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Asphalt Core Cutting Test


Asphalt core cutting test carried out to confirm the quality of the works like the density of the asphalt, the thickness of the layer, air permeability, asphalt compression strength, asphalt mix test, etc. In the above video shown the procedures to take the core sample or specimen and measured the depth of the specimen to determine the depth of Asphalt Pavement. This procedure also knows as the Asphalt core test.
In further, this test could be carried out in remote areas so the arrangement of electricity could become an important factor prior to planning the test, so the power source to be part of the equipment set.
In this blog, we will see the procedure or the method of testing the Asphalt Layer Thickness.

Scope:-

In this method statement, shown the steps shall be carried out to take the core of asphalt using the core drill machine and measure the depth or thickness of the core using Vernier Caliper.

Referenced Document:-

  • AASHTO / TBS (Tanzania Buro of Standard)
  • Project Specification

Significance and Use:-

Sample taken in accordance with the procedure may be used for measuring pavement thickness. Additional testing may be performed as required by the authority.


Tools & Equipment:-

  • Diamond coring tool - Hilti DD 200
  • 100mm Dia. Core bit.
  • Power supply unit
  • Water supply unit - Hilti DWP 10
  • Vernier Caliper
  • Retrieval Device

Material:-

  • Water as a Cooling Agent

Test Sight Location:-

The numbers of cores obtained shall be determined by the test procedure, project specification or authority requirement. The core location shall be determined by the authority.

Procedure:-

  1. For the freshly compacted asphalt materials, the core shall be taken when the material has had enough amount of time to cool to prevent damage to the core.
  2. To accelerate the Coring process, a cooling agent may be used.
  3. Connect the drill with the power supply and water unit agent.
  4. Place the coring machine such that the core bit is over the selected location.
  5. Adjust the level adjustment bolt at the bottom of the drill stand, so the bubble comes in the centre in the level indicator. This will keep the core bit perpendicular to the asphalt surface during the coring process.
  6. Then pump up the water using the water supply unit to aid in the removal of cuttings and to minimise the heat generation due to friction.
  7. Continue the coring operation until the desired depth is achieved.
  8. Collect the cored specimen with the retrieval device.
  9. Measure the depth of the specimen using Vernier Caliper with the authorised personnel. Three or more measurements shall be taken of the specimen and average thickness or depth to be measured of all specimens to be recorded in the particular form for a further report or result procedure.
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Measuring the Asphalt Core Specimen with Vernier Calipers.
10. The hole made from the coring operation shall be filled with a material that will not become dislodged.

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Core hole in Asphalt-Showing the profile of the Asphalt layer.

Results or Report: -

Core thickness or depth shall be reported on standard authority forms with the following information.
  • Date
  • Core reference (chainage and offset distance)
  • Layer description
  • Material type
  • Average thickness



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