U.S. Department of Transportation
Federal Highway Administration
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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
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Publication Number: FHWA-RD-07-052
Date: September 2007
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.
1.1 Only the linear traverse method shall be used.
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
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) __ __.__ __ __
(a) CODE ____ ____ ____ ____ ____ ____
(b) NOTE ________________________________________________________
13.TEST DATE __ __-__ __-__ __ __ __
|SUBMITTED BY, DATE||CHECKED AND APPROVED, DATE|
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Topics: research, infrastructure, pavements and materials
Keywords: research, infrastructure, pavements and materials, Asphalt cement, asphalt concrete, field sampling, General Pavement Studies, laboratory testing, LTPP, material properties, pavement layering, Pavement Performance Data Base, portland cement concrete, protocol,Specific Pavement Studies, subbase, subgrade, treated base, unbound base
TRT Terms: research, facilities, transportation, highway facilities, roads, parts of roads, pavements