Accelerated pavement testing in Slovakia: APT tester 105-03-01

Abstract

This article presents the APT facility constructed and operated by University of Zilina. The machine is called APT tester 105-03-01. The article describes its technical properties, operational capabilities, sensory equipment embedded in the pavement and data gathering procedures. The device has several unique design solutions that make it stand out from similar facilities in the world: (1) The principle of fixed linear APT facility which loading unit is not positioned in a fixed frame, but instead moves itself held only by a guiding rail to better simulate traffic loading. (2) Loading unit consists of fixed and movable frame held by support connected by joints, better simulating suspension like those found on truck axles. (3) The construction of the electric motor, gear box and frequency inverter and its mounting system on the loading unit. Frequency converter controlled acceleration and deceleration ramps and speed during movement. (4) Hydraulic stabilization system stabilizing the movable frame, since the load tends to tip the loading unit in the acceleration and deceleration stage. (5) Autonomous hydraulic system placed on the outer frame able to lift the loading unit and allows for free manipulation without burdening the pavement.