• Title/Summary/Keyword: 폴리머시멘트

Search Result 323, Processing Time 0.039 seconds

Durability of Ultrarapid-Hardening Polymer-Modified Concretes Using Metakaolin (메타카올린을 혼입한 초속경 폴리머 시멘트 콘크리트의 내구특성)

  • Yoo, Tae-Ho;Chang, Byung-Ha;Hong, Hyun-Pyo
    • Journal of the Korea institute for structural maintenance and inspection
    • /
    • v.22 no.5
    • /
    • pp.31-38
    • /
    • 2018
  • The effects of polymer-binder ratio and metakaolin content on the properties of ultrarapid-hardening polymer-modified concretes using metakaolin are examined. As a result, regardless of the metakaolin content, the flexural, compressive and adhesion in tension strength of the ultrarapid-hardening polymer-modified concretes tend to increase with increasing polymer-binder ratio. Regardless of the polymer-binder ratio, the strengths of the ultrarapid-hardening polymer-modified concretes increase with increasing metakaolin content, and reaches a maximum at metakaolin content of 5%. The water absorption, carbonation depth and resistance of chloride ion penetration of the ultrarapid-hardening polymer-modified concretes decrease with increasing polymer-binder ratio. The resistance of freezing and thawing improvement is attributed to the improved bond between cement hydrates and aggregates because of the incorporation of polymer dispersion.

Evaluation of Properties of Polymer-Modified Mortar with CSA (CSA를 혼입한 폴리머 시멘트 모르타르의 성능평가)

  • Joo, Myung-Ki;Lho, Byeong-Cheol
    • Journal of the Korea institute for structural maintenance and inspection
    • /
    • v.19 no.1
    • /
    • pp.35-44
    • /
    • 2015
  • Two main parameters were examined such as CSA content and polymer-binder ratio to find effects on the strength, water absorption, chloride ion penetration depth, carbonation depth, length change and chemical resistance of polymer-modified mortar with CSA and EVA polymer powder (EVAPP). As results, compressive, flexural, tensile, adhesive strengths, and length change of the polymer-modified mortar with CSA and EVAPP increases with increasing CSA content and polymer-binder ratio, although the water absorption, chloride ion penetration depth, and carbonation depth decrease with increasing polymer-binder ratio and CSA content, and also the chemical resistance decreases. Such strength and durability development is attributed to the high tensile strength of EVA polymer and the improved bond between cement hydrates and aggregates because of the addition of EVAPP and CSA.

Strength Properties of SBR-Modified Concretes Using Ground Granulated Blast-Furnace Slag (고로슬래그 미분말을 이용한 SBR혼입 폴리머 시멘트 콘크리트의 강도특성)

  • ;;Yoshihiko Ohama
    • Journal of the Korea Concrete Institute
    • /
    • v.14 no.3
    • /
    • pp.315-320
    • /
    • 2002
  • The effects of slag content and polymer-binder ratio on the strength properties of the polymer-modified concretes using ground granulated blast-furnace slag and a styrene-butadiene rubber (SBR) latex are examined. As a result, the compressive, tensile and flexural strengths of the SBR-modified concretes using slag increase with increasing polymer-binder ratio and slag content, and maximized at a slag content of 40 %. In particular, the SBR-modified concretes with a slag content of 40 % provide approximately two times higher tensile and flexural strengths than unmodified concretes. Such high strength development is attributed to the high tensile strength of SBR polymer and the improved bond between cement hydrates and aggregates because of the addition of SBR latex.

Durability of High-fluidity Polymer-Modified Mortar Using Redispersible Polymer Powder (재유화형 분말수지 혼입 고유동 폴리머 시멘트 모르타르의 내구성)

  • Joo Myung-Ki;Lee Youn-Su;Youn Do-Yong;Jung In-Su
    • Journal of the Korea Concrete Institute
    • /
    • v.17 no.5 s.89
    • /
    • pp.703-708
    • /
    • 2005
  • 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 the result, the setting time of the polymer-modified mortars using redispersible polymer powder tends to be delayed with increasing polymer-cement ratio, regardless of the antifoamer content. The water absorption, chloride ion penetration depth and carbonation depth of the high-fluidity polymer-modified mortars using redispersible polymer powder decrease with increasing polymer-cement ratio and antifoamer content. The resistance of freezing and thawing and chemicals improvement is attributed to the improved bond between cement hydrates and aggregates because of the incorporation of redispersible polymer powder

Physical Properties of Polymer Modified Mortar Containing FRP Wastes Fine Powder (폐FRP 미분말을 사용한 폴리머 시멘트 모르타르의 물성)

