Characterizing KDOT's Chloride Permeability Testing Protocol: Reducing the Duration of the Rapid Chloride Permeability Test

Reliable and economical design of Portland cement concrete (PCC) pavement structural systems relies on various factors among which proper characterization of the expected permeability response. Permeability is an extremely important factor that strongly relates the durability of PCC pavement systems to prevailing environmental conditions. For this reason, the Kansas Department of transportation (KDOT) uses the Rapid Chloride Permeability testing protocol to determine the resistance of concrete to water, chlorides and other chemical intrusion. Typically, the Rapid Chloride Permeability test measures the number of coulombs that pass through a concrete sample over a period of six hours at a concrete age of 56 days. Results of this test make it possible to obtain the desired time-dependant concrete permeability response. During the past years, KDOT has performed numerous numbers of full six-hour permeability response tests. Unfortunately, KDOT has not been able to capitalize on the richness of the available full-response permeability database in order to shorten the testing duration. Accordingly, it is proposed herein that we utilize the statistical/artificial neural network (SANN) approach for the development of appropriate SANN-based models that can effectively project the full six-hour response from a shorter-duration permeability response. The proposed research is in direct response to KDOT's need to reduce the testing time of the currently used KDOT rapid chloride permeability test. These developed models will allow KDOT to reduce the duration of the Rapid Chloride Permeability test from 6 hours to 1 or 2 hours. Additionally, these models will allow KDOT to: i) increase the number of tests that can be performed in one day, and ii) minimize/eliminate damage to the testing cells, particularly, when excessively permeable concrete is tested. The proposed research will provide an excellent research opportunity to produce innovative prediction models that will impact Chloride Permeability testing procedure for KDOT and other DOT agencies.

• Record URL:
  http://transport.ksu.edu/files/transport/imported/Reports/2008/KSUTC-08-9.pdf
• 

Language

• English

Project

• Status: Active
• Funding: $95000.00
• Contract Numbers:

  RE-040-05; HDP-R043

  KSUTC-08-9

• Sponsor Organizations:

  Kansas State University Transportation Center

  Kansas State University
  Department of Civil Engineering
  Manhattan, KS  United States  66506

  Kansas Department of Transportation

  Eisenhower State Office Building
  700 SW Harrison Street
  Topeka, KS  United States  66603-3754
• Project Managers:

  Stokes, Robert

• Performing Organizations:

  Kansas State University Transportation Center

  Kansas State University
  Department of Civil Engineering
  Manhattan, KS  United States  66506
• Principal Investigators:

  Najjar, Jacoub

• Start Date: 20070228
• Expected Completion Date: 0
• Actual Completion Date: 20110630
• Source Data: RiP Project 15287

Subject/Index Terms

• TRT Terms: Chlorides; Concrete; Permeability; Portland cement concrete; Research projects; Testing; Time dependence
• Uncontrolled Terms: Rapid chloride permeability test
• Subject Areas: Highways; Pavements;

Filing Info

• Accession Number: 01462762
• Record Type: Research project
• Source Agency: Kansas State University Transportation Center
• Contract Numbers: RE-040-05; HDP-R043, KSUTC-08-9
• Files: UTC, RIP, STATEDOT
• Created Date: Jan 3 2013 2:09PM