Preparation of shotcrete coarse aggregate with low grade clay and coal ash (저급 점토와 석탄회를 이용한 숏크리트용 골재의 제조)

Kyung-Nam Kim (김경남); 정희수; Hyun Park (박현)

Preparation of shotcrete coarse aggregate with low grade clay and coal ash

Journal of the Korean Crystal Growth and Crystal Technology
Abbr : J. Korean Cryst. Growth Cryst. Technol.
2010, 20(3), pp.147-152
Publisher : The Korea Association Of Crystal Growth, Inc.
Research Area : Engineering > Materials Science and Engineering

Kyung-Nam Kim ¹, 정희수 ², Hyun Park ¹

¹강원대학교
²강원대학교 신소재공학과

Accredited

ABSTRACT

In this study, the artificial coarse aggregate was manufactured by using coal ash and low grade clay. The characteristics of a coal ash-clay system were investigated using XRD, XRF, TG-DTA, SEM and Dilatometer with various coal ash contents. The chemical compositions are the fly ash, bottom ash and clay, Al2O3 are 28.5 wt%, 32.4 wt% and 18.1 wt%, and SiO2 are 33.0 wt%, 53.7 wt% and 68.4 wt% in weight ratio, respectively. The shrinkage of specimens started at around 850oC and changed little up to 1100oC, but increased markedly at above 1100oC. The shrinkage rate is strongly related to the decarbonization amount of coal ash. At the sintering temperature 1150oC, it was found that quartz, mullite,anorthite and albite phase exist in all specimens. It was found that bottom-clay system specimen sintered at 1150oC had a good compressive strength of 87.5 kg/cm 2, and the compressive strength of bottom-clay specimen was higher than that of fly-clay system specimen. The reusability of coal ash as a raw material in the process of shotcrete resources such as artifical coarse aggregate is highly expected.

KEYWORDS

Clay, Coal ash, Aggregate, Shotcrete

Citation status

* References for papers published after 2023 are currently being built.

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Journal of the Korean Crystal Growth and Crystal Technology 2023 KCI Impact Factor : 0.19