MIT-SCAN-T3 Asphalt & Concrete Pavement Thickness Test

Overview

MIT SCAN-T3 Pavement Thickness Test – Asphalt & Concrete

  • Pavement thickness test – non-destructive test (NDT)
  • Full depth or layer by layer thickness measurement for asphalt, concrete and unbound material
  • Accuracy of the MIT SCAN is ยฑ (0.5% of measured thickness + 1mm).
  • Meetsย ASTM E3209 / E3209M โ€“ 20ย andย EN 12697-36:2003ย (Hot Mix Asphalt โ€“ HMA) standard

Applications

The consistent application of a required depth of concrete, asphalt or unbound material for pavements is important to road construction contractors and their clients, the road authorities and councils who need to verify that the asphalt or concrete has been laid to the required pavement thickness. The MIT-SCAN-T3 pavement thickness test enables you to perform this task efficiently.

This test is only suitable for construction where reflectors can be inserted into the pavement.

The MIT SCAN-T3 can be used directly after the application and rolling of hot asphalt. This means that it can be used to measure partial layer thickness to ascertain exactly how much material is required to bring the pavement thickness up to the final required level. It can also be used on milled surfaces.

The MIT-SCAN-T3 can also be used immediately after concrete has been laid. As soon as you can walk on the concrete, you can measure the concrete thickness.

The MIT-SCAN-T3 fromย MIT Mess- und Prรผftechnikย usingย Magnetic Imaging Tomography technique (MIT), a technique which uses reflectors inserted into the pavement during construction, according toย ASTM E3209 / E3209M โ€“ 20ย andย EN 12697-36:2003ย (Hot Mix Asphalt โ€“ HMA).

Advantages

The accuracy of the MIT SCAN of ยฑ (0.5% of measured thickness + 1mm) compares favourably with surveying or coring. The equipment compensates for changing environmental conditions. This includes wet road surfaces or magnetic aggregates.

Other advantages of the MIT-SCAN-T3 include:

  • Non-destructive measurement (NDT) so reduces or eliminates coring
  • GPS-System to immediately determine and record your position integrated with Google Maps
  • Fast and repeatable
  • Easy data management for storage, presentation and geo-positioning using the PC-based software
  • Light, hand held device, take-apart for transport
  • No impact from wet road surfaces or magnetic aggregates
  • Common reflectors allow measurements from 15mm up to 500 depths
  • Only rough location of reflectors required before measurement
  • Measurements possible on steel reinforced bridges
  • Calibration for customer specific reflectors possible
  • Can be integrated into automatic reflector laying and thickness measurement systems

Here you will find more detail aboutย how the equipment worksย in practice.

MIT-SCAN-T3 Calibration, Service and Spare Parts

Insitutek are proud to represent MIT Mess- und Prรผftechnik MIT-SCAN-T3 in Australia, New Zealand and the Pacific Islands and provide a high level of client support.

We offer a complete spectrum of services including after-sale technical support, servicing, repairs, and calibrations.

To find out more, Contact Us.

How it Works

The MIT-SCAN-T3 is used for both concrete thickness and asphalt thickness pavement applications.

It uses Magnetic Imaging Tomography (MIT), a technique based on pulse induction technology which uses reflectors inserted into the pavement during construction.

The measuring results arise from an analysis of magnetic fields. Those so called answering fields are generated from eddy currents, which have been induced inside aluminium or zinc-plated steel reflectors as a reaction to a pulsed magnetic field. This Magnetic Imaging Tomography (MIT) measuring method is based on the principle of electro-magnetic tomography. Crucial innovations are the application of a sensor field and the analysis of the spatiotemporal answering signal.

The following reflectors are typical:

  • Asphaltโ€“ 7cm diameter Aluminium
  • Concrete โ€“ 30cm diameter Steel

The pulse induction technology leads to a high noise immunity and a wide measurement range. Probe head and electronic housing are connected through a take-apart central pipe.

