Concrete Testing

BCRC's consultants have been involved in the use and development of Non Destructive Testing (NDT) for over 30 years. Frank Papworth commenced his involvement with NDT in 1978 when he managed one of the UK government sponsored programmes in 'Concrete in the Oceans' to assess the performance of marine structures. It included some of the first assessments of NDT's for corrosion measurements including electrical potentials, linear polarisations and resistivity measurements on concrete. Other research projects included these tests and NDT for quality of concrete including Ultrasonic Pulse Velocity (UPV) and Gamma Ray Backscatter. Since 2002 BCRC’s Frank Papworth has focused on seeking out the world best practice in NDT of reinforced concrete structures and, through his company PCTE. this has led to the introduction of many new techniques in Australia.

Non-Destructive Testing (NDT)

BCRC have been at the forefront of introducing new NDT methods to Australia for over 30 years. In the early 80's Frank Papworth bought to Australia the corrosion assessment techniques he had helped research and develop in the UK. These included electrical potential measurements, concrete resistivity measurement. In the mid-80's he was able to bring to Australia the first electrical potential wheel, an instrument he masterminded in the UK for rapid scanning of the corrosion risk. Over the last 10 years he has introduced a broad range of methods including Olsons instruments geotechnical methods, the MIRA 48 transmitter receiver UPE 'body scanner' for concrete.

BCRC today have a wide range of NDT methods at their disposal. Ultrasonic Pulse Echo (UPE), Impact Echo (IE), Impulse Response (IR), Cross Hole Sonic Logging (CHSL) and Ground Penetrating Radar (GPR) are advanced Non-Destructive Test (NDT) methods for evaluation of concrete structures. In each case, stress waves or electromagnetic waves are introduced into the concrete and reflected waves or structure responses are measured. These methods have seen rapid development and acceptance in many countries in Europe, North America and Singapore. All are now used in Australia but not commonly. Use has sometimes been stimulated by legislation requiring assessment of structures at regular intervals. Other advanced techniques such as Spectral Analysis of Surface Waves (SASW) and Interferometric Radar are having less impact in Australia because they have specific application where the market has yet to appreciate the benefits. Added to these there are a wide range of commonly used NDT's in Australia such as Rebound Hammer, UPV, Humidity Probes, Temperature and Maturity, Electrical Potentials, Polarisation Resistance and Pulsed Eddy Current Covermeter. For the last 5 years there is a new focus on development of monitoring systems. Strain and displacement gauges have been used for many years but today emphasis is on corrosion monitoring and systems that can be used for remote monitoring.

Laboratory Tests

BCRC's consultants have expertise in most laboratory tests for concrete.

From the standard strength and shrinkage tests BCRC have a history in speciality testing. BCRC's Managing Consultants have a long history in laboratory testing both from the standard commercial concrete performance tests to specific durability tests.

Fresh Concrete Tests

Bob Munn has been at the forefront of developments in fresh concrete properties. As the technical director for Boral he took overall responsibility for concrete testing of concrete supply for over 20 years.

Making test samples during trial mixBCRC's team are often requested to maage the trial mix stage to ensure the concrete mix is developed appropriately and the testing is undertaken in a proper fashion.

200lt drum test to assess rate of loss of workability of concreteThe rate of loss of slump can be assessed from slump tests repeated at intervals on a concrete batch kept in a 200lt drum. This helps establish the open time for the concrete. Very often the 90minute delivery time in AS1379 is not applicable for a retarded mix or a mix at higher temperatures.

Trial slab cast to assess concrete finish characteristicsBCRC often require that test elements representative of the full scale construction are cast at trial mix stage so that the placing, finishing and curing characteristics of the concrete can be confirmed.

Proceq's Canin Potential WheelBCRC use Proceq's Canin potential wheel for rapid scan surveys of electrical potentials. The advantage is that it gives continuous surface contact to eliminate stabilisation issues. It also logs all results so that the probability method of assessing potential criteria for the structure can be easily established.