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HMAC TEST PROCEDURES CITED IN: Supplemental HMAC Test Proced 2008 Final.doc
4/7/2008

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SUPPLEMENTAL TEST PROCEDURES FOR
HMAC AND EAC
CITED IN:
Contractor Mix Design Guidelines for Asphalt Concrete
JANUARY 2008




PAGE 2
ODOT TM 313 EAC MIX DESIGNS

PAGE 9
ODOT TM 316 ADDING LIME & ANTISTRIP TO
HMAC

PAGE 11
ODOT TM 318 OPEN GRADED MIX DESIGNS

PAGE 21
ODOT TM 330 SUPERPAVE VOLUMETRIC MIX
DESIGN FOR DENSE GRADED HMAC

PAGE 35
ODOT TM 319 PREPARATION AND
CHARACTERIZATION OF RAP MATERIALS FOR
MIX DESIGN

Supplemental HMAC Test Proced 2008 Final.doc
4/7/2008

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MATERIALS LABORATORY

ODOT Test Method 313-05


Method of Test for
COMPRESSIVE STRENGTH AND MIX DESIGN
OF EMULSIFIEDASPHALT MIXTURES

(Modified AASHTO Designation T 165 & 167)


SCOPE

1.1
This method of test for compacted Emulsified Asphalt Concrete (EAC) mixtures of
the cold-mixed, cold laid type for use in pavement surfaces and base courses is
intended to evaluate the asphalt-aggregate compatibility in the mixture. It employs the
relative compressive strength of conditioned versus unconditioned test specimens.
Mixtures with compatible materials will generally have a compressive strength ratio
of 40 or more.


APPARATUS

2.1
Steel compaction mold -- 4.0 in (101.6 mm.) inside diameter, 4.5 in (114 mm.)
outside diameter and 7.0 in (178 mm.) height.


Mold holder, funnel, plunger and mixing bowls approximately 3 quart capacity.

2.2
Testing Machine - The testing machine may be of any type of sufficient capacity that
will provide a range of accurately controllable rates of vertical deformation. Since the
rate of vertical deformation for the compression test is specified as 0.05 in (1.3 mm.)
per minute per 1 in (25 mm.) of specimen height, and it may be necessary to test
specimens ranging in size from 2 x 2 in (50 x 50 mm.) to perhaps 8 x 8 in (200 x 200
mm.), in order to maintain the specified minimum ratio of specimen diameter to
particle size, the testing machine should have a range of controlled speeds covering at
least 0.1 in (2.5 mm.) per minute for 2 in (50 mm.) specimens to 0.4 in (10 mm.) per
minute for 8 in (200 mm.) specimens.


For central control laboratory installations, the testing machine shall conform to the
requirements of section 14 of the Methods of Verification of Testing Machines
(AASHTO T67). The testing machine shall be equipped with two steel bearing blocks
with hardened faces, one is spherically seated and the other plain. The spherically
seated block shall be mounted to bear the on the upper surface of the test specimen
and the plain block shall rest on the platen of the testing machine to form a seat for Supplemental HMAC Test Proced 2008 Final.doc
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the specimen. The bearing faces of the plates shall have a diameter slightly greater
than that of the largest specimens to be tested.


The bearing faces, when new, shall not depart from a true plane by more than 0.0005
in (0.013 mm.) at any point and shall be maintained within a permissible variation
limit of 0.001 in (0.025 mm.). In the spherically seated block, the center of the sphere
shall coincide with the bearing face. The movable portion of this block shall be held
closely in the spherical seal, but the design shall be such that the bearing face can be
rotated freely and tilted through small angles in any direction.

2.3
Air Bath - The air bath shall be capable of either manual or automatic control for
storing the specimens at 77
± 1° F (25 ± 0.5° C) immediately prior to making the
compression test.

2.4
Balance - A balance having a capacity of 2000 grams or more and a sensitivity of 0.1
g for weighing the ingredients of the mixture shall be provided.

2.5
Glass or plexiglass plates for use under the specimens while being cured; 4.5 in (114
mm.) square by 0.25 in (6 mm.) thick. One of these plates shall be kept under each of
the specimens during the immersion period and during subsequent handling, except
when weighing and testing, in order to prevent breakage or distortion of the
specimens.

