• Title, Summary, Keyword: 혼화재료

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Effects of Admixtures in Properties of Polymer Cement Mortar for Concrete Repair (혼화재료가 보수용 폴리머 시멘트 모르타르의 성질에 미치는 영향)

  • Song, Hyung-Soo;Lee, Chin-Yong;Min, Chang-Shik
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.11 no.1
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    • pp.85-94
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    • 2007
  • The EVA polymer is used as a modifier in the repair mortar, which contains various admixtures and mineral admixtures. It has been reported that the effect of polymer in cement mortar by the cement-polymer ratio only, but effect of admixtures over the polymer mortar was unknown. In this study, the fresh and mechanical properties of polymer cement mortar influenced by the range of admixtures(CSA expansive addictive, CSA accelerator, gypsum, silica fume) ratio were investigated.

A Study on the Experimental of Basic Property of Cement Mortars using the Metakaolin (메타카올린을 이용한 시멘트 모르타르의 기초물성에 관한 실험적 연구)

  • Choi, Kang-Seok;Son, Hong-Woo;Kim, Myung-Sik;Beak, Dong-Il;Jang, Hui-Suk;Kim, Chung-Ho
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.893-896
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    • 2008
  • As this study is to test fundamental properties of cement mortars using in Metakaolin. Recently concern is increasing for concrete durability because of an increase in the concrete structure exposed to bad environments. In the event that mineral admixture Added, microstructure will be fined, so durability can be good. Also, the study for new admixture is progressing expect that admixture widely used, for example, silica fume, fly-ash, and slag, etc. Therefore this study is making an experiment on fundamental properties of diversities sample curing at water, sea water, 10% sodium sulfate solution, and magnesium sulfate solution, to compare using for metakaolin with silica fume and fly-ash.

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Durability Assessment for Crushed Sand Wet-mix Shotcrete Mixed with Mineral Admixtures (부순모래를 사용한 습식 숏크리트의 광물성 혼화재료 혼입에 따른 내구성 평가)

  • Lee, Kyeo-Re;Han, Seung-Yeon;Nam Gung, Kyeong;Yun, Kyong-Ku
    • Journal of the Korea Concrete Institute
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    • v.26 no.5
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    • pp.607-614
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    • 2014
  • The purpose of this dissertation was to investigate the effect of mineral admixtures, such as fly ash, blast furnace slag powder, meta kaolin and silica fume, on the basic properties and durability of crushed sand shotcrete, selecting a series of shotcrete mixtures with a variable admixture. Compressive strength increased as the content of mineral admixtures increased, specially it was the most effective when using meta kaolin both at sample specimen and core after shotcreting. Rapid chloride ion permeability test and sulfuric acid resistance test showed that both durability increased as the substitute rate of mineral admixture increased. In air void analysis with image analysis, the targeted the spacing factor and specific surface were not satisfied because air-entrained agent was not used.

Experimental Study on the Properties of Concrete by the Kinds of Admixture and the Replacement Ratios of Activated Hwangtoh (혼화재 종류 및 활성황토 대체율별 콘크리트의 공학적 특성에 관한 실험적 연구)

  • 최희용;김무한;김문한;황혜주;최성우
    • Journal of the Korea Concrete Institute
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    • v.13 no.2
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    • pp.123-129
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    • 2001
  • Pozzolan is to improve the strength and the durability of concrete as a result of the pozzolanic reaction, Broadly speaking, pozzolanic materials can be artificial materials, such as slica fume and fly ash, and natural material, such as rice husk ash, clay, volcanic ash, clayish pozzolan. Hwangtoh is a mineral which belongs to a group of matakaolin, especially halloysite, and the main elements is SiO$_2$, Al$_2$O$_3$, Fe$_2$O$_3$. The purpose of this study is to examine the application of Hwangtoh for the concrete admixtures, the composition of this study is shown as follows. Chapter I is analysis for properties of concrete as the kinds of admixture, and Chapter H is analysis for properties of concrete as the replacement ratio of activated Hwangtoh. As a result of this study, Hwangtoh is found to have high practical use as pozzolanic material, and the pertinent range of replacement ratios of Hwangtoh on cement are 10∼20 %.

The Research on Possibility as Mineral Admixture of Agriculture by-product (농업부산물의 혼화재료로써 사용가능성에 관한 연구)

  • Jeong, Euy-Chang
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.178-179
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    • 2019
  • The purpose of this study was to investigate the possibility as mineral admixture of agriculture by-product. XRD and XRF analysis were performed on rice straw ashes at various combustion temperatures to identify chemical compositions. Also to evaluate properties of pozzolanic reaction, pH change method was tested.

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