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Publication Number: FHWA-RD-07-052
Date: September 2007
This LTPP Protocol describes the determination of the specific gravity of coarse aggregate extracted from AC. This test shall be conducted after completion of LTPP Test Designation AG04 (LTPP Protocol P14 - Gradation of Extracted Aggregate) and shall be carried out in accordance with AASHTO T85-04 as modified herein. Only sections of the referenced standard which have been modified are included below. In all other sections, the standard (AASHTO T85-04) 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 coarse aggregate. The bulk specific gravity and absorption are based on aggregate subjected to 15 hours of soaking in water. This method is not intended for use with lightweight aggregate.
2.3 LTPP Protocols
Protocol P04 - Determination of Asphalt Content (Extraction)
Protocol P12 - Specific Gravity and Absorption of Extracted Fine Aggregate
Protocol P14 - Gradation of Extracted Aggregate
7.2 Retrieve all material retained on the No. 4 (4.75-mm) and larger sieve after completion of LTPP Protocol P04 - Gradation of Extracted Aggregate.
7.3 Add - Note 1a: if minimum sample weights are not obtained, the test shall still be performed, however, comment code "01" shall be used to report this condition.
Record the following information on Form T11.
10.1 Sample identification shall include: Laboratory Identification Code, Region, State, State Code, SHRP ID, Field Set Number, Sampling Area Number, Layer Number, Location Number and LTPP Sample Number.
10.2 Test identification shall include: LTPP Test Designation, LTPP Protocol Number, Laboratory Test Number, and the Test Date.
10.3 Test Results
10.3.1 Weight of test sample, grams.
10.3.2 Weight of oven dry test sample in air (A), grams.
10.3.3 Weight of saturated surface-dry (SSD) test sample in air, (B) grams.
10.3.4 Weight of saturated surface-dry (SSD) test sample in water, (C) grams.
10.3.5 Bulk specific gravity of coarse aggregate (to two decimal places).
10.3.6 Percent absorption (to one decimal place).
10.3.7 Comments shall include LTPP standard comment code(s) as shown 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 COARSE AGGREGATE
LAB DATA SHEET T11
ASPHALT CONCRETE LAYER (EXTRACTED AGGREGATE)
LTPP TEST DESIGNATION: AG01/LTPP PROTOCOL P11
LABORATORY PERFORMING TEST:______________________________________________________________PRIVATE
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 (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 SSD TEST SAMPLE IN AIR (B), grams __ __ __ __.__
8. WEIGHT OF SSD TEST SAMPLE IN WATER (C), grams __ __ __ __.__
9. BULK SPECIFIC GRAVITY OF COARSE AGGREGATE __ __.__ __
10. ABSORPTION OF COARSE AGGREGATE __ __.__
(a) CODE __ __ __ __ __ __ __ __ __ __ __ __
(b) NOTE _______________________________________________________
12. TEST 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