Services

Please select an item for more details

CBR Test
Plate Bearing Test
Dynamic Cone Penetrometer
Mexe-Probe CBR
Shear Vane
Schmidt Hammer / Rebound Hammer
Asphalt Testing
Coring
Dynamic Plate Test

CBR Test

CBR TestingThe CBR test is carried out to help in the design of new roads and carriageways.

The CBR test (Californian bearing ratio) is carried out on site with results available almost immediately.

Method

Using standard equipment, a plunger is pushed into the material with the force and penetration being measured.

From this information the CBR value is calculated and reported. With the material strength now established the design of road construction can begin.

Only material of less than 20mm in diameter can be tested using this method. For material greater than 20mm please see Plate Bearing or DCP Testing.

Reports normally e-mailed within 24hours.

(Link to this website for more information)

http://www.standardsforhighways.co.uk/ians/pdfs/ian73rev1.pdf

Top of page

Plate Bearing test

Plate bearing TestThe plate bearing test is carried out to establish the bearing capacity of material being placed or existing excavated material , this could be for design values of structures, runways or crane bases.

The plate bearing test can also be used to establish the insitu CBR Value.

Method

A circular steel plate of varying diameters can used depending of the maximum stone size within the material.

The area for test shall be flat and free from loose material, a dry clean silica sand shall be used to fill any surface voids.

Set up the deflection gauges and apply a small amount of seating load.

Loading can now take place with the settlement at each stage being measured, 5 loadings shall normally be taken.

The information recovered can now be analyzed and reported.

Reports normally e-mailed within 24hours.

Top of page

 

Dynamic Cone Penetrometer

The Dynamic cone penetrometer (DCP) test is carried out to establish soil strength at depths from 800mm to  2 meters below ground level, it can also be used to determine the differing layer thickness of materials

Below ground level.

Method

The DCP uses an 8kg weight being dropped through 575mm on to an anvil which in turn forces a small steel cone through the material, the penetration of the cone depends on the hardness of the ground being tested.

In some cases up to 10 blows of the weight will be needed to move the cone only 5mm but in other materials the cone could move up to 100mm with just 1 blow of the weight. During the test the number of blows and the

Relating penetration is recorded.

The information recovered can now be analyzed and reported.

Reports normally e-mailed within 24hours.

(Link to this website for more information)

http://www.transport-links.org/ukdcp/docs/Technical%20Information%20Note.pdf

Top of page

Mexe-Probe CBR

The Mexe Probe CBR test is a hand held instrument for rapidly assessing the insitu CBR value.

Method.

The probe is pushed through the soil using constant force enabling the technician read the estimate CBR value from the dial.

This variant of the CBR test is only used for cohesive or sandy materials and reads CBR values up to 15%.

Top of page

Shear Vane

The Shear Vane is a hand held instrument used for determining soil shear strength.

Method

The vane of the instrument is pushed into the soil, it is then twisted until the soil “fails”.

The pointer on the dial face will stay in place to enable the reading to be recorded. The unit of measurement is in kPa.

Top of page

Schmidt Hammer / Rebound Hammer

Designed to measure the compressive strength of concrete.

Method

When conducting the test the hammer should be held at right angles to the surface which in turn should be flat and smooth. The top surface film

Of cement should be removed using a grinding stone. 12 readings should be taken over a half meter square area the mean of which is recorded and converted to compressive strength.

Forgotten to take cubes!! Use the Schmidt hammer.

Top of page

Asphalt Testing

All on site and laboratory testing carried out from temperature measurement to texture depth and from sample analysis to wheel tracking.

Top of page

Coring

All coring undertaken from asphalt cores for PRD to Concrete cores for compressive strength.

Top of page

Dynamic Plate Test

The Dynamic Plate test, also known as Light Weight Deflectometer (LWD) is an innovative field test designed to determine the dynamic deformation modulus Evd “Stiffness Values” of soils and unbound fill materials such as capping and type 1 sub-base.

The Dynamic Plate of Light Weight Deflectometer (LWD) will give instant results in stiffness values or “Evd”. This is achieved by dropping a measured weight vertically down a rod until it hits the centre of a circular steel late 300mm in diameter, After the test is completed the maximum displacement of the plate is measured via an accelerometer housed in the plate.

Results can be worked out prior to site departure.

Top of page