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Specialist testing

JFTS' laboratory services can provide a range of specialist construction material tests for your project needs.

We aim to provide a fully comprehensive service including the following specialised construction materials tests:

The PSV test determines how quickly a sample of aggregate will become polished or worn smooth by the repeated passing of tyres. The road surface layer needs to retain its rough texture in order to provide skid resistance for traffic. The higher the polished stone value, the longer the aggregate will hold its resistant texture in road surfacing.

JFTS' PSV equipment includes an accelerated polishing machine, which is designed to imitate the effect of tyres on a road as well as apparatus to test the friction. Samples of aggregate are fixed into small moulds using resin, according to a specified method, together with a control sample of known PSV. Each sample is then subjected to polishing in the accelerated polishing machine, in the prescribed order.

After polishing, the friction test is carried out first on the control samples to calibrate the apparatus and then on each each test sample in turn. PSV results are expressed as categories such as PSV68, PSV62 or PSV56 with the number representing the minimum value for the aggregate. For road surfacing in critical locations a value of at least 62 is often required.

Using our own fully automated SB2010 large scale shear box, we provide specialist testing to determine the shear strength of soil specimens and geosynthetics.

Concrete samples are cut to the required shape, instrumented and loaded in a set sequence to determine the static modulus.

Concrete samples are cut to the required dimensions and a spectral analysis carried out to determine the resonant frequency, which is dependent on the elastic modulus of the material.

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