Laboratory of pavement

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Goran M. Mladenović, Associate professor
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Laboratory is accredited by Accreditation Board of Serbia since November 2007 

(Certificate of Accreditation No. 01-204)

 

Laboratory for pavement materials has facilities, equipment and staff capable to perform testing of on asphalt binder, aggregate and asphalt mixes for pavements on roads and airports.

 

Laboratory testing

Testing includes empirical properties, as well as simulation tests and fundamental mechanical properties of materials.

 

Testing of asphalt binders

•      standard specification tests of asphalt binder that include: penetration, softening point, Fraass

        breaking point, ductility, elastic recovery, relative density, viscosity, heat loss, insoluble content

        of bitumen in Carbon Tetrachloride, viscosity of bitumen emulsions

•       Rheological properties of asphalt binder that include testing of original, short and long term

         aged binder according to SUPERPAVE methodology:

- determination of asphalt binder viscosity at high temperatures, 

- determination of the rheological properties of asphalt binder (shear modulus and phase

   angle) at high and medium temperatures,

- determination of stiffness modulus at low temperatures

 

Testing of fines and fine and coarse aggregates

•      gradation, plasticity index, stiffening power, Rigden voids, moisture content, shape index,

        coarseness index, methylene blue, sand equivalent, content of organic materials, water

        absorption, density, LA abrasion value, stripping, resistance to frost-thaw

 

Testing of asphalt mixes

•      standard specification tests for asphalt mixes that include Marshall mix design procedure,

        determination of binder and air void content, bulk specific gravity and theoretical maximum

        specific gravity, stability and flow, and gradation of asphalt mixes

•       simulation test: resistance to permanent deformation using wheel tracking device

•       determination of fundamental mechanical properties of asphalt mixes: resistance to

         permanent deformation, resistance to fatigue, dynamic modulus, stiffness modulus.

 

Laboratory equipment

All laboratory equipment allows testing according to Serbian national standards, harmonized European norms, ASTM or AASHTO standards.  

 

Equipment for empiricaly derived tests for asphalt binder:

•       Automatic Ring-and-Ball apparatus for determination of the softening point of asphalt binder,

         EN 1427:2007, ASTM D36-06. AASHTO T53

•       Automatic penetrometer – EN 1426: 2007, ASTM D5-06

•       Fraass breaking point – for determination of Fraass breaking point, EN 12593:2007

•       Ductilometer – for determination of ductility and elastic recovery of asphalt binder, EN

         13398:2003, ASTM D113-07

 

Equipment for testing of rheological properties of asphalt binder:

•       Dynamic Shear Rheometer – for characterization of viscous and elastic asphalt binder behavior

         at medium to high temperatures, ЕN 14470:2005; ASTM D7175-05, AASHTO T-315

•       Rotational Viscometer – for determination of asphalt binder viscosity in the high temperature

         range for manufacturing and construction, EN 13302:2003; EN 13702-2:2003; ASTM D4402-

          06, AASHTO T-316

•       Bending Beam Rheometer – for determination of low temperature stiffness and relaxation

         properties of asphalt binders, EN 14771:2005; ASTM D6648-08, AASHTO T-313

•       Rolling Thin Film Oven Test – for short term ageing of asphalt binder, EN 12607-1; ASTM

         D2872-04, AASHTO T-240

 

Equipment for testing of asphalt mixtures:

•       Marshall compactor – for preparation of cylindrical specimens according to Marshall mix design

         procedure, EN 12697-30/2004; ASTM D6926-06

•       Marshall tester – for stability and flow test according to Marshall mix design procedure, EN

         12697-34/2004; ASTM D6927-06

•       Automatic extractor – for automatic extraction and determination of binder content, EN 12697-

         1:2005; ASTM D2172-05

•       Gyratory Compactor – for preparation of cylindrical specimens, EN 12697-31:2007; ASTM

         D4013-2005

•       UTM 25 – universal testing machine with loading up to 25 kN for testing of cylindrical

         specimens:

- stiffness modulus, EN 12697-26:2004, Annex C; AASHTO TP62-03

- resistance to permanent deformation, EN 12697-25, test method A; AASHTO TP62-03

•       Simple Performance Tester – for testing of cylindrical specimens and determination of:

-  dynamic modulus, EN 12697-26:2004, Annex C; NCHRP 9-29

-  “flow number” and “flow time” tests, NCHRP 9-19

•       Four Point Bending Beam – for testing asphalt beams and determination of:

-  stiffness modulus, EN 12697-26:2004, Annex B; AASHTO TP8

-  fatigue resistance, EN 12697-24:2007, Annex D; AASHTO TP8 

•       Wheel Tracking Device – for simulation test for determination of resistance to permanent

         deformation - rutting, EN 12697-22:2007

 

Field surveys

Visual Condition Surveys – Manual visual condition surveys for pavement rehabilitation design or for implementation of pavement management systems, as well as data processing for automated visual condition surveys. 

Transverse profile - Measurement of rut depth using 1.2 or 3 m straight edge

Macro-texture - Sand patch method for determination of Mean Texture Depth

Micro-texture - Portable Skid Resistance Tester for skid resistance measurements 

Deflection testing – Pavement bearing capacity analysis based on deflection testing using either FWD or Benkelman Beam.

Roughness - Data analysis and processing for roughness measurements performed by either laser profilometer or bump integrator

 

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