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논문 기본 정보

자료유형
학술저널
저자정보
Dongyeop Han (Gyeongsang National University) Jae Hong Kim (Ulsan National Institute of Science and Technology) Jin Hyun Lee (Ulsan National Institute of Science and Technology) Su-Tae Kang (Daegu University)
저널정보
한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.11 No.4
발행연도
2017.12
수록면
627 - 635 (9page)

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초록· 키워드

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The aim of this research was to investigate the validity of the Krieger-Dougherty model as a quantitative model to predict the viscosity of mortar depending on various aggregate sizes. The Krieger-Dougherty model reportedly predicted the viscosity of a suspension, which includes cement-based materials. Concrete or mortar incorporates natural resources, such as sand and gravel, referred to as aggregates, which can make up as much as 80% of the mixture by volume. Cement paste is a suspending medium at fresh state and then becomes a binder to link the aggregate after its hydration. Both the viscosity of the suspending medium and the characteristics of the aggregates, therefore, control the viscosity of the cement-based materials. In this research, various sizes and gradations of fine aggregate samples were prepared. Workability and rheological properties were measured using fresh-state mortar samples and incorporating the various-sized fine aggregates. Yield stress and viscosity measurements were obtained by using a rheometer. Based on the packing density of each fine aggregate sample, the viscosity of the mortar was predicted with the Krieger-Dougherty model. In addition, further adjustments were made to determine the water absorption of fine aggregates and was transferred from successful experiment to simulation for more accurate prediction. It was also determined that both yield stress and viscosity increase when the fine aggregate mean size decreases throughout the mix. However, when the mean size of the fine aggregates is bigger than 0.7 mm, the yield stress is not affected by the size of the fine aggregate. Additionally, if aggregate grains get smaller up to 0.3 mm, their water absorption is critical to the rheological behavior.
#mortar #rheology #viscosity #fine aggregate #grain size #Krieger-Dougherty equation

목차

Abstract
1. Introduction
2. Materials and Sample Preparation
3. Tests Results
4. Discussion
5. Conclusions
References

참고문헌 (63)

참고문헌 신청
ASTM International. (2006). ASTM C136, standard test method for sieve analysis of fine and coarse aggregate. West Conshohocken, PA: ASTM International. doi:10.1520/C0136. ASTM International. (2010). ASTM C1611, standard test method for slump flow of self-consolidating concrete. West Conshohocken: ASTM International. ASTM International. (2012). ASTM C150, standard specification for Portland cement. West Conshohocken: ASTM International. ASTM International. (2015). ASTM C128, standard test method for density, relative density (specific gravity) and absorption of fine aggregate. West Conshohocken, PA: ASTM International. doi:10.1520/C0128-15.2. Bairagi, N., Vidyadhara, H., & Ravande, K. (1990). Mix design procedure for recycled aggregate concrete. Construction and Building Materials, 4, 188?193.

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