Journal of the Architectural Institute of Korea (대한건축학회논문집)

Architectural Institute of Korea (대한건축학회)
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An Experimental Study on the Flowability and Strength Properties of Normal Strength - High Fluidity Concrete by Combination of Polycarboxylate Superplasticizer and Viscosity Modifying Admixtures

폴리카본산계 고성능 감수제와 증점제 조합에 따른 보통강도 고유동 콘크리트의 유동 및 강도특성에 관한 실험적 연구

  • 공태웅 (한양대 대학원, 선일공업(주) 기술연구소) ;
  • 이한승 (한양대 건축공학과)
  • Received : 2021.01.22
  • Accepted : 2021.04.15
  • Published : 2021.04.30
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Abstract

High fluidity concrete has a high level of fluidity with the segregation resistance and the self-compacting property without the extra work for compaction. Therefore this concrete represents high quality concrete with excellent workability and enables the easy production of heavily reinforced concrete structures of complex geometry. Despite its obvious advantages, the high cost of high fluidity concrete prevents its wider use. Also the application of typical high fluidity concrete is limited in the normal strength range (18~35 MPa) because of the uneconomical strength development due to large amount of binder. It is required to design the formulation of an economical binders, proper materials and mixtures for normal strength and high fluidity in order to expand the usability of such high fluidity concrete for general application. But if the usage of binders is low in concrete, it is reduced the fluidity and segregation resistance due to the decrease in self-compacting reduction by lack of viscosity. The aim of the study is to evaluate the fluidity and strength of high fluidity concrete for normal strength range using the combination of polycarboxylate viscosity modifying admixture (P-VMA) and methyl cellulose viscosity modifying admixture (C-VMA). To improve the fluidity of concrete, this paper investigated the effects of VMA on the slump flow, passing ability, self-compacting and segregation resistance. In addition, the effect of VMA on compressive strength was investigated. The dosage of P-VMA and C-VMA in the mixtures was 0.2%, 0.4%, 0.6% and 0.1%, 0.2%, 0.3% by weight of the total biders, respectively. As a result of this study it has been found that addition of VMA to concrete improves its fluidity and segregation resistance by increasing the viscosity of concrete, but the compressive strength decreased with increase of VMA.

Keywords

References

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