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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 P21
Test Method for Recoveryof Asphalt From Solution By Abson Method (AE01)

This LTPP protocol describes the Abson recovery method of asphalt cement binder from solutions previously obtained by extracting asphalt mixtures with reagent-grade trichloroethylene.

This test shall be carried out in accordance with AASHTO T170-00 with the exception of some of the sections of the reference standard which have been modified as presented here. In all other sections, the test standard AASHTO T170-00 shall be followed as published.

This test shall be carried out on drilled cores and block specimens as well as uncompacted samples of both virgin and recycled asphalt-aggregate mixtures obtained from test sections included in the LTPP experiments.

1. SCOPE

1.2 This protocol may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety issues associated with its use. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use of this protocol.

2. APPLICABLE DOCUMENTS

2.4 LTPP Protocol

Protocol P04 - Determination of Asphalt Content (Extraction)
(Protocol P04 may be found in the LTPP Laboratory Testing Guide.)

4. SIGNIFICANCE AND USE

4.1 The asphalt should be extracted from the asphalt-aggregate mixture in accordance with Protocol P04 "Determination of Asphalt Content" utilizing reagent-grade trichloroethylene as the solvent.

Note 2 - Delete

9. PROCEDURE

9.4 If the residue in the flask is highly viscous at 325°F (163°C) so that dispersion of the carbon dioxide in the residue is restricted and the recovered asphalt is expected to have a penetration at 77°F (25°C) of less than 30, maintain the carbon dioxide gas flow and temperature for 20 to 22 minutes.

9.5 The recovered asphalt cement shall be heated to reliquify the sample and portions shall be obtained for penetration, specific gravity and viscosity determinations.

9.6 Ash content determinations shall be conducted on all recovered bitumens in accordance with ASTM Method D2939 and reported with other test data on the recovered asphalt. Ash contents of recovered asphalt greater than 1% may affect the accuracy of the penetration, specific gravity or viscosity tests.

11. REPORT

Record the following information on Form T21.

11.1 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.

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

11.3 Test Results

11.3.1 Mass of bitumen recovered.

11.3.2 Ash content of bitumen.

11.3.3 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
RECOVERY OF ASPHALT FROM SOLUTION BY ABSON METHOD
LAB DATA SHEET T21

ASPHALT CONCRETE LAYER (ASPHALT CEMENT PROPERTIES)
LTPP TEST DESIGNATION: AE01/LTPP PROTOCOL P21

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. MASS OF RECOVERED BITUMEN (grams) __ __ __.__

6. ASH CONTENT OF BITUMEN (percent) __.__

7. COMMENTS

      (a) CODE __ __ __ __ __ __ __ __ __ __ __ __

      (b) NOTE _______________________________________________________

8. TEST DATE __ __-__ __-__ __ __ __

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

 

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