• Title/Summary/Keyword: 시멘트 분말도

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시멘트입도가 강도에 미치는 영향

  • 임창덕
    • Cement Symposium
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    • no.5
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    • pp.88-93
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    • 1977
  • 시멘트 입도는 수화반응 속도에 밀접한 관계가 있으며 이로 인한 강도 발현 및 제반 물리특성에 크게 기여한다. 따라서 제품관리에 Blaine 및 sieve test로서 분말도를 check하고 있는바 이 분말도가 cement 물리특성에 미치는 영향을 실험실적으로 검토하였다.

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Durability of Ultrarapid-Hardening Polymer-Modified Mortar Using Redispersible Polymer Powder (재유화형 분말수지 혼입 초속경 폴리머 시멘트 모르타르의 내구성)

  • 이윤수;주명기;연규석;정인수
    • Journal of the Korea Concrete Institute
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    • v.14 no.5
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    • pp.660-667
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    • 2002
  • The effects of polymer-cement ratio and antifoamer content on the durability of ultrarapid-hardening polymer-modified mortars using redispersible polymer powder are examined. As a result, regardless of the antifoamer content, the setting time of the ultrarapid-hardening polymer-modified mortars using redispersible polymer powder tend to delay with increasing polymer-cement ratio. The water absorption and chloride ion penetration depth of the ultrarapid-hardening 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

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
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    • v.17 no.5 s.89
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    • pp.703-708
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    • 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

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
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    • v.15 no.3
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    • pp.409-416
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    • 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.

Properties of Polymer Modified Mortars Using Re-dispersible Polymer Powders (재유화형 분말수지를 이용한 폴리머 시멘트 모르타르의 특성)

  • Bae, Sang-Chan;Hyung, Won-Gil
    • Journal of the Korea Institute of Building Construction
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    • v.13 no.3
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    • pp.235-241
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    • 2013
  • In this study, a mortar was produced using re-dispersible polymer powders that addresses the defects of aqueous polymer and improves the durability of cement mortar. Also, an attempt was made to examine the properties of polymer modified mortars using re-dispersible polymer powders by strength and durability tests between ordinary Portland cement mortars and polymer modified mortars mixed with aqueous dispersion. The test showed that strength and durability are improved considerably compared with ordinary Portland cement mortar, and the performance of aqueous polymer cement mortar was considerably improved. Accordingly, it is expected that high-quality prepackaged polymer modified mortars can be produced using re-dispersible polymer powders.

Effect of Fineness and SO3 Content of Limestone Mixed Cement on Mortar (석회석 혼합시멘트의 분말도 및 SO3 함량이 시멘트 모르타르에 미치는 영향)

  • In, Byung-Eun;Kim, Jin-Sung;Nam, Seong-Young;Kim, Chun-Sik;Cho, Sung-Hyun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.05a
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    • pp.105-106
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    • 2023
  • Using the limestone powder as material that can alternate the clinker, it seems to get positive effect as filler and enhance workability of cement, but the amount of replacement can affect compressive strength of cement. This study was evaluated the effect of limestone mixed cement fineness and SO3 content on cement mortar. As a result of measuring the compressive strength, it showed 93% compared to the compressive strength of Plain 28 days at fineness 4,400 and SO3 2.6%. It is judged that additional research is necessary to express the strength equivalent to that of Plain.

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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
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    • v.16 no.5 s.83
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    • pp.651-657
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    • 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.