1. Introduction
InstroTek Auto_SCB
TM
is a load frame designed for conducting
semi-circular bend (SCB) tests described in AASHTO TP 124
(recommended by University of Illinois, I-Fit) and ASTM D8044
(recommended by Louisiana State University). Auto_SCB
TM
can
also perform a variety of mechanical property tests on asphalt
mixtures such as IDT strength, Marshall Stability, and IDEAL-CT.
The load and displacement parameters measured by the
Auto_SCB
TM
can be used to predict cracking performance of
asphalt mixtures. The Auto_SCB
TM
measures the load, the
specimen vertical displacement with a high accuracy linear
variable displacement transducer (LVDT) system, and an
encoder for the displacement of the ram of the load frame.
The loading sequence is fully automated with microprocessor
control of the loading ram such that the seating loads, rests,
unload rates, and loading rates are all performed consistently.
The load and displacement are measured with a built-in data
acquisition system. Also, an SCB jig has been developed to
improve repeatability of the test. All the functions of the
Auto_SCB
TM
system are automatically controlled and the results
are displayed on a touch screen.
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