Air void analyzer for plastic concrete.

Details

• Creators:
  Eggers, John
• Corporate Creators:
  Louisiana Transportation Research Center
• Corporate Contributors:
  Louisiana. Dept. of Transportation and Development ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Concrete plastic composites
  • Air content
  • Polymer concrete
  • Air voids
  • Concrete--Air content--Testing
  • Concrete construction
• Publication/ Report Number:
  FHWA/LA/08-436
• Resource Type:
  Tech Report
• Geographical Coverage:
  Louisiana
• Edition:
  Final report; Nov. 2005-Dec. 2007.
• Corporate Publisher:
  Louisiana Transportation Research Center
• Abstract:
  The two main test methods that measure the air content in plastic concrete are the pressure method and the volumetric ; or roll-a-meter method. Although these methods report the total air in the concrete, they do not distinguish between ; entrained air and entrapped air or the quality of the air void system. The quality of the air void system consists of the ; content, distribution, and size of the air bubbles in the concrete matrix. In order to analyze the quality of the air void ; system, a petrographic analysis is required on the hardened concrete. The downside of this procedure is that it requires ; analysis of hardened concrete under a microscope which is time consuming, expensive, and results are determined well ; after placement of the concrete. The air void analyzer (AVA) is a new device developed as an alternative to the ; petrographic method that promises to provide air void system properties in a more timely matter while the concrete is ; still in the plastic stage. ; The intent of this research was to first, evaluate the air void analyzer and compare results with the petrographic ; method to verify its results. Secondly, it was to correlate the use of various types of water reducing admixtures ; (WRA) with various types of air entraining admixtures (AEA) into a generalized declaration that would state ; which WRA and AEA is good at developing a quality air void system in concrete. In the initial course of this ; investigation, the AVA demonstrated it was incapable of reliably reproducing results from the same batch of ; concrete about 60 percent of the time. It was decided to end this study. This report presents the study findings.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/16559/dot_16559_DS1.pdf
• File Type:
  [PDF - 277.03 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:fc3b0b960b9a5190b4de8277044c300ce9af5e0713772490e786982e08a16e79