Won Jong Pil;Jang Pil Sung;Kim Myeong Kyun;Kong Tae Woong
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.05a
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    • pp.156-159
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    • 2004
  • The intention of this study is to reduce the plastic shrinkage of the polymer modified cement mortar using the PVA fiber. The durability of PVA fiber reinforced polymer cement mortar was also evaluated. The test results of PVA fiber reinforced polymer modified cement mortar were compared with plain polymer modified cement mortar(non-fiber). In conclusion, PVA fiber reinforced polymer modified cement mortar showed an ability to reduce the total crack area and maximum crack width significantly. Also. fiber reinforced polymer modified cement mortar show improved durability performance.

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A Study on the Viscosity and Compaction of Polymer-Cement Composites According to Types of Polymer for Crack Repair (균열보수용 폴리머 시멘트 복합체의 폴리머 종류에 따른 점도와 충전성에 관한 연구)

  • Park, Dong-Yeop;Kwon, Woo-Chan;Jo, Young-Kug
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2022.11a
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    • pp.161-162
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    • 2022
  • The purpose of this study is to determine the viscosity of the polymer-cement composites(PCCs) for crack repair of RC structures and to investigate its compaction. According to the study on the viscosity and compaction property of PCCs for crack repair, the viscosity of PCCs varies greatly depending on the polymer type and polymer cement ratio, and by mixing silica fume into PCCs, appropriate viscosity and excellent flow can be controlled without separation of cement and water. As a result of this study, basic data on the viscosity, fluidity, and compaction properties of PCCs for crack repair of RC structure can be obtained.

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Burn-up Characteristics of Polymer-Modified Cement Mortar Used for Building Repair (고온시에서의 폴리머 시멘트 모르타르의 연소특성에 관한 연구)

  • Kim, Hyung-Jun;Noguchi, Takahumi
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2012.05a
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    • pp.295-298
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    • 2012
  • Repair and strengthening is necessary to extend the service life of existing buildings. Polymer-modified cement mortar (PCM) has been extensively used as a high performance material particularly for finishing and repairing works in concrete building because of itsexcellent adhesion, waterproofing, resistance to chemical attack, and workability. As PCM contains organic polymer, it is necessary to clarify its properties at high temperature under fire, on which sufficient data are not available. This paper evaluated the burn-up characteristics of polymer-modified cement mortar with cone calorimeter test, non-combustibility test and flammability test with experimental parameters such as the types of polymer, unit-polymer content, polymer-cement ratio and thickness of the specimen.

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Drying Shrinkage of Ultrarapid-Hardening Polymer-Modified Mortar Using Redispersible Polymer Powder (재유화형 분말수지를 혼입한 초속경 폴리머 시멘트 모르타르의 건조수축)

  • 이윤수;주명기;정인수
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.05a
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    • pp.93-98
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    • 2002
  • The effects of polymer-cement ratio, antifoamer content and shrinkage-reducing agent content on the air content, setting time and drying shrinkage of polymer-modified mortars using redispersible polymer powder are examined. As a result the air content of the polymer-modified mortars using redispersible polymer powder tend to decrease with increasing polymer-cement ratio and antifoamer agent content. Regardless of the antifoamer content, the setting time of the polymer-modified mortars using redispersible polymer powder tend to delayed with increasing polymer-cement ratio. Irrespective of the antifoamer content, the drying shrinkage of the polymer-modified mortars using redispersible polymer powder tend to decrease with increasing polymer-cement ratio and shrinkage-reducing agent content.

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Durability of Ultrarapid-Hardening Polymer-Modified Mortar (초속경 폴리머 시멘트 모르터의 내구성)

  • 이윤수;주명기;정인수
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.11a
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    • pp.153-158
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    • 2001
  • The effects of polymer-cement ratio and shrinkage-reducing agent content on the durability characteristics of ultrarapid-hardening polymer-modified mortars using redispersible polymer powder are examined. As a result, the flexural and tensile strengths of the ultrarapid-hardening polymer-modified mortars using redispersible polymer powder tend to increase with increasing polymer-cement ratio, and tend to decrease with increasing shrinkage-reducing agent content. However, the compressive strength of the ultrarapid-hardening polymer-modified mortars using redispersible polymer powder decrease with increasing polymer-cement ratio and shrinkage-reducing agent content. And, water absorption and mass change of chemicals resistance of ultrarapid-hardening polymer-modified mortars using redispersible polymer powder tend to decrease with increasing polymer-cement ratio.

