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MATERIALS TESTING

AGGREGATE

Shape Uniformity. Gradings. Polished Stone Value.

Aggregates influence the strength and durability of pavements, making thorough testing before construction essential.

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

AGGREGATE

SERVICE OFFERING

01


Particle Size
Analysis

This test is primarily used in the classification of material against specified grading envelopes. Also known as sieve analysis, this test is done to determine if the aggregates are fit for purpose.


02


Average Least
Dimension (ALD)

The aggregate least dimension (ALD) value is used in surface seal, bitumen and stone application rates and seal designs. The least dimension of an aggregate particle is the smallest perpendicular distance between two parallel plates through which the particle will just pass. The Average Least Dimension (ALD) is the arithmetic mean of all the measured least dimensions of the aggregate particles measured. AG3 is only based upon calculations and not actual measurement.


03


Flakiness
Index

The flakiness index of coarse aggregate is a measurement of the flatness of an aggregate, which affects, among other things, the bulk density of aggregate used for concrete and the performance on road surfacing aggregates.


04


Sand
Equivalent

This test is intended as a rapid field test to show the relative proportions of fine dust or clay-like materials in soils and fine aggregates. The higher the sand equivalent value, the lower the proportion of fine dust in the sample. The test is used to assess the quality of fine aggregate used in concrete and asphalt.


05


ACV (Aggregate Crushing Value)
and 10% FACT (Fines Aggregate Crushing Test)

The test results are used for quality control, by means of particle strength, of aggregate for concrete, surfacing (chips) and asphalt, as well as crushed stone base. The wet and dry results can be used as a guide to indicate aggregates that are likely to break down during handling and mixing or that may generate excessive fines.


06


Polished Stone
Value (PSV)

PSV is to simulate the resistance of the aggregate to the polishing action of vehicle tyres under conditions similar to those occurring on a road surface. The PSV of an aggregate is a measure of the resistance of an aggregate to polishing. Aggregates that retain a significant micro texture after polishing are the aggregates that give good resistance to abrasion and skidding.


07


Bulk
Density

This test is used to determine the relative compaction of a crushed stone base and mix design procedures of concrete and asphalt where the volumetric and water absorption properties of aggregates are required.


08


Apparent
Density

This test is used to determine the apparent density of crushed stone base. The results are used to determine compliance of the density with applicable specifications.


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