Results 311 to 320 of about 147,317 (357)
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Air Void Characterization in Sand-Sulfur-Bitumen Mixes
Journal of Materials in Civil Engineering, 2019AbstractThis paper represents an attempt to study the internal structure of sand-sulfur-bitumen (SSB) mixes with the help of effective and quick three-dimensional (3D), high-resolution technology s...
Subhashree Jena +2 more
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Air-Void Stability in Self-Consolidating Concrete
ACI Materials Journal, 2002Ensuring an adequate air-void system in concrete is essential to obtain proper resistance to freezing/thawing and deicer scaling. With increasing usage of highly flowable and self-consolidating concretes, it is important to ensure that these concretes can secure a proper air-void system that remains stable during agitation, placement, and setting. This
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Air voids size distribution determined by ultrasonic attenuation
Construction and Building Materials, 2013Abstract Voids in cement-based materials influence their material properties. While air voids within a certain range are beneficial for freezing-and-thawing resistance, large-size voids decreases strength and durability. This paper proposes a method to quantify the air voids size distribution, which use the concept of ultrasonic wave attenuation. The
Yim, HJ Yim, Hong-Jae +3 more
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Density Tests Above Zero Air Voids Line
Journal of Geotechnical Engineering, 1989TO compute the degree of saturation, S, one must have the results from tests for water content, wet unit weight, and specific gravity. Each has inherent variability, which results in a variability in S. This variability results in a percentage of S plotting above the zero air voids line (ZAVL).
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Theory of discharges in air-filled insulation voids
11th International Symposium on High-Voltage Engineering (ISH 99), 1999An initial seed electron, in an air-filled void in an insulator, is followed until a Gaussian shaped electron avalanche is formed that eventually distorts the electric field to form both cathode and anode directed streamers. The crucial role of photoionisation in the three-dimensional formation of a streamer discharge in a void, is demonstrated by ...
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A Numerical Test of Air Void Spacing Equations
Advanced Cement Based Materials, 1998Abstract Air void spacing equations have been proposed in the literature by a number of authors: Powers; Philleo; Attiogbe; and Pleau and Pigeon. Each proposed spacing equation attempts to characterize the true “spacing” of entrained air voids in concrete.
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Characterization of Entrained Air Voids Using Scattered Ultrasound
AIP Conference Proceedings, 2006The passage of ultrasound waves through highly heterogeneous media (e.g. hardened cement pastes that contain entrained air voids for protection against damage during freeze‐thaw cycles) leads to significant loss of wave energy and an apparent attenuation of ultrasonic signal emerging from the heterogeneous zone.
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Mean Spacing of Air Voids in Hardened Concrete
ACI Materials Journal, 1993In this study geometric probability concepts and stereological principles are used to derive an equation for the mean spacing of air voids in hardened concrete. The equation is presented and it is shown that the input paramerers for the equation are the same as those obtained from the standard air-void system analysis of hardened concrete. The equation
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Air-void optimization of self compacting concrete
2021 7th International Conference on Hydraulic and Civil Engineering & Smart Water Conservancy and Intelligent Disaster Reduction Forum (ICHCE & SWIDR), 2021Ji Zhang +5 more
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