A sensor field collects answering signals of metal reflectors. The analysis of the spatiotemporal gradient, which uses the methods of the electromagnetic tomography, avoids subjective measurement errors. A search mode allows for the very effective location of a reflector in a 2 m wide pavement corridor, while the device is moved on a meander shaped path at 10 cm above the road surface. The presence of a reflector is shown as well on the display as through an acoustic signal. Immediately after the measurement, the results are displayed.

Videos

Asphalt Thickness and Concrete Thickness Test – NDT – MIT-SCAN-T3

Documents

Category

Topic

Publication Date

Measurement of asphalt thickness MIT SCAN T3

Author: Iain McIver, Richard Jackett

Date: 30 June 2020

Pavement thickness evaluation with non-destructive methods - Comparison study - Marek Truu - Baltic Road Conference Aug 2017

Pavement thickness evaluation with non-destructive methods - Comparison study - Marek Truu - Baltic Road Conference Aug 2017

Author: Marek Truu - Teede Tehnokeskus

Date: Aug 2017

So far coredrilling (8 cores/km) is predominantly used for evaluating pavement layer thickness in taking over process of new pavements in Estonia. Coredrilling is accurate but time consuming, costly and destructive method, providing very limited information about thickness being very local. New promising nondestructive methods have been implemented worldwide, promising to eliminate shortcomings of coredrilling method. ND GPR already in use for air-voids measurements.

Based on literature review, following methods and devices were selected for field test:

  • Ground Penetrating Radar
  • Eddy Currents in Reflectors (MIT-SCAN-T3)
  • Geodetic measurements
  • Coredrilling & thickness measurement in laboratory

Based on literature review, Ground Penetrating Radar and technology based on measuring Eddy Currents in Reflectors (with MIT-SCAN) were selected for field tests. There are advantages and disadvantages for both technologies, however guaranteed results in measuring upper layer thickness can be provided only through measuring Eddy Currents in Reflectors

It is suggested to introduce technology of measuring Eddy Currents in Reflectors for reliably measure single layer thicknesses nondestructively, with same accuracy and lower cost per measurement (including reflector installation) compared to destructive coredrilling and with recovery option to check depth of reflector with coredrilling.

Description of the Measuring Method MIT SCAN T3 042016

Author: MIT Mess- und Prรผftechnik GmbH

Date: April 2016

TP D-StB 12 Technical Specifications For Determining Pavement Layer Thicknesses In Road Construction (Asphalt & Concrete Applications)

Author: BaST

Date: 2014

Florida DOT Comparison of Methodsย for Concrete Pavement Thickness Measurement 022013 Construction Conference

Author: Abdenour Nazef

Date: 19 February 2013

Determination of Using the Magnetic Imaging Tomography Technique โ€“ TechBrief Concrete Sept 2009

Date: September 2009

Method to Determine Pavement Thickness using Magnetic Tomography Technology โ€“ March 2007 โ€“ California Department of Transportation (Concrete Application)

Author: California Department of Transportation

Date: March 2007

Brochures

Brochure MIT SCAN T3 Pavement Layer Thickness Test for Asphalt, Concrete and Unbound Materials 032023

Brochure MIT-SCAN-T3 Layer Thickness Test for Asphalt Concrete and Unbound Materials

Blogs

One of our innovative clients, WSP, was looking for a way to assess the thickness of asphalt layers during the construction process and easily report their findings. They wanted to do this non-destructively and in a manner that seamlessly integrated with the construction process. These requirements and the accuracy needed led them to theย MIT-SCAN-T3, an […]

Credentials

The MIT-SCAN-T3 product is used by organisations in the following categories:

  • Road Construction companies
  • Geotechnical Testing specialists
  • Road and Transport Authorities
  • Universities and Research Institutions

To find out more,ย Contact Us.

The MIT-SCAN-T3 is manufactured in Germany by MIT Mess- und Prรผftechnik GmbH. MIT stands for Magnetic Imaging Tools. Over 400 units have been sold and the MIT-SCAN-T3 has been in production since 2005.

MIT Mess- und Prรผftechnik GmbH
Gostritzer Str. 61-63, D-01217 Dresden, Germany
www.mit-dresden.de

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