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Impact of Nanosilica Size and Surface Area on Concrete Properties.(TECHNICAL PAPER)

In this work, the impact of nanosilica particles in grouts and concrete samples were measured to identify the change to temperature of cement hydration, strength, and permeability. The compressive strength and modulus of elasticity were also evaluated as a means to understand the impact that the nan... Full description

Journal Title: ACI Materials Journal 2015, Vol.112(3), p.419(9)
Main Author: Belkowitz, Jon S.
Other Authors: Belkowitz, Whitneyle B. , Nawrocki, Kamil , Fisher, Frank T.
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0889-325X ; DOI: 10.14359/51687397
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recordid: gale_ofa558678902
title: Impact of Nanosilica Size and Surface Area on Concrete Properties.(TECHNICAL PAPER)
format: Article
creator:
  • Belkowitz, Jon S.
  • Belkowitz, Whitneyle B.
  • Nawrocki, Kamil
  • Fisher, Frank T.
subjects:
  • Permeability – Electric Properties
  • Concretes – Electric Properties
  • Silicon Dioxide – Electric Properties
ispartof: ACI Materials Journal, 2015, Vol.112(3), p.419(9)
description: In this work, the impact of nanosilica particles in grouts and concrete samples were measured to identify the change to temperature of cement hydration, strength, and permeability. The compressive strength and modulus of elasticity were also evaluated as a means to understand the impact that the nanosilica size and surface area had on the macroscopic properties traditionally used in the concrete industry. Finally, electrical resistivity was measured as a means to understand how the pore connectivity and permeability of the concrete specimens were manipulated by nanosilica addition. Three types of nanosilica dispersions were added to cement composites and examined over short and long curing times. All three different-sized nanoparticles were added to have an equal surface area of silica. The larger particles exhibited higher levels of enhancement on the cement composite, showing increased compressive strength and modulus of elasticity by more than 20% over the reference mixtures. The smallest nanosilica particle exhibited a 20% increase in compressive strength at its lowest dosages and a 14% reduction in compressive strength at its highest dosage. These results illustrate a limitation when using the smallest nanosilica particle. Finally, the addition of all nanosilica particles proved to increase the electrical resistivity of the concrete by 30% for the smallest nanosilica particles and 700% for the largest nanosilica particle. This increase could be attributed to a reduction in permeability from a denser concrete specimen. Keywords: bulk electrical resistivity; compressive strength; modulus of elasticity; nanosilica; semi-adiabatic temperature curve.
language: eng
source:
identifier: ISSN: 0889-325X ; DOI: 10.14359/51687397
fulltext: fulltext
issn:
  • 0889-325X
  • 0889325X
url: Link


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titleImpact of Nanosilica Size and Surface Area on Concrete Properties.(TECHNICAL PAPER)
creatorBelkowitz, Jon S. ; Belkowitz, Whitneyle B. ; Nawrocki, Kamil ; Fisher, Frank T.
ispartofACI Materials Journal, 2015, Vol.112(3), p.419(9)
identifierISSN: 0889-325X ; DOI: 10.14359/51687397
subjectPermeability – Electric Properties ; Concretes – Electric Properties ; Silicon Dioxide – Electric Properties
descriptionIn this work, the impact of nanosilica particles in grouts and concrete samples were measured to identify the change to temperature of cement hydration, strength, and permeability. The compressive strength and modulus of elasticity were also evaluated as a means to understand the impact that the nanosilica size and surface area had on the macroscopic properties traditionally used in the concrete industry. Finally, electrical resistivity was measured as a means to understand how the pore connectivity and permeability of the concrete specimens were manipulated by nanosilica addition. Three types of nanosilica dispersions were added to cement composites and examined over short and long curing times. All three different-sized nanoparticles were added to have an equal surface area of silica. The larger particles exhibited higher levels of enhancement on the cement composite, showing increased compressive strength and modulus of elasticity by more than 20% over the reference mixtures. The smallest nanosilica particle exhibited a 20% increase in compressive strength at its lowest dosages and a 14% reduction in compressive strength at its highest dosage. These results illustrate a limitation when using the smallest nanosilica particle. Finally, the addition of all nanosilica particles proved to increase the electrical resistivity of the concrete by 30% for the smallest nanosilica particles and 700% for the largest nanosilica particle. This increase could be attributed to a reduction in permeability from a denser concrete specimen. Keywords: bulk electrical resistivity; compressive strength; modulus of elasticity; nanosilica; semi-adiabatic temperature curve.
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titleImpact of Nanosilica Size and Surface Area on Concrete Properties.(TECHNICAL PAPER)
descriptionIn this work, the impact of nanosilica particles in grouts and concrete samples were measured to identify the change to temperature of cement hydration, strength, and permeability. The compressive strength and modulus of elasticity were also evaluated as a means to understand the impact that the nanosilica size and surface area had on the macroscopic properties traditionally used in the concrete industry. Finally, electrical resistivity was measured as a means to understand how the pore connectivity and permeability of the concrete specimens were manipulated by nanosilica addition. Three types of nanosilica dispersions were added to cement composites and examined over short and long curing times. All three different-sized nanoparticles were added to have an equal surface area of silica. The larger particles exhibited higher levels of enhancement on the cement composite, showing increased compressive strength and modulus of elasticity by more than 20% over the reference mixtures. The smallest nanosilica particle exhibited a 20% increase in compressive strength at its lowest dosages and a 14% reduction in compressive strength at its highest dosage. These results illustrate a limitation when using the smallest nanosilica particle. Finally, the addition of all nanosilica particles proved to increase the electrical resistivity of the concrete by 30% for the smallest nanosilica particles and 700% for the largest nanosilica particle. This increase could be attributed to a reduction in permeability from a denser concrete specimen. Keywords: bulk electrical resistivity; compressive strength; modulus of elasticity; nanosilica; semi-adiabatic temperature curve.
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abstractIn this work, the impact of nanosilica particles in grouts and concrete samples were measured to identify the change to temperature of cement hydration, strength, and permeability. The compressive strength and modulus of elasticity were also evaluated as a means to understand the impact that the nanosilica size and surface area had on the macroscopic properties traditionally used in the concrete industry. Finally, electrical resistivity was measured as a means to understand how the pore connectivity and permeability of the concrete specimens were manipulated by nanosilica addition. Three types of nanosilica dispersions were added to cement composites and examined over short and long curing times. All three different-sized nanoparticles were added to have an equal surface area of silica. The larger particles exhibited higher levels of enhancement on the cement composite, showing increased compressive strength and modulus of elasticity by more than 20% over the reference mixtures. The smallest nanosilica particle exhibited a 20% increase in compressive strength at its lowest dosages and a 14% reduction in compressive strength at its highest dosage. These results illustrate a limitation when using the smallest nanosilica particle. Finally, the addition of all nanosilica particles proved to increase the electrical resistivity of the concrete by 30% for the smallest nanosilica particles and 700% for the largest nanosilica particle. This increase could be attributed to a reduction in permeability from a denser concrete specimen. Keywords: bulk electrical resistivity; compressive strength; modulus of elasticity; nanosilica; semi-adiabatic temperature curve.
pubAmerican Concrete Institute
doi10.14359/51687397
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pages419-427
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date2015-05-01