Tie Bar /Dowel Bar Alignment & Positioning Test MIT-DOWEL-SCAN Overview
The MIT-DOWEL-SCAN Tie Bar Alignment & Positioning Test from MIT Mess- und Prüftechnik GmbH is a measuring system for the non-destructive and accurate measurement of tie bar / dowel bar position and alignment in concrete pavements, according to ASTM E3013.
The advantages include:
- Non-destructive test (NDT) – no need to do coring to measure depth
- One person operation
- Measurement can be taken extremely quickly (less than one minute per joint across several lanes)
- Results are immediately seen on a graphical display on the screen for quality control purposes
- Positioning and alignment can be checked as soon as a person can walk on it after concrete placement
- As the results are immediately available, it allows the contractor to take corrective action immediately, making adjustments during the paving process
- Embedment depths, misalignments & translations are determined precisely, even on rain-drenched surfaces
- Under normal conditions, depths as well as horizontal and vertical misalignments can be determined with an accuracy of ±4 mm and side shifts with an accuracy of ± 8 mm
- Used to evaluate new and existing joints.
- Basket joints can be evaluated if the shipping wires are cut.
The MIT-DOWEL-SCAN is delivered as a complete system ready to use. The measuring vehicle is equipped with an operating unit, a laser unit, MagnoProof software package, manuals and a solid transportation case.
- Quality Control by Contractors for checking their installation process
- Highway construction of plain concrete pavements
- Quality Assurance by Owners for accepting completed facilities
- Plain Concrete runways, taxiways & ramps at airports
- Concrete Sea Container storage & staging areas in port facilities
- Forensic Investigations of failing joints in existing pavements
Properly aligned and embedded dowel bars are vital for load transfer in jointed plain concrete pavements. Significantly misaligned tie bars may lead to joint locking which can cause slabs to crack. Improper placement (embedment) of tie bars leads to decrease in load transfer efficiency, which can result in faulting and other pavement distresses.
Joints in concrete pavements of highways, airport runways and container areas are exposed to stresses and strains due to traffic and temperature variation. Steel dowel bars, reinforcement bars and tie bars are built into joints, to support the transfer of loads across the joints and to maintain the elevation of adjacent slabs at the joints. The type and the number of dowels and tie bars as well as their accurate positions and tolerable displacements are accurately determined, to ensure the long-term performance of the joints.
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