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Title |
Hydration and Mechanical Properties of High-volume Fly Ash Concrete with Nano-silica
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Authors |
차수원(Soo-Won Cha) ; 이건욱(Geon-Wook Lee) ; 최영철(Young-Cheol Choi) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.6.112 |
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Keywords |
나노 실리카; 플라이애시; HVFC; 시멘트복합체; 충진효과; 미세구조 Nano silica; Fly ash; HVFC; Cement composite; Filler effect; Microstructure |
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Abstract |
Recently, as carbon neutrality has been important factor in the construction industry, many studies have been conducted on the high-volumefly ash concrete. High volume fly ash concrete(HVFC) is usually made by replacing more than 50% of cement with fly ash. However, HVFC has adisadvantage of low compressive strength in early age. To overcome this shortcoming of HVFC, improve this, interest in techonolgy using nanomaterialsis increasing. Nano silica is expected to improve the early age strength of HVFC as a pozzolanic material. This study investigated the effect of nanosilica on the early hydration reaction and microstructure of HVFC. The early hydration reaction of HFVC was analyzed through setting time, isothermalcalorimeter, compressive strength and thermal weight analysis. In addition, the microstructure of HVFC was measured by mercury intrusionporosimetry. From the test results, it was confirmed that nano silica increased the early age strength and improve the microstructure of HVFC.
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