Description:
Bending tests are widely used for measuring the
stiffness modulus and assessing the fatigue resistance
of asphaltic paving materials. Four point bending
tests are included in CEN, AASHTO and Chinese test
specifications. The specimen is a prismatic beam
which is subjected to sinusoidal loading in either
the controlled strain or controlled stress modes.
The Stand Alone Four Point Bending Beam machine
CRT-SA4PT-BB uses advanced servo pneumatic technology
and a high-speed digital data acquisition and
control system together with user-friendly software.
During testing both graphical and tabular data
are displayed on screen and test data is stored
to disc in Microsoft Excel™ compatible format.
The clamps are at 118.5mm centres (the distance
between the outer clamps is 335.6mm (14 inches)
according to AASHTO specifications² but the
height and width of the beam can be varied.
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EN 12697-24 Annex D
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EN 12697-26 Annex B
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AASHTO T321-03 (TP8)
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Frequency range : 0.1 to
30Hz (1)
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Pneumatic stand alone four
point bending machine
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Utilises a low-friction actuator
and high performance ceramic spool servo-valve
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On-specimen measurement system
removes errors due to freame flexure
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Accepts AASHTO beam sizes
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Sinusoidal controlled strain
or controlled stress fatigue test modes
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Constant torque motorized
specimen clamping to eliminate errors due to
localised beam indentation
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Self-contained loading system
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User friendlysoftware for
determination of fatigue resistance and stiffness
modulus
Constant torque motorized specimen clamping
removes errors due to localised beam indentation.
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