U.S. Department of Transportation
Federal Highway Administration
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Federal Highway Administration Research and Technology
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Publication Number: FHWA-RD-07-052
Date: September 2007
This LTPP protocol describes the determination of the specific gravity of the fine aggregate extracted from AC. This test shall be conducted after completion of LTPP Test Designation AG04 (LTPP Protocol P14 - Gradation of Extracted Aggregate) and this test shall be carried out in accordance with AASHTO T84-88 as modified herein. Only sections of the referenced standard which have been modified are included below. In all other sections, the standard (AASHTO T84-88) shall be followed as published. The test shall be performed on aggregate extracted from the test sample used for the asphalt content test (LTPP Test Designation AC04) on samples retrieved from projects included in the LTPP experiments.
1.1 This method covers the determination of the bulk specific gravity and absorption of extracted fine aggregate at 73.4/73.4°F (23/23°C).
2.3 LTPP Protocols
Protocol P04 - Determination of Asphalt Content (Extraction)
Protocol P11 - Specific Gravity and Absorption of Extracted Coarse Aggregate
Protocol P14 - Gradation of Extracted Aggregate
5.1 The sample for test shall be obtained from the fine aggregate (material passing the No. 4 [4.75-mm] sieve) used for LTPP Protocol P14 (Gradation of Extracted Aggregate).
6.1 Obtain approximately 1 kg (2.2 lbs) of fine aggregate from the sample used in LTPP Protocol P14. If this minimum sample weight cannot be obtained, the test shall still be performed, however, comment code "01" from Section 4.3 of the LTPP Laboratory Testing Guide shall be used to report this condition.
Record the following information on Form T12.
12.1 Sample identification shall include: Laboratory Identification Code, LTPP Region, State, State Code, SHRP ID, Field Set Number, Sampling Area Number, Layer Number, Location Number and LTPP Sample Number.
12.2 Test identification shall include: LTPP Test Designation, LTPP Protocol Number, Laboratory Test Number, and the Test Date.
12.3 Test Results
12.3.1 Weight of test sample, grams.
12.3.2 Weight of oven dry test sample in air (A), grams.
12.3.3 Weight of pycnometer filled with water (B), grams.
12.3.4 Weight of pycnometer with specimen and water to calibration mark (C), grams.
12.3.5 Weight of saturated surface-dry (SSD) specimen (S), grams.
12.3.6 Bulk specific gravity of fine extracted aggregate.
12.3.7 Percent absorption.
12.3.8 Comments shall include LTPP standard comment code(s) as shown in Section 4.3 of this Guide, and any other note as needed.
LTPP LABORATORY MATERIAL HANDLING AND TESTING
LABORATORY MATERIAL TEST DATA
SPECIFIC GRAVITY AND ABSORPTION OF EXTRACTED FINE AGGREGATE
LAB DATA SHEET T12
ASPHALT CONCRETE LAYER (EXTRACTED AGGREGATE)
LTPP TEST DESIGNATION: AG02/LTPP PROTOCOL P12
LABORATORY PERFORMING TEST:______________________________________________________________PRIVATE
LABORATORY IDENTIFICATION CODE: __ __ __ __
LTPP REGION _________________ STATE ___________________ STATE CODE __ __
EXPERIMENT NO _____ SHRP ID __ __ __ __
SAMPLED BY: ______________________________________________ FIELD SET NO. __ __
DATE SAMPLED: __ __-__ __-__ __ __ __ SAMPLING AREA No: SA- __ __
1. LAYER NUMBER (FROM LAB SHEET L04 AND FORM T01B) __
2. LOCATION NUMBER __ __ __
3. LABORATORY TEST NUMBER __
4. LTPP SAMPLE NUMBER __ __ __ __
5. WEIGHT OF TEST SAMPLE, grams __ __ __ __.__
6. WEIGHT OF OVEN DRY TEST SAMPLE IN AIR (A), grams __ __ __ __.__
7. WEIGHT OF PYCNOMETER FILLED WITH WATER (B), grams __ __ __ __.__
8. WEIGHT OF PYCNOMETER WITH SPECIMEN AND WATER TO CALIBRATION
MARK (C), grams __ __ __ __.__
9. WEIGHT OF SSD SPECIMEN (S), grams __ __ __ __.__
10. BULK SPECIFIC GRAVITY OF FINE EXTRACTED AGGREGATE __ __.__ __
11. PERCENT ABSORPTION OF FINE AGGREGATE __ __.__
(a) CODE __ __ __ __ __ __ __ __ __ __ __ __
(b) NOTE _______________________________________________________
13. TEST DATE __ __-__ __-__ __ __ __
|SUBMITTED BY, DATE||CHECKED AND APPROVED, DATE|
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