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Preparation and piezoresistive properties of carbon fiber-reinforced alkali-activated fly ash/slag mortar
Highlights CF-AAFS mortars exhibited good workability and high strength. The percolation threshold for CF-AAFS is 0.2 vol%. CF-AAFS mortar with 0.1 vol% carbon fiber showed high sensitivity and repeatability. CF-AAFS is a promising material in the use of self-sensing structure in construction.
Abstract In this study, a novel type of conductive mortar was proposed and prepared by alkali-activated fly ash/slag (AAFS) combined with carbon fibers. The workability, mechanical properties, electrical resistivity and piezoresistive properties of carbon fiber-reinforced AAFS (CF-AAFS) mortar were investigated and compared with carbon fiber-reinforced cement mortar (CF-CM). It was found that CF-AAFS exhibited much better workability and significantly higher compressive strength (>66 MPa at 28 days) than CF-CM with the same carbon fiber content. With 0.2 vol% carbon fibers, the electrical resistivity of CF-AAFS mortar decreased from 3313 Ω·cm to 165 Ω·cm at 28 days, reaching the percolation threshold. AAFS mortar with only 0.1 vol% carbon fiber content exhibited good piezoresistivity under both monotonic and cyclic compression. Therefore, CF-AAFS was regarded as a promising material in the use of self-sensing structure in construction.
Preparation and piezoresistive properties of carbon fiber-reinforced alkali-activated fly ash/slag mortar
Highlights CF-AAFS mortars exhibited good workability and high strength. The percolation threshold for CF-AAFS is 0.2 vol%. CF-AAFS mortar with 0.1 vol% carbon fiber showed high sensitivity and repeatability. CF-AAFS is a promising material in the use of self-sensing structure in construction.
Abstract In this study, a novel type of conductive mortar was proposed and prepared by alkali-activated fly ash/slag (AAFS) combined with carbon fibers. The workability, mechanical properties, electrical resistivity and piezoresistive properties of carbon fiber-reinforced AAFS (CF-AAFS) mortar were investigated and compared with carbon fiber-reinforced cement mortar (CF-CM). It was found that CF-AAFS exhibited much better workability and significantly higher compressive strength (>66 MPa at 28 days) than CF-CM with the same carbon fiber content. With 0.2 vol% carbon fibers, the electrical resistivity of CF-AAFS mortar decreased from 3313 Ω·cm to 165 Ω·cm at 28 days, reaching the percolation threshold. AAFS mortar with only 0.1 vol% carbon fiber content exhibited good piezoresistivity under both monotonic and cyclic compression. Therefore, CF-AAFS was regarded as a promising material in the use of self-sensing structure in construction.
Preparation and piezoresistive properties of carbon fiber-reinforced alkali-activated fly ash/slag mortar
Construction and Building Materials ; 222 ; 738-749
2019-06-17
12 pages
Article (Journal)
Electronic Resource
English
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