AASHTO T 321-22 测定经受反复弯曲的压实沥青混合物的疲劳寿命的标准试验方法 2022

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史蒂文 2025-12-11 16 1.87MB 12 页 18星币
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lOMoARcPSD|50251626
Standard
Method
of
Test
for
Determining
the
Fatigue
Life
of
Compacted
Asphalt
Mixtures
Subjected
to
Repeated
Flexural
Bending
AASHTO
Designation:
T
321-22
AASHlO
Technically
Revised:
2022
Technical
Subcommittee:
2d,
Proportioning
of
Asphalt-Aggregate
Mixtures
1.
SCOPE
1.1.
This
standard
provides
procedures
for
determining
the
fatigue
life
and
fatigue
energy
of
380
mm
long
by
50
mm
thick
by
63
mm
wide
asphalt
mixture
beam
specimens
sawed
from
laboratory-
or
field-compacted
asphalt
mixtures
and
subjected
to
repeated
flexural
bending
until
failure.
1.2.
This
standard
may
involve
hazardous
materials,
operations,
and
equipment.
This
standard
does
not
purport
to
address
all
of
the
safety
concerns
associated
with
its
use.
It
is
the
responsibility
of
the
user
of
this
procedure
to
establish
appropriate
safety
and
health
practices
and
to
determine
the
applicability
of
regulatory
limitations
prior
to
use.
1.3.
The
quality
of
the
results
produced
by
this
standard
are
dependent
on
the
competence
of
the
personnel
performing
the
procedure
and
the
capability,
calibration,
and
maintenance
of
the
equipment
used.
Agencies
that
meet
the
criteria
ofR
18
are
generally
considered
capable
of
competent
and
objective
testing/sampling/inspection/etc.
Users
of
this
standard
are
cautioned
that
compliance
with
R
18
alone
does
not
completely
assure
reliable
results.
Reliable
results
depend
on
many
factors;
following
the
suggestions
of
R
18
or
some
similar
acceptable
guideline
provides
a
means
of
evaluating
and
controlling
some
of
those
factors.
2.
REFERENCED
DOCUMENTS
2.1.
AASHTO
Standards:
M
339M/M
339,
Thermometers
Used
in
the
Testing
of
Construction
Materials
PP
3,
Preparing
Hot
Mix
Asphalt
(HMA)
Specimens
by
Means
of
the
Rolling
Wheel
Compactor1
R
18,
Establishing
and
Implementing
a
Quality
Management
System
for
Construction
Materials
Testing
Laboratories
R
66,
Sampling
Asphalt
Materials
R
90,
Sampling
Aggregate
Products
R
97,
Sampling
Asphalt
Mixtures
T
247,
Preparation
of
Test
Specimens
of
Hot
Mix
Asphalt
(HMA)
by
Means
of
California
Kneading
Compactor
T
269,
Percent
Air
Voids
in
Compacted
Dense
and
Open
Asphalt
Mixtures
TS-2d
T
321-1
AASHTO
©
2022
by
the
American
Association
of
State
Highway
and
Transportation
Officials.
All
rights
reserved.
Duplication
is
a
violation
of
applicable
law.
lOMoARcPSD|50251626
2.2.
I
ASTM
Standards'.
D3549/D3549M,
Standard
Test
Method
for
Thickness
or
Height
of
Compacted
Asphalt
Mixture
Specimens
D5361/D5361M,
Standard
Practice
for
Sampling
Compacted
Asphalt
Mixtures
for
Laboratory
Testing
El
,
Standard
Specification
for
ASTM
Liquid-in-Glass
Thermometers
E29,
Standard
Practice
for
Using
Significant
Digits
in
Test
Data
to
Determine
Conformance
with
Specifications
E879,
Standard
Specification
for
Thermistor
Sensors
for
General
Purpose
and
Laboratory
Temperature
Measurements
El
137/E1
137M,
Standard
Specification
for
Industrial
Platinum
Resistance
Thermometers
2.3.
International
Electrotechnical
Commission
Standard'.
IEC
60751:
2008
Industrial
Platinum
Resistance
Thermometers
and
Platinum
Temperature
Sensors
3.
TERMINOLOGY
3.1.
Definition'.
3.1.1.
failure
point
—
the
load
cycle
at
which
a
peak
occurs
in
the
plot
of
stiffness
multiplied
by
load
cycles
versus
load
cycles,
which
is
indicative
of
the
formation
of
a
crack
in
the
specimen.
4.
SIGNIFICANCE
AND
USE
4.1.
The
fatigue
life
and
failure
energy
determined
by
this
standard
can
be
used
to
estimate
the
fatigue
life
of
asphalt
mixture
pavement
layers
under
repeated
traffic
loading.
The
performance
of
asphalt
mixtures
can
be
more
accurately
predicted
when
these
properties
are
known.
5.
APPARATUS
5.1.
Test
System
—
The
test
system
shall
consist
of
a
loading
device,
an
environmental
chamber
