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Architecture & Urban Research Institute

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한국콘크리트학회|IJCSM 2020년 5월

논문명 Microstructure Change of Nanosilica Cement Composites Partially Exposed to Sulfate Attack
저자명 (Qian Huang) ; (Liang Zhao) ; (Chenggong Zhao) ; (Dongsheng Liu) ; (Chaoqiang Wang)
발행사 한국콘크리트학회
수록사항 IJCSM, Vol.14 No.3 (2020-05)
페이지 시작페이지(473) 총페이지(11)
ISSN 1976-0485
주제분류 재료 / 구조
주제어 ; nanosilica; cement composites; partial exposure; sulfate attack; microstructure
요약2 The deterioration of cement composites containing nanosilica partially exposed to sulfate attack was studied, and the microstructure change of the composites was analysed by a scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The results showed that nanosilica?cement composites had better sulfate resistance compared to plain cement composite under partial exposure to sulfate attack, and their sulfate resist-ance increased as the nanosilica content increased (in the range of 0 to 5 wt% replacing cement by weight). The main sulfate products were gypsum and ettringite within the surface and inner parts, respectively in both the immersed and evaporation portions of the nanosilica?cement composites, which was consistent with the plain cement composite. Thus, the incorporation of nanosilica did not change the distribution characteristics of the sulfate products withinthe composites partially exposed to sulfate attack. However, the addition of nanosilica reduced the amount of sulfate products in both the immersed and evaporation portions, and their amount decreased with the increase of nanosilica content. The evaporation portions of the composites suffered chemical sulfate attack rather than sulfate salt crystalliza-tion. Nanosilica?cement composites could be applied in real partial exposure environments containing sulfate ions.
소장처 한국콘크리트학회
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