Effect of nano-SiO2/CaSO4 whisker–silica fume on the strength, drying shrinkage, and capillary water absorption of cement mortar

To compensate for the defects of silica fume (SF), which aggravates drying shrinkage, and increase the strength and durability of cement mortar, it was modified using 1 wt% nanosilica (NS) or calcium sulfate whisker (CSW) compounded with 2 wt% SF. The strength, volume stability, and durability of th...

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Bibliographic Details
Published in:Archives of Civil and Mechanical Engineering 2023-12, Vol.24 (1), p.13, Article 13
Main Authors: Wang, Han, Zeng, Xiaohui, Liu, Zhiru, Luan, Shuoxing, Tang, Zhuo, Long, Guangcheng, Tan, Qingquan, Wang, Haixu, Liu, Suihu, Ren, Xin, Ma, Gang, Lan, Xuli
Format: Article
Language:English
Subjects:
Calcium aluminate
Calcium compounds
Calcium sulfate
Cement
Civil Engineering
Compressive strength
Construction
Drying
Durability
Energy consumption
Engineering
Gels
Hydrates
Mechanical Engineering
Mechanical properties
Mortars (material)
Nanomaterials
Original Article
Particle size
Physical properties
Porosity
Raw materials
Silica fume
Silicon dioxide
Solid phases
Structural Materials
Thermogravimetry
Water absorption
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Summary:To compensate for the defects of silica fume (SF), which aggravates drying shrinkage, and increase the strength and durability of cement mortar, it was modified using 1 wt% nanosilica (NS) or calcium sulfate whisker (CSW) compounded with 2 wt% SF. The strength, volume stability, and durability of the cement mortar were characterized using the compressive strength, drying shrinkage, and capillary water absorption. The physical composition and microstructure of the samples are discussed in detail based on thermogravimetry, mercury intrusion porosimetry, and scanning electron microscopy measurements. The combination of SF and NS increased the generation of C–S–H gels and reduced the total porosity, thus increasing the early strength of the cement mortar and decreasing the capillary water absorption. Notably, on combining SF and CSW, additional calcium aluminate hydrates (AFts) were generated, and the mesoporosity (10–50 nm) was reduced. The fibrous AFt phase increased the later strength of the cement mortar, and the presence of additional AFt increased the solid phase volume, which compensated for the drying shrinkage.
ISSN:1644-9665
2083-3318
1644-9665
DOI:10.1007/s43452-023-00806-4