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Publication Number: FHWA-RD-07-052
Date: September 2007

Long Term Pavement Performance Project Laboratory Materials Testing and Handling Guide

Protocol P68
Test Method for Microscopical Determinationof Parametersof The Air-Void System in Hardened Concrete Using The Linear Traverse (Rosiwal) Method (Pc08)

This protocol covers the test method for determining the air-void content and parameters of the air-void system in hardened concrete using the linear traverse (Procedure A) method. This protocol is based on ASTM C457-98 (Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete). The test shall be performed in accordance with this standard (ASTM C457-98), as modified herein. Those sections of the ASTM standard included in this protocol by reference and without modification shall be strictly followed. All other sections of this protocol shall be followed as written herein.

1. SCOPE

1.1 Only the linear traverse method shall be used.

4. SAMPLING

4.2 Delete

4.3 Delete

12. DELETE

13. DELETE

14. DELETE

15. REPORT

The following information shall be recorded on Form T68.

15.1 Sample identification shall include: Laboratory Identification Code, LTPP Region, State, State Code, Experiment Number, SHRP ID, Field Set Number, Sampling Area Number, Location Number, Layer Number, and Sample Number.

15.2 Test identification shall include: LTPP Test Designation, LTPP Protocol Number, Laboratory Test Number and the Test Date.

15.3 Test Results

15.3.1 Record all calculation parameters as required on Form T68.

15.3.2 Report the values for A, a, and L to the nearest two significant digits.

15.4 Comments shall include LTPP standard comment codes, as shown in Section 4.3 of this Guide and any other notes as needed.

LTPP LABORATORY MATERIAL HANDLING AND TESTING
LABORATORY MATERIAL TEST DATA
AIR CONTENT OF HARDENED CONCRETE
LAB DATA SHEET T68

PORTLAND CEMENT CONCRETE
LTPP TEST DESIGNATION PC08/LTPP PROTOCOL P68

LABORATORY PERFORMING TEST: _____________________________________________________________

LABORATORY IDENTIFICATION CODE: ___ ___ ___ ___

REGION: _________________________ STATE: STATE CODE: __ __

EXPERIMENT NO: _____ SHRP ID: __ __ __ __

SAMPLED BY: _________________________________________ FIELD SET NO: ___

DATE SAMPLED: __ __ - __ __ - __ __ __ __ SAMPLING AREA NO: SA- ____

1. LAYER NUMBER __ __

2. LOCATION NUMBER __ __ __ __ __

3. LABORATORY TEST NUMBER __ __

4. LTPP SAMPLE NUMBER __ __ __ __ __ __

5. TRAVERSE DIMENSIONS

  1. TRAVERSE LENGTH THROUGH AIR (Ta), inches __ __.__ __ __
  2. TRAVERSE LENGTH THROUGH PASTE (Tp), inches __ __.__ __ __
  3. TOTAL LENGTH OF TRAVERSE (Tt), inches __ __ __

6. NUMBER OF AIR VOIDS INTERSECTED, N __ __ __ __ __

7. AIR CONTENT (A), percent __ __.__

8. AVERAGE CHORD LENGTH (l), inches 0.__ __ __

9. SPECIFIC SURFACE (a), inches-1 __ __ __ __

10. SPACING FACTOR (L), inches 0.__ __ __

11. PASTE-AIR RATIO (p/A) __ __.__ __ __

12. COMMENTS

      (a) CODE ____ ____ ____ ____ ____ ____

      (b) NOTE ________________________________________________________

13.TEST DATE __ __-__ __-__ __ __ __

GENERAL REMARKS:___________________________________________________________________________
SUBMITTED BY, DATECHECKED AND APPROVED, DATE
____________________________________________________________
LABORATORY CHIEF
Affiliation______________________
Affiliation______________________

 

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The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT).
The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT). Provide leadership and technology for the delivery of long life pavements that meet our customers needs and are safe, cost effective, and can be effectively maintained. Federal Highway Administration's (FHWA) R&T Web site portal, which provides access to or information about the Agency’s R&T program, projects, partnerships, publications, and results.
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