  • 황의환;한천구;최재진;이병기
    • Journal of the Korea Concrete Institute
    • /
    • v.14 no.2
    • /
    • pp.190-198
    • /
    • 2002
  • In this research the physical properties of polymer modified mortar containing pulverized FRP(Fiber-Reinforced Plastics) wastes fine powder as a part of fine aggregate were investigated. Styrene-butadiene rubber(SBR) latex, polyacrylic ester(PAE) emulsion and ethylene-vinyl acetate(EVA) emulsion were used as Polymer modifier. Polymer modified mortars containing FRP wastes fine powder were prepared with various FRP wastes fine powder replacement(5∼30 wt%) for fine aggregate and polymer-cement ratios(5∼20 wt%). The water-cement ratio, water absorption rates and hot water immersion test, compressive and flexural strengths of polymer modified mortars were tested and the results compared to those of ordinary portland cement mortar. As the results, compressive and flexural strengths of polymer modified mortar containing FRP wastes fine powder depend on the contents of FRP wastes fine powder, type and additional amounts of polymer modifier. Some of them showed higher compressive and flexural strengths than those of ordinary portland cement mortar. Especially, SBR-modified mortar showed the highest strengths properties among three types of polymer modifier. Also water absorption rates, compressive and flexural strengths of SBR-modified mortar were more superior than those of PAE or EVA-modified mortar. The optimum mix proportions of SBR-modified mortar was 20 wt% of polymer-cement ratio and 20 wt% of FRP wastes fine powder replacement. Otherwise heat cured polymer modified mortar accelerated the improvement of early compressive and flexural strengths.

Drying Shrinkage and Strength Properties of High-Fluidity Polymer-Modified Mortar (고유동 폴리머시멘트모르타르의 건조수축 및 강도 특성)

  • Joo Myung-Ki;Lee Youn-Su;Jung In-Su
    • Journal of the Korea Concrete Institute
    • /
    • v.16 no.5 s.83
    • /
    • pp.651-657
    • /
    • 2004
  • The effects of polymer-cement ratio, antifoamer content and shrinkage-reducing agent content on the air content, setting time, drying shrinkage and strength of high-fluidity polymer-modified mortars using redispersible polymer powder are examined. As a result, the air content of the polymer-modified mortars using redispersible polymer powder tends to decrease nth increasing polymer-cement ratio and antifoamer content. Regardless of the antifoamer content, the setting time of the polymer-modified mortars using redispersible polymer powder tends 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. Regardless of the antifoamer content, the flexural and tensile strengths of the polymer-modified mortars using redispersible polymer powder tends to increase with increasing polymer-cement ratio, and tend to decrease with increasing shrinkage-reducing agent content. However, the compressive strength of the polymer-modified mortars using redispersible polymer powder decreases with increasing polymer-cement ratio and shrinkage-reducing agent content.

Drying Shrinkage and Strength Properties of Ultrarapid-Hardening Polymer-Modified Mortar Using Redispersible Polymer Powder (재유화형 분말수지를 혼입한 초속경 폴리머시멘트 모르타르의 건조수축 및 강도특성)

  • Lee, Youn-Su;Joo, Myung-Ki
    • Journal of the Korea Concrete Institute
    • /
    • v.15 no.3
    • /
    • pp.409-416
    • /
    • 2003
  • The effects of polymer-cement ratio, antifoamer content and shrinkage-reducing agent content on the air content, setting time, drying shrinkage and strength 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 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. Regardless of the antifoamer content, 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.

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
    • /
    • v.19 no.1
    • /
    • pp.47-57
    • /
    • 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.

Strength Properties of Ultrarapid-Hardening Acrylic-Modified Concrete (아크릴 개질 초속경 폴리머 시멘트 콘크리트의 강도 특성)

  • Joo, Myung-Ki;Noh, Byung-Chul;Kim, Young-Sang;Choi, Kyu-Hyung
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2008.04a
    • /
    • pp.945-948
    • /
    • 2008
  • The effects of polymer-cement ratio on strength properties of ultrarapid-hardening acrylic-modified concretes. As a result, the flexural and tensile strengths of ultrarapid-hardening acrylic-modified concretes increase with increasing of polymer-cement ratio. In particular, the acrylic-modified concretes with a polymer-cement ratio of 20% provide approximately 1.5 times higher flexural and tensile strengths than unmodified concretes. Such high strength development is attributed to the high flexrul and tensile strengths of arcylic polymer and the improved bond between cement hydrates and aggregates because of the addition of acrylic polymer. However, the compressive strengths of ultrarapid-hardening acrylic-modified concretes decrease with increasing of polymer-cement ratio.

  • PDF

Effect of Addition of Ground Granulated Blast-furnace Slag on Strength Properties of Autoclaved Polymer-Modified Concrete (오토클레이브 양생 폴리머 시멘트 콘크리트의 강도성상에 미치는 고로슬래그 미분말 혼입의 영향)

  • 주명기
    • Journal of the Korea Concrete Institute
    • /
    • v.14 no.4
    • /
    • pp.608-614
    • /
    • 2002
  • The effects of slag content and polymer-binder ratio on the strength properties of autoclaved SBR-modified concretes using ground granulated blast-furnace slag(slag) and a styrene-butadiene rubber (SBR) latex are examined. As a result, the compressive and tensile strengths of the autoclaved SBR-modified concretes using slag increase with increasing slag content, and reach a maximum at a slag content 40%, and increase with increasing polymer-binder ratio. In particular, the autoclaved SBR-modified concretes with a slag content of 40% provide about three times higher tensile strength than unmodified concretes. Such high strength development is attributed to the high tensile strength of SBR polymer and the improved bond between cement hydrates and aggregates because of the addition of SBR latex.