(optional),
and
a
control
and
data
acquisition
system.
The
test
system
shall
meet
the
minimum
requirements
specified
in
Table
1.
Table
1
—
Test
System
Minimum
Requirements
Load
measurement
and
control
Range:
Resolution:
Accuracy:
0
to
5
kN
2N
5
N
Displacement
measurement
and
control
Range:
Resolution:
Accuracy:
0
to
5
mm
2
pm
5
pm
Frequency
measurement
and
control
Range:
Resolution:
Accuracy:
5
to
10
Hz
0.005
Hz
0.01
Hz
Temperature
measurement
and
control
Range:
Resolution:
Accuracy:
-10to25"C
0.25”C
±0.5°C
TS-2d
T
321-2
AASHTO
©
2022
by
the
American
Association
of
State
Highway
and
Transportation
Officials.
All
rights
reserved.
Duplication
is
a
violation
of
applicable
law.
lOMoARcPSD|50251626
5.1.1.
Loading
Device
—
The
test
system
shall
include
a
closed-loop,
computer-controlled
loading
component
that,
during
each
load
cycle
in
response
to
commands
from
the
data
processing
and
control
component,
adjusts
and
applies
a
load
such
that
the
specimen
experiences
a
constant
level
of
strain
during
each
load
cycle.
The
loading
device
shall
be
capable
of
(1)
providing
repeated
sinusoidal
loading
at
a
frequency
range
of
5
to
10
Hz;
(2)
subjecting
specimens
to
four-point
bending
with
free
rotation
and
horizontal
translation
at
all
load
and
reaction
points;
and
(3)
forcing
the
specimen
back
to
its
original
position
(i.e.,
zero
deflection)
at
the
end
of
each
load
pulse.
(Figure
1
illustrates
the
loading
conditions.)
5.1.2.
Environmental
Chamber
(Optional)
—
The
environmental
chamber
shall
enclose
the
entire
specimen
and
maintain
the
specimen
at
the
test
temperature
±0.5°C
during
testing.
An
environmental
chamber
is
not
required
if
the
temperature
of
the
surrounding
environment
can
be
maintained
within
the
specified
limits.
Thermometers
for
measuring
the
temperature
within
the
chamber
shall
meet
the
requirements
of
M
339M/M
339
with
a
temperature
range
of
at
least
-15
to
30°C,
and
an
accuracy
of
±0.
13°C
(see
Note
1).
Note
1
—
Thermometer
types
suitable
for
use
include
ASTM
E879
thermistor
thermometer,
Special
order;
ASTM
El
137/E1
137M
Pt-
100
RTD
platinum
resistance
thermometer,
Special
order;
or
IEC
60751:
2008
Pt-
100
RTD
platinum
resistance
thermometer,
Special
order.
5.1.3.
Control
and
Data
Acquisition
System
—
During
each
load
cycle,
the
control
and
data
acquisition
system
shall
be
capable
of
measuring
the
deflection
of
the
beam
specimen,
computing
the
strain
in
the
specimen,
and
adjusting
the
load
applied
by
the
loading
device
such
that
the
specimen
experiences
a
constant
level
of
strain
on
each
load
cycle.
In
addition,
it
shall
be
capable
of
recording
load
cycles,
applied
loads,
and
beam
deflections
and
computing
and
recording
the
maximum
tensile
stress,
maximum
tensile
strain,
phase
angle,
stiffness,
dissipated
energy,
and
cumulative
dissipated
energy
at
load
cycle
intervals
specified
by
the
user.
5.2.
Miscellaneous
Apparatus
and
Materials
—
A
suitable
saw
for
cutting
the
beams
and
a
mechanism
for
setting
proper
clamp
spacing.
For
loading
devices
that
require
a
glued
nut
for
deformation
measurement,
a
screw,
nut
(suggested
size
M
8
by
1
)
and
block
assembly
for
referencing
the
linear
variable
differential
transducer
(LVDT)
to
the
neutral
axis
of
the
specimen,
and
epoxy
for
attaching
a
target
to
the
specimen
at
the
neutral
axis
are
also
needed.
TS-2d
T
321-3
AASHTO
©
2022
by
the
American
Association
of
State
Highway
and
Transportation
Officials.
All
rights
reserved.
Duplication
is
a
violation
of
applicable
law.

标签： #标准试验 #试验方法 #标准试验方法

摘要：

AASHTO T 321-22 是2022年发布的最新版本标准试验方法，专门用于测定压实沥青混合料在反复弯曲作用下的疲劳寿命。该标准由美国国家公路与运输官员协会（AASHTO）制定，广泛应用于道路工程和材料科学研究领域。通过控制应变或应力模式下的四点弯曲梁试验，该方法能够评估沥青混合料在长期交通荷载作用下的抗疲劳开裂性能，从而为路面结构设计、材料选型及质量控制提供关键数据支撑。本版本在以往基础上可能进行了技术细节优化，以确保试验结果的可重复性与准确性，适用于热拌沥青、温拌沥青及再生沥青混合料等各

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作者：史蒂文 分类：国外协会 价格：18星币 属性：12 页 大小：1.87MB 格式：PDF 时间：2025-12-11

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