• Title/Summary/Keyword: 고성능 시멘트

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A Study on Viscosity Reducing of Cement-Based Materials by Replacing Byproducts and Adding Low-Viscosity Type HRWR (산업부산물 치환 및 저점도형 고성능 감수제를 사용한 시멘트 계열 재료의 점도저하 방안 연구)

  • Son, Bae-Geun;Han, Dongyeop
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.5 no.4
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    • pp.353-358
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    • 2017

  • The aim of this research is providing a fundamental idea on reducing viscosity of high performance cementitous materials. In rheological aspect, to determine the fluidity of the cementitious materials, both yield stress and viscosity should be controlled. For the high performance cementitious materials with low water-to-binder ratio and high volume fraction, it was difficult to reduce the viscosity with superplasticizer while reducing yield stress was relatively easy. Hence, in this research, with the goal of reducing viscosity of the cementitious materials, both ways of reducing viscosity were suggested: achieving proper combination of powder conditions, and adding low-viscosity typed water reducer. First, by replacing various byproduct powders, specifically, raw coal ash and wasted limestone powder showed favorable results on reducing viscosity of the cement paste. Regarding the low viscosity typed superplasticizer, it showed a good performance on reducing viscosity comparing with generic superplasticizer. Therefore, based on the results of this research, it is expected to provide a fundamental idea on reducing viscosity of cementitious materials by various methods.

  • https://doi.org/10.14190/JRCR.2017.5.4.353 인용 PDF KSCI

Development of Admixtures of Polycarboxylic acid (폴리카본산계 유동화 혼화제 개발)

  • 전용진;조석형;홍영호;한종필
    • Proceedings of the KAIS Fall Conference
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    • 2001.05a
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    • pp.300-302
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    • 2001

  • 폴리카본산계 기능성 고분자를 합성해서 고성능 감수제 원료로 활용하여 고유동화 혼화제를 개발하고자 한다. 폴리카본산계 기능성 고분자를 합성한 후, 이를 고유동, 고강도 혼화제 원료로의 제반 물성을 확인하고, 이를 현장에 적용하여 현재의 제품을 획기적으로 개선하고, 혼화제 품질의 우위성을 확보하기 위해 1) 시멘트 및 골재 표면에서의 적절한 계면활성을 갖는 분자설계를 하였으며, 2)분자량의 조절 기술의 개발을 개발하였다. 합성에 있어서 첫째, 시멘트 및 골재 표면에서의 적절한 계면활성을 갖는 분자설계와 둘째, Mw 5,000정도의 분자량을 갖는 감수제의 합성기술을 개발하였다. 이렇게 제조된 고성능 유동화제의 화학구조 해석을 해석하고 분자량 및 분자량 분포를 측정한 다음, 시멘트 페이스트의 유동성, 점도, 슬럼프로스 등을 측정하여 고성능 유동화제의 성능인 시멘트 페이스트의 유동성을 시험하였다. 그 결과 고유동성을 갖는 것과 장시간 안정한 유동성을 나타내었으며, 경과 시간에 따른 겉보기 점도변화를 측정한 결과 점도의 상승이 초기에 일어나다가 시간의 경과에 따라 점도가 감소하는 경향을 나타내었다. 따라서 경과시간에 따른 유동성 손실을 억제할 것으로 기대한다.

Fluidity Performance Evaluation of Low Viscosity Typed Superplasticizer for Cement-Based Materials Incorporating Supplementary Cementitious Materials (혼화재료를 치환한 시멘트 계열 재료에 대한 저점도형 고성능 감수제의 유동 성능 평가)

  • Son, Bae-Geun;Lee, Hyang-Seon;Lee, You-Jeong;Han, Dong-Yeop
    • Journal of the Korea Institute of Building Construction
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    • v.19 no.3
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    • pp.219-228
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    • 2019

  • The aim of the research is to provide a fundamental data of low viscosity typed superplasticizer (SP) on cement-based materials incorporating various supplementary cementitious materials (SCMs). As a relatively new product, low-viscosity typed SP has introduced for high performance concrete with high viscosity due to its high solid volume fraction with various SCMs. However, there are not enough research or reports on the performance of the low viscosity typed SP with cement-based materials incorporting SCMs. hence, in this research, for cement paste and mortar, fluidity and rheological properties were evaluated when the mixtures contained various SCMs such as fly ash, blast furnace slag, and silica fume. From the experiment conducted, it was checked that the low viscosity typed superplasticizer decreased the plastic viscosity of the mixture as well as the yield stress. From the results of this research, it is expected to contribute on introduction of new type SP for high performance concrete or high-viscous cementitious materials.

  • https://doi.org/10.5345/JKIBC.2019.19.3.219 인용 PDF KSCI HTML