Rayleigh surface waves for characterization of the air void system in fresh concrete

2010 ◽  
Author(s):  
Cliff J. Lissenden ◽  
Ronald B. Then ◽  
Sheng Li ◽  
Chao Xiao ◽  
Maria Lopez de Murphy ◽  
...  
Keyword(s):  
Surface Waves ◽  
Fresh Concrete ◽  
Rayleigh Surface Waves ◽  
Void System ◽  
Air Void

Characterization of fatigue damage in A36 steel specimens using nonlinear rayleigh surface waves

2012 ◽  
Author(s):  
Simon V. Walker ◽  
Jin-Yeon Kim ◽  
Laurence J. Jacobs ◽  
Jianmin Qu
Keyword(s):  
Surface Waves ◽  
Fatigue Damage ◽  
Rayleigh Surface Waves ◽  
A36 Steel

Béton produit en bétonnière mobile et en usine conventionnelle : comparaison des caractéristiques du réseau de bulles d'air

1988 ◽  
Vol 15 (3) ◽  
pp. 306-314
Author(s):  
Gaston Larose ◽  
Michel Pigeon
Keyword(s):  
Key Words ◽  
Laboratory Tests ◽  
Fresh Concrete ◽  
Mobile Unit ◽  
Freeze Thaw ◽  
Air Content ◽  
Spacing Factor ◽  
Void System ◽  
Concrete Mixer ◽  
Air Void

The durability of concrete to freeze-thaw cycles is dependent upon the existence of an adequate air-void system. There are very few studies on the air-void system of field concretes. Laboratory tests have proven that the air content measurement on the fresh concrete is not sufficient to judge the aptitude of the air-void system to protect the concrete from frost damage.This paper is a comparison of the air-void systems of field concretes produced in either a conventional plant or a mobile unit the use of which is becoming more and more frequent. The concretes produced in the conventional plant generally had sufficient air-void systems for air contents in the usual range (5–7%). The mobile unit showed that a slightly higher air content (8%) was needed to produce an adequate air-void system. Key words: concrete, mobile concrete-mixer, air-void systems, air-entraining agent, spacing factor, surface area, air content.

scholarly journals Air-Void System Characterization of Eco-Cellular Concretes

2021 ◽  
Vol 33 (5) ◽  
pp. 04021088
Author(s):  
Alba Font ◽  
María Victoria Borrachero ◽  
Lourdes Soriano ◽  
José Monzó ◽  
Jordi Payá
Keyword(s):  
Void System ◽  
System Characterization ◽  
Air Void

Impact of Concrete Placing Method on Air Content, Air-Void System Parameters, and Freeze-Thaw Durability

1996 ◽  
Vol 1532 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Kenneth C. Hover ◽  
Roger J. Phares
Keyword(s):  
Fresh Concrete ◽  
Free Fall ◽  
Hardened Concrete ◽  
Freezing And Thawing ◽  
Freeze Thaw ◽  
System Parameters ◽  
Air Content ◽  
Void System ◽  
Parking Lot ◽  
Air Void

Approximately 76 m3 (100 yd3) of ready-mixed, air-entrained concrete were placed in a parking lot and driveway at the Schwing America Manufacturing facility in White Bear, Minnesota, on June 21, 1994. This concrete was placed by means of a pump, crane and bucket, and truck-mounted conveyor, and came directly from the chute of ready-mix trucks. Pump configurations were used that allowed unrestricted free-fall of the concrete; a kink in the rubber hose at the end of the line created a slight back pressure and slowed the descent of the concrete. After placement, the concrete was consolidated by an immersion vibrator in some locations and struck off with no further consolidation in other locations. Air content of the fresh concrete was measured by ASTM C231 pressure meters at the truck chutes and at the point of placement. Air content and air-void system parameters of the hardened concrete were determined in accordance with ASTM C457. Actual freeze-thaw performance was evaluated by ASTM C666 for concrete sampled from the truck chute and sampled from the pavement after placement by the various methods. Twenty-four tests of the air content of concrete from six successive truckloads of concrete showed that the variation in truck-to-truck air content was frequently greater than the within-truck variation because of different methods of handling the concrete. Tests of the fresh concrete after pumping, conveying, chuting, and free-fall from the concrete bucket showed reduced air content. From analysis of the hardened concrete, it was observed that the air bubbles remaining in the pumped concrete were smaller than in the concrete as delivered. The air-void spacing factor was not significantly altered by pumping. In ASTM C666 freezing and thawing tests, the specimen experiencing the greatest loss of air content as a result of pumping was determined to have the lowest total air content of all specimens tested (before vibration), yet had the highest durability of all specimens tested.

Super Air Meter for Assessing Air-Void System of Fresh Concrete

2016 ◽  
Vol 5 (2) ◽  
pp. 20150009 ◽  
Author(s):  
J. Tanesi ◽  
H. Kim ◽  
M. Beyene ◽  
A. Ardani
Keyword(s):  
Fresh Concrete ◽  
Void System ◽  
Air Void

Characterization of ultrasonic Rayleigh surface waves in asphaltic concrete

2009 ◽  
Vol 42 (7) ◽  
pp. 610-617 ◽  
Author(s):  
Chi-Won In ◽  
Jin-Yeon Kim ◽  
Kimberly E. Kurtis ◽  
Laurence J. Jacobs
Keyword(s):  
Surface Waves ◽  
Asphaltic Concrete ◽  
Rayleigh Surface Waves

Characterization of stress corrosion cracking in carbon steel using nonlinear Rayleigh surface waves

2014 ◽  
Vol 62 ◽  
pp. 144-152 ◽  
Author(s):  
Daniel T. Zeitvogel ◽  
Kathryn H. Matlack ◽  
Jin-Yeon Kim ◽  
Laurence J. Jacobs ◽  
Preet M. Singh ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Surface Waves ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Rayleigh Surface Waves

CHARACTERIZATION OF DISPERSIVE ULTRASONIC RAYLEIGH SURFACE WAVES IN ASPHALT CONCRETE

2008 ◽  
Author(s):  
Chi-Won In ◽  
Jin-Yeon Kim ◽  
Laurence J. Jacobs ◽  
Kimberly E. Kurtis ◽  
Donald O. Thompson ◽  
...  
Keyword(s):  
Surface Waves ◽  
Asphalt Concrete ◽  
Rayleigh Surface Waves
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