slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
“Old Wooden Bridge” Bridge to No Name Key from Big Pine Key, Florida PowerPoint Presentation
Download Presentation
“Old Wooden Bridge” Bridge to No Name Key from Big Pine Key, Florida

Loading in 2 Seconds...

play fullscreen
1 / 28

“Old Wooden Bridge” Bridge to No Name Key from Big Pine Key, Florida - PowerPoint PPT Presentation


  • 64 Views
  • Uploaded on

“Old Wooden Bridge” Bridge to No Name Key from Big Pine Key, Florida. Precision Statements for the Surface Resistivity of Water Cured Concrete Cylinders in the Laboratory. by Mike Jackson for Mario Paredes. Sponsors.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about '“Old Wooden Bridge” Bridge to No Name Key from Big Pine Key, Florida' - nasnan


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide2

Precision Statements for the Surface Resistivity of Water Cured Concrete Cylinders in the Laboratory

by

Mike Jackson for

Mario Paredes

sponsors
Sponsors
  • American Association of State Highway and Transportation Officials (AASHTO);
  • Technology Implementation Group (TIG);
  • Florida Department of Transportation;
  • TRB Committee AFN30 – Durability of Concrete.
participants
Participants
  • California Department of Transportation;
  • Colorado Department of Transportation;
  • Federal Highway Administration;
  • Florida Department of Transportation;
  • Florida Atlantic University;
  • Grupo Carmelo, Puerto Rico;
  • Indiana Department of Transportation;
  • McGill University;
participants continued
Participants (Continued)
  • Nebraska Department of Transportation;
  • New York Department of Transportation;
  • Puerto Rico Highways and Transportation Authority;
  • Purdue University;
  • Titan America –Tarmac;
  • The University of North Florida; and
  • Virginia Department of Transportation.
round robin testing program
Round-Robin Testing Program
  • ASTM Designation C802, “Standard Practice for Conducting an Interlaboratory Test Program to Determine the Precision of Test Methods for Construction Materials.”
  • AASHTO Designation: TP95-11, “Standard Method of Test for Surface Resistivity Indication of Concrete’s Ability to Resist Chloride Ion Penetration2.”
round robin testing program1
Round-Robin Testing Program
  • Fourteen (14) different laboratories;
  • Twelve (12) different concrete mixtures;
  • Wide range of constituent materials; and
  • Two (2) different commercial SR meters:
    • CNS Farnell Ltd.
    • Proceq SA.
concrete mix constituents1
Concrete Mix Constituents
  • Mix w/cm ratios ranged from 0.30 - 0.41;
  • Ten of the12 mixes contained fly ash;
  • One mix contained no granular admixtures;
  • One mix contained 25% slag;
  • One mix contained 10% meta-kaolin; and
  • Two mixes contained 4% - 6% silica fume.
test samples
Test Samples
  • Hardened 4-in. diameter by 8-in. long cylindrical concrete specimens were tested;
  • Test specimens were fabricated by 12 of the participating labs, and shipped to all participants for SR testing;
  • SR was measured in accordance with AASHTO Designation: TP95-11 after 28, 56, and 91 days of standard laboratory curing.
sample packaging
Sample Packaging
  • After 2 weeks of curing in lime saturated water, specimens were wrapped and sealed to avoid loss of moisture during shipping.
sample shipping
Sample Shipping
  • The specimens were then carefully packaged for 2nd Day shipping to avoid damage and/or drying during shipping.
surface resistivity testing
Surface Resistivity Testing
  • SR was then measured after 28, 56, and 91 days of standard laboratory curing.
mean sr at 28 days
Mean SR at 28 Days

Note: Data shaded in yellow determined to be statistical stragglers by Mandel’s k-statistic.

std dev at 28 days
Std. Dev. at 28 Days

Note: Data shaded in yellow determined to be statistical stragglers by Mandel’s k-statistic.

precision calculations at 28 days
Precision Calculationsat 28 Days

Note: Lab #7 Data Removed Based on Mandel’s h-statistic.

proposed precision statements
Proposed Precision Statements
  • Single-Operator Precision – The results of two properly conducted tests by the same operator on concrete samples from the same batch and of the same diameter should not differ by more than 12.1% of their average.
  • Multilaboratory Precision – The results of two properly conducted tests in different laboratories on the same material should not differ by more than 32.5% of their average.
  • Bias - This procedure has no measurable bias.
slide28

Paper Published in the Journal of ASTM International, Paper ID #JAI104268-11, “Precision Statements for the Surface Resistivity of Water Cured Concrete Cylinders in the Laboratory.”