Many thanks to all who came to visit us at the SEHAUC event held at Sandown racecourse.

We had a very successful day with many enquiries relating to our services and particularly compaction testing and using DCP.

One particular question which was asked in relation to this device was whether it had a negative effect on recycled or modified materials where penetration has been undertaken. The answer is absolutely not as such materials are stabilized and not of a bound nature and this can be confirmed by geotechnical classification. Where using flowable SMR’s the device will penetrate, but is not recommended after curing time has elapsed.

Standard bearing plate and impact hammer tests will only supply information to depth directly in relation to disc or hammer diameter, and this is a primary reason why Standard Dynamic Cone Penetrometers were developed for ground resistance or compaction at depth. Nuclear density guages will also supply information to certain depths, but require calibration at site to be tested.

The primary issue with all backfill materials is compaction requirement, and if layered reinstatement has not been undertaken, dissipation of force from compaction equipment will occur beyond effective depth. This is clearly demonstrated where single layer backfill has occured. To see evidence of this please visit the following link http://www.corehard.com/index.php/uk/28/panda-results