Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Understanding the Properties of Cement Mortar with Employment of Stone Dust considering Particle Size Distribution

입도분포를 고려한 석분 사용에 따른 시멘트 모르타르 성질의 변화 이해

  • Kang, Su-Tae (Department of Civil Engineering, Daegu University)
  • Received : 2016.09.30
  • Accepted : 2017.01.06
  • Published : 2017.01.31
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Abstract

This study investigates the properties of a high-performance cementitious composite with partial substitution of stone dust for fine aggregate. The relationship between the properties and particle size distribution was analyzed using several analytical models. Experiments were carried out to examine the flowability, rheology, and strength of cement mortars with different stone-dust replacement ratios of 0-30 wt.%. The results showed improved flowability, lower rheological parameters (yield stress and plastic viscosity), and improved strength as the amount of stone dust increased. These results are closely related to the packing density of the solid particles in the mortar. The effect was therefore estimated by introducing an optimum particle size distribution (PSD) model for maximum packing density. The PSD with a higher amount of stone dust was closer to the optimum PSD, and the optimization was quantified using RMSE. The improvement in the PSD by the stone dust was proven to affect the flowability, strength, and plastic viscosity based on several relevant analytical models. The reduction in yield stress is related to the increase of the average particle diameter when using stone dust.

이 연구에서는 고성능 시멘트 복합체의 잔골재 일부를 석분으로 대체하여 사용할 경우 재료의 성질 변화를 실험을 통해 살펴보았으며, 실험결과와 입도분포 특성과의 연관성을 여러 가지 모델들을 이용하여 분석하였다. 잔골재 중량 대비 0~30% 범위에서 석분을 치환한 시멘트 모르타르에 대해 유동성, 레올로지 특성, 강도 시험을 실시하였으며, 그 결과 석분 사용량이 증가함에 따라 유동성이 향상되고, 레올로지 정수(항복응력 및 소성점도)값이 감소하며, 압축강도 및 휨인장강도가 향상되는 것으로 나타났다. 이와 같은 실험결과는 모르타르를 구성하는 고체 입자들의 충전밀도와 밀접한 관련이 있으므로 최대 충전밀도를 얻기 위한 최적 입도분포 모델을 이용하여 그 영향을 분석하였다. 석분 사용량이 증가함에 따라 입자들의 입도분포가 최대 충전밀도를 얻기 위한 최적 입도분포에 더 가까워짐을 확인할 수 있었으며, 평균제곱근 오차를 이용하여 정량적으로 최적화 정도를 비교하였다. 석분 사용을 통한 입도분포 개선이 유동성의 향상과 소성점도의 감소, 그리고 강도의 향상에 미치는 영향은 관련한 여러 모델들을 이용하여 제시하였으며, 항복응력의 감소는 석분 사용에 따른 평균입경 크기의 증가와 관련이 있음을 보였다.

Keywords

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