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Studies on enhanced thermally stable high strength concrete incorporating silica nanoparticles
Graphical abstractSurface textural and morphological presentation of control HSC and SNPs specimens after exposure to 400°C.
HighlightsThermal degradation in SNPs-HSC specimens is delayed as compared to the control HSC specimens.Microstructural changes revealed that SNPs-HSC specimens have a stable microstructure up to a temperature of 400°C.The strength of SNPs-HSC specimens has increased significantly up to 400°C unlike the control HSC specimens.The elastic modulus of SNPs-HSC specimens was higher than that of control HSC specimens even up to 600°C.
AbstractThe performance of silica nanoparticles incorporated high strength concrete (SNPs-HSC) has been evaluated under elevated temperature conditions by exposing up to 800°C, followed by cooling to ambient temperature before performing experiments. Time-temperature studies revealed that incorporation of silica nanoparticles (SNPs) in concrete mix delays the heat transfer by 11%, 18%, 22% and 15% at 200°C, 400°C, 600°C and 800°C respectively thereby, decreasing the rate of degradation as compared to the conventional high strength concrete (HSC). A reduction in weight loss was observed in SNPs-HSC specimens after exposure to 200°C, 600°C, and 800°C; whereas at 400°C the weight loss quantity was ∼3.5% higher than the control HSC specimens due to the evaporation of water from calcium silicate hydrate (C-S-H) gel. On exposure up to 400°C for 2h, the compressive strength and split-tensile strength increased by 40% and 13% respectively, for SNPs-HSC specimens, whereas in control HSC specimen’s strength didn’t increase after 200°C. A higher residual compressive (7%) and split-tensile strength (8%) was found to be in SNPs-HSC specimens exposed to 800°C for 2h as compared to the control HSC specimens. The stress-strain curves revealed that SNPs-HSC specimens exhibits brittle failure up to 600°C whereas in control HSC brittle failure was observed only up to 400°C. Microstructural studies performed on the samples taken from the core of the 400°C exposed SNPs-HSC revealed the formation of higher C-S-H content and lower amount of calcium hydroxide (CH) leading to their enhanced mechanical and thermal stability.
Studies on enhanced thermally stable high strength concrete incorporating silica nanoparticles
Graphical abstractSurface textural and morphological presentation of control HSC and SNPs specimens after exposure to 400°C.
HighlightsThermal degradation in SNPs-HSC specimens is delayed as compared to the control HSC specimens.Microstructural changes revealed that SNPs-HSC specimens have a stable microstructure up to a temperature of 400°C.The strength of SNPs-HSC specimens has increased significantly up to 400°C unlike the control HSC specimens.The elastic modulus of SNPs-HSC specimens was higher than that of control HSC specimens even up to 600°C.
AbstractThe performance of silica nanoparticles incorporated high strength concrete (SNPs-HSC) has been evaluated under elevated temperature conditions by exposing up to 800°C, followed by cooling to ambient temperature before performing experiments. Time-temperature studies revealed that incorporation of silica nanoparticles (SNPs) in concrete mix delays the heat transfer by 11%, 18%, 22% and 15% at 200°C, 400°C, 600°C and 800°C respectively thereby, decreasing the rate of degradation as compared to the conventional high strength concrete (HSC). A reduction in weight loss was observed in SNPs-HSC specimens after exposure to 200°C, 600°C, and 800°C; whereas at 400°C the weight loss quantity was ∼3.5% higher than the control HSC specimens due to the evaporation of water from calcium silicate hydrate (C-S-H) gel. On exposure up to 400°C for 2h, the compressive strength and split-tensile strength increased by 40% and 13% respectively, for SNPs-HSC specimens, whereas in control HSC specimen’s strength didn’t increase after 200°C. A higher residual compressive (7%) and split-tensile strength (8%) was found to be in SNPs-HSC specimens exposed to 800°C for 2h as compared to the control HSC specimens. The stress-strain curves revealed that SNPs-HSC specimens exhibits brittle failure up to 600°C whereas in control HSC brittle failure was observed only up to 400°C. Microstructural studies performed on the samples taken from the core of the 400°C exposed SNPs-HSC revealed the formation of higher C-S-H content and lower amount of calcium hydroxide (CH) leading to their enhanced mechanical and thermal stability.
Studies on enhanced thermally stable high strength concrete incorporating silica nanoparticles
Kumar, R. (author) / Singh, S. (author) / Singh, L.P. (author)
Construction and Building Materials ; 153 ; 506-513
2017-07-04
8 pages
Article (Journal)
Electronic Resource
English
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