Advances in Measuring Air-Void Parameters in Hardened Concrete Using a Flatbed Scanner

2017 ◽  
Vol 45 (5) ◽  
pp. 20150424 ◽  
Author(s):  
Y. Song ◽  
R. Zou ◽  
D. I. Castaneda ◽  
K. A. Riding ◽  
D. A. Lange
Keyword(s):  
Hardened Concrete ◽  
Flatbed Scanner ◽  
Air Void

Hardened Concrete Air Void Analysis with a Flatbed Scanner

2001 ◽  
Vol 1775 (1) ◽  
pp. 36-43 ◽  
Author(s):  
Karl W. Peterson ◽  
Raymond A. Swartz ◽  
Lawrence L. Sutter ◽  
Thomas J. Van Dam
Keyword(s):  
Hardened Concrete ◽  
Flatbed Scanner ◽  
Air Void

Robust Test of the Flatbed Scanner for Air-Void Characterization in Hardened Concrete

2015 ◽  
Vol 44 (1) ◽  
pp. 20140432 ◽  
Author(s):  
Karl W. Peterson ◽  
Gerald C. Anzalone ◽  
Sona Nezami ◽  
Claire Yea Sol Oh ◽  
Haizhu Lu
Keyword(s):  
Hardened Concrete ◽  
Flatbed Scanner ◽  
Robust Test ◽  
Air Void

The Practical Application of a Flatbed Scanner for Air-Void Characterization of Hardened Concrete

2009 ◽  
Vol 6 (9) ◽  
pp. 102446 ◽  
Author(s):  
S. W. Dean ◽  
Karl Peterson ◽  
Lawrence Sutter ◽  
Mateusz Radlinski
Keyword(s):  
Hardened Concrete ◽  
Practical Application ◽  
Flatbed Scanner ◽  
Air Void

Influence of Air Content and Vibration Time on Frost Resistance of Air Entrained Concrete

2013 ◽  
Vol 857 ◽  
pp. 110-115 ◽  
Author(s):  
Xiu Hua Zheng ◽  
Yong Ge ◽  
Jie Yuan
Keyword(s):  
Frost Resistance ◽  
Hardened Concrete ◽  
Air Voids ◽  
Air Content ◽  
High Durability ◽  
Void Structure ◽  
Vibration Time ◽  
Air Void ◽  
Air Void Structure ◽  
Air Entrained Concrete

Air-entraining agent turely is one of the necessary compositions of the high durability concrete. The influence of air content and vibration time on the frost resistance of concrete was researched, and air void characteristics of hardened concrete was analysed. The results showed that the air contents could reduce the compressive strengthof hardened concrete excessively, but it made the spacing factor reduce obviously and significantly improve the frost resistance of concrete.The air voids with different structure in concrete were realized by vibration time. It was found that the air void structure and the frost resistance properties were influenced by the vibration time largely. The optimized vibration time is 30s, the appropriate vibration time is 20s~30s, no more than 35s.

Precision of the air void characteristics measurement by ASTM C 457: results of an interlaboratory test program

1996 ◽  
Vol 23 (5) ◽  
pp. 1118-1128 ◽  
Author(s):  
François Saucier ◽  
Richard Pleau ◽  
Daniel Vézina
Keyword(s):  
Test Method ◽  
Interlaboratory Study ◽  
Hardened Concrete ◽  
Probability Of Error ◽  
Air Content ◽  
Spacing Factor ◽  
Interlaboratory Test ◽  
Void System ◽  
Concrete Production ◽  
Air Void

Since 1993, the Quebec Department of Transportation requires all its concrete suppliers to demonstrate that their concrete satisfies the requirements of the CSA A23.1 standard as regards the maximum spacing factor of the air void system. This new requirement raises questions about the reproducibility of the ASTM C 457 test method. An interlaboratory study was carried out to verify if the variability of the test method is sufficiently low to allow reliable decisions on the acceptance or rejection of in-place hardened concrete. A total of 18 operators from 13 different laboratories microscopically examined the six concrete slabs used for the study. It is concluded that the average reproducibility coefficient of variation is 14.4% for the total air content measurement and 14.2% for the spacing factor measurement. Considering these results, the probability that the measured value of the spacing factor exceeds the mandatory limit of 230 μm on a concrete production containing an air void system with a spacing factor of 170 μm (the target value proposed in the CSA A23.1 M-94 standard) is less than 0.7% (a probability of error of about 1%, 5%, or 10% is typical of most quality control test methods). Key words: concrete, air content, air void measurement, spacing factor, ASTM C 457 standard, interlaboratory study, freeze–thaw durability.

Simulation of air-void system in hardened concrete using a geometrical model

2019 ◽  
Vol 71 (13) ◽  
pp. 680-689 ◽  
Author(s):  
Zhichao Liu ◽  
Will Hansen ◽  
Fazhou Wang ◽  
Wenqin Zhang
Keyword(s):  
Geometrical Model ◽  
Hardened Concrete ◽  
Void System ◽  
Air Void
Sign in / Sign up

Export Citation Format

Share Document