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Materials Testing

Asphalt & Bitumen

Full Marshall Control. MMLS. Coring and Gyratory tests.

This diverse range of testing methods ensures the strength and readiness of asphalt and bitumen used in roadworks and other applications.

Our accredited laboratories and mobile facilities are equipped to perform the following asphalt testing services according to testing standards set by ASTM, SANAS, BSI and more.

Asphalt & Bitumen

SERVICE OFFERING

01


Asphalt briquettes
for Marshall test

Compaction of hot mix asphalt material into cylindrical briquettes which allows the material to undergo Marshall analysis tests.


02


Marshall stability,
flow and quotient

Determining the stability and flow of compacted asphalt briquettes with an electronic plotter. Marshall stability is related to the resistance of bituminous materials to distortion, displacement, rutting and shearing stresses.


03


Bulk density and void content
of compacted asphalt (BRD)

Used to determine the density of the hot mix asphalt mix after compaction.


04


Theoretical Maximum
Specific Gravity

A hot mix asphalt sample is placed into a pycnometer and a vacuum pump removes all air from the sample to determine the mix density. This result, coupled with the result obtained from the BRD, is used to calculate the voids in the hot mix.


05


Soluble binder content
and particle size analysis

Used to determine the percentage of binder in the hot mix asphalt sample. Sample is “washed” with a suitable solvent and processed through a centrifuge to separate the dissolved liquid and binder mixture from the fine aggregates to ensure no aggregate material is lost to perform an accurate sieve analysis on the sample.


06


Bitumen content of
asphalt mix

Used to determine the percentage of binder in the hot mix asphalt sample by means of an ignition oven. A sample is placed into the oven and the bitumen is physically burned off. The weight of the sample after the burning process is then compared to the starting weight to determine the loss.


07


Binder content
of mixtures

This method is used to accurately determine the net bitumen content of a slurry mixture.


08


Low- temperature
and dynamic viscosity

Viscosity is the measure of resistance of flow or shear of a fluid. This test is used to determine the shear-rate and apparent viscosity of bitumen.


09


Rolling
thin film oven

This test method is intended to measure the effects of heat and air on a thin film of bitumen. It aims to simulate the hardening properties of bituminous binders during the mixing, transportation and compacting process.


10


Elastic
recovery

This test method is used to determine the elastic properties of a polymer modified bituminous binder.


11


Ball penetration
and resilience

This test measures the relative hardness or consistency of bitumen rubber blends.


12


Compression
recovery

This test is used to measure the contribution made by the rubber crumbs to the bitumen rubber blend’s ability to return to its original shape after compression.


13


Flow
test

This test is used to measure the flow properties of bitumen at high temperatures.


14


Ball penetration
test

The ball penetration test is used to simulate the embedment of stone chips that occurs during construction and under traffic loading.


15


Texture depth
measurement

This test is used to determine the texture of a road surface (the roughness).


16


Marvil
test

This test is used to determine the in-situ water permeability of bituminous surfacing. The permeability of that bituminous layer provides an indication of the interconnectivity of the voids in the layer. The results provide an indication of the material’s susceptibility to the ingress of water.


17


Certification of
a binder distributor

These tests are conducted for the fit for purpose certification of a binder distributor (Sprayer tanker). Tests are conducted annually and include: certification of a binder distributor (BT 20), validation of binder distributor dipstick (BT 21), power and speed indicator test (BT 22), pump system performance (BT23) and transverse distribution (bucket test) (BT 24).


18


Penetration of
bituminous materials

The needle penetration test is used as a measure of consistency, higher values of penetration indicate softer consistency.


19


Softening point
of bitumen

Bitumen is a viscoelastic material without sharply defined melting points. The softening point is useful in the classification of bitumen as one element in establishing the uniformity of receiving shipments of binder.


20


Water
content

This test method measures the amount of water present in the emulsified asphalt as distinguished from either bitumen or petroleum solvent.


21


Hamburg abrasion
testing

Specimens prepared in the laboratory or cores from field samples can be tested under simulated conditions in the laboratory to determine their susceptibility to rutting and moisture against different load, temperature and moisture settings.


22


Gyratory
compactor

Gyratory compaction is used for precision compaction of asphalt samples to a specific target mixture or void content. Clients can get more precise readings of their samples to determine the mixture compatibility and mixture design properties.


23


Model Mobile Load
Simulator (MMLS 3)

An accelerated pavement testing tool applying realistic rolling wheel contact stress, to simulate traffic, moisture and temperature on the pavement layer that results in surface.


24


Rolling
straight edge

This method is used to determine the rideability of a specific road surface area and measure the transition between where processed sections join.


25


Walking
profilometer

Smaller scale application to measure surface roughness, texture and transition irregularities, and surface rutting.


26


Falling Weight
Deflectometer (FWD)

The Falling Weight Deflectometer (FWD) is currently the most practical system for accurately measuring a pavement’s deflection response when it is subject to a dynamic load. It is also a non-destructive testing technique.


27


International
Roughness Index (IRI)

Pave® Prof V2.0 is a modular system that uses 3D laser sensors to measure pavement profiles for applications such as highways and runways. It measures surface roughness, texture and rutting. It is capable of real-time continuous measurements of longitudinal and transverse profiles, rut depth and macro texture. These values can be used to calculate ride comfort, surface friction and surface noise generation to international standards.


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