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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 P14
Gradationof AGgregate Extracted From Asphaltic Concrete (AG04)

This LTPP protocol covers the determination of the gradation of the aggregate extracted from AC after completion of LTPP Test Designation AC04 (LTPP Protocol P04). This test shall be carried out in accordance with AASHTO T30-98 as modified by the following. Only sections of the referenced standard which have been modified are included below. In all other sections the standard shall be followed as written. The test shall be performed on aggregate extracted from the test sample used for the asphalt content test (LTPP Test Designation AC04).

6. PROCEDURE

6.5 The aggregate shall then be sieved over sieves of the various sizes required (see Section 7.3) including the 0.075-mm (No. 200) sieve. The weight of material passing each sieve and retained on the next and the amount passing the 0.075-mm (No. 200) sieve shall be recorded. The summation of these various weights must check the dried weight after washing within 0.2 percent of the total weight. The weight of dry material passing the 0.075-mm (No. 200) sieve by dry sieving shall be added to the weight of mineral matter in the bitumen and the weight removed by washing in order to obtain the total passing 0.075-mm (No. 200) sieve. If it is desired to check the weight of material washed through the 0.075-mm (No. 200) sieve, the wash water may be evaporated to dryness or filtered through a tarred filter paper which is subsequently dried and weighed. The weights of fractions retained on the various sieves and the total passing the 0.075-mm (No. 200) sieve shall be converted to percentages by dividing each by the total weight of aggregate in the bituminous mixture from Section 6.1.

After sieving, combine the material from the 2.00-mm (No. 10), 0.425-mm (No. 40), 0.180-mm (No. 80), 0.075-mm (No. 200) sieves and the pan and save this sample in double plastic bags. These samples will be used in the future to conduct protocol P14A, Fine Aggregate Particle Shape. Use sturdy double plastic bags and seal or tie each carefully to prevent loss and intermixing. Identify each sample by enclosing a Xerox copy of the T14 laboratory test data sheet which shall be fully completed and approved. This form shall have the complete identification of the layer and sample. Further instructions concerning the disposition of these samples will be issued at a later date.

Table 4.32 of this Guide shall be consulted to assign a material code for geologic classifications.

7. REPORT

7.1 Sample Identification shall include: Laboratory Identification Code, Region, State, State Code, SHRP ID, Layer Number, Field Set Number, Sample Area Number, Sample Location Number, LTPP Sample Number.

7.2 Test Identification shall include: Laboratory Test Number, Test Date, LTPP Test Designation, LTPP Protocol Number.

7.3 Test Results
The results of the sieve analysis shall be reported as the percent weight of dry aggregate passing each sieve to the appropriate number of significant figures and decimal places as follows:

Sieve Size Percent Passing
1 ½ in. (37.5-mm) __ __ __.
1 in. (25.0-mm) __ __ __.
¾ in. (19.0-mm) __ __ __.
½ in. (12.5-mm) __ __ __.
3/8 (9.5-mm) __ __ __.
#4 (4.75-mm) __ __ __.
#10 (2.00-mm) __ __.
#40 (0.425-mm) __ __.
#80 (0.180-mm) __ __.
#200 (0.075-mm) __ __ . __

Primary Geologic Classification Code __ __

Secondary Geologic Classification Code (A) __ __

Secondary Geologic Classification Code (B) __ __

The secondary geologic classification codes (A) and (B) are not mandatory data entry fields. These codes should only be assigned to the test sample when a secondary constituent geologic classification code shall always be assigned to the major geologic aggregate constituent.

7.4 Comments shall include LTPP Standard comment code(s) as shown in Section 4.3 of this Guide and any other note as needed.

7.5 Use Form T14 (Test Sheet T14) to report the above information (Items 7.1 to 7.4).

LTPP LABORATORY MATERIAL HANDLING AND TESTING
LABORATORY MATERIAL TEST DATA
GRADATION OF AGGREGATE
LAB DATA SHEET T14

ASPHALTIC CONCRETE LAYER (ASPHALTIC CONCRETE PROPERTIES)
LTPP TEST DESIGNATION AG04/LTPP PROTOCOL P14

LABORATORY PERFORMING TEST:____________________________________________________

LABORATORY IDENTIFICATION CODE:__ __ __ __

REGION _______________ STATE ___________________ STATE CODE __ __

EXPERIMENT NO _____

SAMPLED BY: _______________________________________ FIELD SET NO. __

DATE SAMPLED: __ __-__ __-__ __ __ __

1. LAYER NUMBER (FROM LAB SHEET L04 AND FORM T01B) __

2. SHRP ID __ __ __ __ __ __ __ __ __ __ __ __
3. SAMPLING AREA NO. (SA-) __ __ __ __ __ __
4. LABORATORY TEST NUMBER __ __ __
5. LOCATION NUMBER __ __ __ __ __ __ __ __ __
6. LTPP SAMPLE NUMBER __ __ __ __ __ __ __ __ __ __ __ __
7. GRADATION, % PASSING EACH SIEVE SIZE
Standard (mm)
1 ½ inch (37.5 mm) __ __ __ . __ __ __ . __ __ __ .
1 inch (25.0 mm) __ __ __ . __ __ __ . __ __ __ .
¾ inch (19.0 mm) __ __ __ . __ __ __ . __ __ __ .
½ inch (12.5 mm) __ __ __ . __ __ __ . __ __ __ .
3/8 inch (9.5 mm) __ __ __ . __ __ __ . __ __ __ .
#4 (4.75 mm) __ __ __ . __ __ __ . __ __ __ .
#10 (2.00 mm) __ __ . __ __ . __ __ .
#40 (0.425 mm) __ __ . __ __ . __ __ .
#80 (0.180 mm) __ __ . __ __ . __ __ .
#200 (0.075 mm) __ __ . __ __ __ . __ __ __ . __
PRIMARY GEOLOGICAL CLASSIFICATION CODE __ __ __ __ __ __
SECONDARY GEOLOGICAL CLASSIFICATION CODE (A) __ __ __ __ __ __
SECONDARY GEOLOGICAL CLASSIFICATION CODE (B) __ __ __ __ __ __
8. COMMENTS
      (a) CODE __ __ __ __ __ ____ __ __ __ __ __ __ __ __ __ __ ____ __ __ __ __ __ __ __ __ __ __ ____ __ __ __ __ __
      (b) NOTE ________________________________ ________________________________ ________________________________
9. TEST DATE __ __ - __ __ - __ __ __ __ __ __ - __ __ - __ __ __ __ __ __ - __ __ - __ __ __ __
GENERAL REMARKS:___________________________________________________________________________
SUBMITTED BY, DATECHECKED AND APPROVED, DATE
____________________________________________________________
LABORATORY CHIEF
Affiliation______________________
Affiliation______________________

 

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