2.6
Containers approximately 5 in (125 mm.) by 5 in (125 mm.) by 6 in (150 mm.) high
to surround the test specimens in the conditioning bath, described in section 2.7.

2.7
One or more automatically controlled water baths shall be provided for immersing the
B specimens. The baths shall be of sufficient size to permit total immersion of the
test specimens. They shall be so designed and equipped as to permit accurate and
uniform control of the immersion temperature within plus or minus 1.8
° F (1° C).
They shall be constructed of or lined with copper, stainless steel, or other non-
reactive material.


PREPARATION OF TEST MIXTURES

3.1
In preparing aggregates for making mixtures, a sieve analysis shall be made on each
aggregate involved. All coarse aggregates shall be separated individually and
recombined in the necessary quantities with the fine aggregates to meet the formula
under study.


3.1.1 Obtain test gradation from average field gradations.


3.1.2 Set up worksheets, recording project information and design gradation.
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3.1.3 Test specimens will normally be 1700 grams per sample. This weight will
normally make cylinders 4.0 in (102 mm.) in diameter and 4.0
± 0.1 in (102 ±
2.5 mm.) in height. The size of the test specimens has an influence on the
results of the compressive strength test. Therefore, if the known specific
gravity or unit weight of the aggregate indicates an excessive variation in
height, a correction must be determined. Fabricate and measure asphalt coated
compacted sample to determine the required correction to the batch weights.


3.1.4 Screen and separate aggregate in sizes dictated by the design gradation.


3.1.5 Weigh out a minimum of eight samples using the gradation described in
section
3.1.2.

3.2
Emulsion contents, expressed as percents of the dry aggregate weight, shall be 5.0,
6.0, 7.0 and 8.0%.


Example: Calculation for weight of emulsion at 5.5% of oven dry aggregate when
the aggregate weight is 1720 grams:



grams

94.6





100
(5.5)

grams)

(1720





100
Emulsion)

(%

Aggregate)
Dry
(

Emulsion

of

Mass
=
=
=




Two specimens shall be made at each emulsion content. One series shall be
designated as A specimens and will be tested for compressive strength. These will
serve as control or dry specimens. The other series, designated as B specimens,
will be tested wet as described in Section 7.

3.3
An initial batch shall be mixed for the purpose of buttering the mixing bowl. This
batch shall be emptied after mixing and the sides of the bowl shall be cleaned of
mixture residue by scraping with a small limber spatula but shall not be wiped with
cloth or cleaned with solvent, except when a change is to be made in the binder or at
the end of a run.

3.4
Place the aggregate in the mixing bowl. Add clean water to the aggregate in
increments of 0.5% of dry aggregate weight. After adding each increment, mix
thoroughly by hand. Repeat until the surface of the aggregate is thoroughly moistened
and very little free water is present.
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3.5
Add the pre-determined amount of emulsion to the moistened aggregate. Stir 2 to 3
minutes or until complete aggregate coating is achieved. If mix becomes stiff before
aggregate is completely coated, terminate the mixing.


3.6
Evenly spread the mixture in a large flat bottomed pan, 2 x 9 x 13 in (50 x 230 x 330
mm.) and cure at room temperature until the emulsion breaks and for a minimum of
24 hours. Additional curing time will be required if any unbroken emulsion remains
in the pan, but should not exceed 72 hours. Stir the sample after each 24 hour
increment of curing.

3.7
When curing is completed, observe and record the percent of coated aggregate.

3.8
Repeat steps 3.4 - 3.7 for each sample required.


MOLDING

4.1
Place approximately one-half of the mixture in the mold. The mixture shall be spaded
vigorously twenty-five times with a flat bladed spatula with fifteen blows being
delivered around the inside of the mold to reduce honeycomb. The remaining half of
the mixture shall then be quickly transferred to the mold and similar spading action
repeated. The spatula should penetrate the mixture as deeply as possible. The top of
the mixture should be slightly rounded or cone-shaped to aid in firm seating of the
upper plunger.


4.2
In order to place a leveling preload on the specimen, proceed as follows:

4.2.1 Place the mold/mold holder assembly with shims in place, on the bottom
platen of compression testing machines.


4.2.2 Place shims in the upper platen to prevent tilting under load.

4.2.3 Place the upper plunger on the specimen and exert an initial leveling load of
150 psi (1034 kPa) which shall be he