A Comprehensive Study of Field Permeability Using the Vacuum Permeameter

Williams, Stacy G.; University of Arkansas, Fayetteville. Dept. of Civil Engineering

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ROSA P serves as an archival repository of USDOT-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by USDOT or funded partners. As a repository, ROSA P retains documents in their original published format to ensure public access to scientific information.

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A Comprehensive Study of Field Permeability Using the Vacuum Permeameter

2006-06-01
By Williams, Stacy G.

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English

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Details:

Creators:

Williams, Stacy G.
Corporate Creators:

University of Arkansas, Fayetteville. Dept. of Civil Engineering
Corporate Contributors:

Mack-Blackwell Transportation Center (University of Arkansas) ; United States. Dept. of Transportation. Transportation Systems Center ; University Transportation Centers Program (U.S.)

Mack-Blackwell Transportation Center (University of Arkansas) ; United States. Dept. of Transportation. Transportation Systems Center ; University Transportation Centers Program (U.S.) Less -
Subject/TRT Terms:

[+]

Asphalt Mixtures Cores (Specimens) Cracking Density Design Falling Head Test Field Tests Highways I22: Design Of Pavements, Railways And Guideways I23: Properties Of Road Surfaces I31: Bituminous Binders And Materials Materials Moisture Damage Oxidation Pavements Permeability Permeameters Quality Assurance Quality Control Sample Size Stripping (Pavements)
Publication/ Report Number:

MBTC-2054
Resource Type:

Tech Report
Geographical Coverage:

United States ; Arkansas

United States ; Arkansas Less -
TRIS Online Accession Number:

01034026
Corporate Publisher:

University of Arkansas, Fayetteville. Dept. of Civil Engineering
Abstract:

The permeability of coarse-graded asphalt mixtures has been a great concern in recent years. Asphalt mixes that are permeable are susceptible to a number of distresses such as moisture damage, raveling, cracking, and binder oxidation. This project examined three field devices for the determination of permeability. These methods were the NCAT falling-head field permeameter (NCAT), the Kuss constant-head field permeameter (KSFP), and the Kuss vacuum permeameter (VACP). Seven sites were mapped according to the VACP method in order to determine the location and distribution of permeable voids. These results were compared to the permeability measurements obtained by the NCAT and KSFP methods. Mixes having three different nominal maximum aggregate sizes were tested, and field cores were cut in order to provide a relationship of permeability and density. Also, the variability of the pavement sites was evaluated as a means to determine the minimum required sample size for field permeability testing. Overall, the various methods for determining field permeability do not yield similar results. In most cases, the falling head test (NCAT method) yielded the largest values. Pavement sections that clearly failed the density specification had high permeability, and sections that clearly passed the minimum density specification were relatively impermeable. Pavements with marginal density were somewhat permeable, and contained variable levels of permeability. In general, high permeability was exhibited near the longitudinal joints. The variability of the sites was evaluated in order to determine an appropriate sample size. Relatively impermeable pavements were consistent, and pavements with MBTC 2054 moderate or high permeability were more variable. Relationships between sample size, reliability, and testing discrimination were presented. Based on the range of standard deviations measured in this project, a minimum sample size of 10 is recommended for pavements with marginal densities or variable consistency. This sample size is based on the variability of the pavement, not the variability of the device(s) used for testing. Based on the results of this study, permeability test results are highly dependent upon the placement of the permeameter during testing and the variability of the pavement. Field permeability testing may have value as a forensic tool, but the large required sample size is not conducive to standard quality control procedures. Therefore, extreme caution should be exercised before implementing field permeability testing as a quality control or quality assurance measure.
Format:

PDF
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:62c00c5d8e42c32df59df6acf54d954a02edddce2697c2521a25c5656ebb1edb
Download URL:

https://rosap.ntl.bts.gov/view/dot/39766/dot_39766_DS1.pdf
File Type:

[PDF-22.06 MB]