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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 P24
Test Method for Viscosityof Asphalt Cement At 77°F With Cone and Plate Viscometer

This LTPP protocol covers the determination of the viscosity of asphalt cement at 77°F (25°C) by means of a cone-plate viscometer.

This test shall be carried out in accordance with ASTM D3205-86 with the exception of some of the sections of the reference standard which have been modified as presented herein. In all other sections the test standard (ASTM D3205-86) shall be followed as written. The test will be carried out on asphalt cement samples extracted from AC core and block specimens as well as uncompacted samples of both virgin and recycled asphalt-aggregate mixtures obtained from test sections included in the LTPP SPS experiments.

1. SCOPE

1.1 This test method covers the determination of the viscosity of asphalt cement by means of a cone-plate viscometer. It is applicable to materials exhibitin viscosities in the range from 103 to 1010 Poises (102 to 109 PaS) and is therefore suitable for use at 77°F (25°C) for asphalt cements. The shear rate may vary between approximately 10-3 to 10-2 s-1 and the method is suitable for determination on materials having either Newtonian or non-Newtonian flow properties.

9. PREPARATION OF APPARATUS

9.1 Maintain the bath at 77 ± 0.02°F (25 ± 0.01°C). Apply the necessary corrections, if any, to all thermometer readings.

10. PROCEDURE

10.5 Measure the angular velocity for increasing loads using 100-, 300-, 1,000-, 3,000- and 10,000-gram (0.2-, 0.7-, 2.2-, 6.6- and 22-lb) loads starting with the smallest and applying them successively at no more than 10-minute intervals between each application.

10.6 DELETE

11. CALCULATION

11.1 Select the calibration factors corresponding to the cone and cord used. For each load and angular velocity, calculate the shear stress, S, in dynes per square centimeter, the shear rate, D, in reciprocal seconds, and the viscosity, ?, in megapoise as follows:

S = Ks (L - F)

D equals K sub D times the ratio of theta over t

nu equals (S divided by D) divided by 1 times 10 to the sixth power

12. REPORT

Record the following on Form T24:

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 Test Date.

12.3 Test Results

12.3.1 Record the test temperature in degrees fahrenheit.

12.3.2 Viscosity in megapoise for each load.

12.3.3 Shear rate in reciprocal seconds for each load.

12.3.4 If fracture occurs, record the shear stress resulting in the fracture in dynes per square centimeter.

12.4 Comments shall include LTPP standard comment code(s) as shown in Section 4.3 of the LTPP Laboratory Testing Guide, and any other note as needed.

LTPP LABORATORY MATERIAL HANDLING AND TESTING
LABORATORY MATERIAL TEST DATA
VISCOSITY OF ASPHALT CEMENT AT 77°F
TEST DATA SHEET T24

ASPHALT CONCRETE LAYER (ASPHALT CEMENT PROPERTIES)
LTPP TEST DESIGNATION: AE04/LTPP PROTOCOL P24

LABORATORY PERFORMING TEST: ____________________________________________________________

LABORATORY IDENTIFICATIO 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. TEST TEMPERATURE, °F __ __.__ __

6. LOAD: 100 GRAMS

      (a) VISCOSITY, megapoise __ __.__ __ __

      (b) SHEAR RATE, s-1 __.__ __

7. LOAD: 300 GRAMS

      (a) VISCOSITY, meagpoise __ __.__ __ __

      (b) SHEAR RATE, s-1 __.__ __

8. LOAD: 1000 GRAMS

      (a) VISCOSITY, meagpoise __ __.__ __ __

      (b) SHEAR RATE, s-1 __.__ __

9. LOAD: 3000 GRAMS

      (a) VISCOSITY, meagpoise __ __.__ __ __

      (b) SHEAR RATE, s-1 __.__ __

10. LOAD 10000 GRAMS

      (a) VISCOSITY, meagpoise __ __.__ __ __

      (b) SHEAR RATE, s-1 __.__ __

11. FRACTURE (only to be completed if fracture of specimen occurs)

      (a) LOAD, grams __ __ __ __ __.

      (b) SHEAR STRESS, dynes/cm2 __ __.__ __ __ __ __

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). 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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