Aggregates

The testing of aggregates for civil materials testing under QCTesting scope of accreditation for both MRD & Australian Standards are outlined below. Generally, all materials that are required to be tested are done so to insure they fall between certain tolerances the client is obligated to adhere to.

 Sampling

Is to be carried out in a professional manner to insure utmost accuracy of the finalised results. sampling not conducted to the correct appropriate test method can lead to incorrect results.

Bulk density

This test is an accurate way for working out quantities of civil materials required for earthworks, fill, trenches etc. the test can be performed at various moisture contents and also giving you results in compacted or uncompacted state as well as.

Particle density and water absorption

The test is carried out mainly on road base blends on both the fine and coarse fractions of the material. the higher the particle density the lower the water absorption the better the quality of the material. 

Particle size distribution

The aggregate is put through a nest of various sieve sizes relating to its required specification to insure the correct mechanical interlocking is achieved.

Proportional calliper, flakiness index, average least dimension, crushed faces and weak particles

These tests

All insure the material tested is not to flaky and there is enough angularity in the aggregate to play its important role in maximum mechanical interlocking.

Aggregate crushing value, wet/dry strength variation and los angeles value

These tests are performed to determine the strength of the most predominant aggregate size that is being used in the material by the use of compression machine or the pulverising of the material.

degradation factor

This involves the testing of the intermediate sizes of the material by finding out what fines will be generated by putting the raw material through a self abrasion process.