Microstructure Change of Nanosilica-Cement Composites Partially Exposed to Sulfate Attack

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 tha...

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Veröffentlicht in:International journal of concrete structures and materials Jg. 14; H. 3; S. 473 - 483
Hauptverfasser: Huang, Qian, Zhao, Liang, Zhao, Chenggong, Liu, Dongsheng, Wang, Chaoqiang
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Singapore 한국콘크리트학회 01.12.2020
Springer Singapore
Springer
Springer Nature B.V
SpringerOpen
Schlagworte:
Building Materials
Cement
cement composites
Composite materials
Crystallization
Diffraction
Engineering
Ettringite
Evaporation
Exposure
Gypsum
Microstructure
nanosilica
partial exposure
Solid Mechanics
Structural Materials
sulfate attack
Sulfate resistance
Sulfates
X-rays
토목공학
China
microstructure
nanosilica
cement composites
sulfate attack
partial exposure
ISSN:1976-0485, 2234-1315
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Zusammenfassung: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 resistance 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 within the 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 crystallization. Nanosilica–cement composites could be applied in real partial exposure environments containing sulfate ions.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:1976-0485
2234-1315
DOI:10.1186/s40069-020-00401-4