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Deformation Characteristics of Reinforced Polymer Concrete Beams (철근보강 폴리마 콘크리트보의 변형특성)

  • 연규석
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.30 no.1
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    • pp.63-72
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    • 1988
  • The primary objective of the study was to find the deformation characteristics of reinforced polymer concrete beams. A test program was carried out to compare the behavior in deformation of polyester and MMA concrete beams with cement concrete beams but with varying ratios of tensile reinforcement. From the results the following conclusions can be made. 1.The various strengths of polymer concrete ware very high compared to the strengths for cement concrete. Also, compared to conventional concrete beams, flexural strength of reinforced polymer concrete beams was distinctly higher for the same section and steel ratios. 2.The polymer concrete beams exhibit large deflections accompanied by relatively high strengths as compared to cement concrete beams. 3.The average ultimate strain at the extreme compression fiber of polymer concrete beams was 0.01 1 cm / cm, and this value was about three to four times as large as that of cement concrete beams, 4.The polymer concrete beams developed more cracks which were more wide crack distribution spacing than the cement concrete beams, and the beams failed in a more ductile manner. 5.The reinforcing steel ratio has a significant effect on the beam strength, load-deflection response, stress-strain curve, and crack pattern of polymer concrete beams.

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Durability of High-Fluidity Polymer-Modified Mortar (고유동 폴리머 시멘트 모르타르의 내구성)

  • Yoon Do Yong;Lee Youn Su;Joo Myung Ki;Jung In Su
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.11a
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    • pp.691-694
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    • 2004
  • The effects of polymer-cement ratio and antifoamer content on the setting time and durability of high-fluidity polymer-modified mortars using redispersible polymer powder are examined. As a result, the setting time of the polymer-modified mortars using redispersible polymer powder tend to delayed with increasing polymer-cement ratio, regardless of the antifoamer content. The water absorption and chloride ion penetration depth of the high-fluidity polymer-modified mortars using redispersible polymer powder decrease with increasing polymer-cement ratio and antifoamer content. The water absorption and chloride ion penetration improvement is attributed to the improved bond between cement hydrates and aggregates because of the incorporation of redispersible polymer powder.

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Fundamental Propeties of Premix Type Polymer Cement Mortar (프리믹스 타입 폴리머 시멘트 모르터의 기초적 성질)

  • 연규석;주명기;최동순;김기락;김남길
    • Proceedings of the Korea Concrete Institute Conference
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    • 1997.10a
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    • pp.641-646
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    • 1997
  • Polymer cement mortar which is used as material for aging concrete structures is generally mixed manually and applied on the job site. but, to secure the required quality of the mortar, pre-mixed polymer cement mortar is favored. This study was initiated to four different pre-mixed polymer cement mortars which are produced in Korea. The for pre-mixed mortars were selected and tested with respect to physical and mechanical properties an proved that their qualities were better than those of common cement concrete mortars.

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A Study on the Improvement of Adhesion in Tension and Flexure of Polymer Cement Mortar Depending on Various Test Methods (시험방법에 따른 폴리머 시멘트 모르타르의 인장 및 휨접착강도 개선에 관한 연구)

  • Jo, Young-Kug
    • Journal of the Korea Institute of Building Construction
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    • v.19 no.1
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    • pp.47-57
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    • 2019
  • The purpose of this study is to evaluate the improvement effect of adhesion in tension and flexure of polymer cement mortars that have widely used as a repair-reinforcement material in construction field according to adding of polymer dispersions depending on different three types test methods. From the test results, the adhesion performance is improved with a raise in polymer-cement ratio irrespective of the type of polymer. The maximums of A type adhesion in tension, B type adhesion in tension and adhesion in flexure show 1.90 times, 2.17 times and 1.83 times, respectively that of plain cement mortar. The relative strength ratios, B type adhesion in tension and adhesion in flexure of polymer cement mortars to tensile and flexural strengths of plain mortar respectively are in ranges of 50.1% to 101.7% and 73.8% to 132.9% compared to 46.9% of plain mortar. It is apparent that polymer cement mortars with EVA and polymer cement ratios of 10% to 15% are recommended considering its adhesion performance and cost as a repair-reinforcement material in construction field.

A Study on the Resistance for Frost Damage of Polypropylene Fiber Reinforced Light Weight Polymer Cement Concrete (폴리프로필렌섬유보강 경량 폴리머 시멘트 콘크리트의 내동해성에 관한 연구)

  • 소형석;소승영;소양섭;박종호;탁재호
    • Proceedings of the Korea Concrete Institute Conference
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    • 1995.10a
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    • pp.89-92
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    • 1995
  • For the development of lilght weight cement concrete with high durability, this study used perlite and paper sludge ash by the light weight material, and polypropylene fiber by the reinforcment, and poly-acrylic ester emulsion by the matrix improvement. According to the increasing mixture ratio of fiber and use of polymer, the light weight polypropylene fiber reinforced polymer cement ratio of fiber and use of polymer, the light weight polypropylene fiber reinforced polymer cement concrete were showed high resistance for frost damage.

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