Russian probe goes under cover
A new device for testing concrete is now available from Hammond Concrete Services. The UK 1401 ultrasonic tester was developed in Russia for checking the concrete pylons which carry overhead powerlines.
Main advantages claimed are speed and simplicity. The tester weighs just 400g and requires no preparation before use. Two transducer probes are placed on the surface of the concrete and within 10 seconds a reading appears on the digital display.
The UK 1401 determines the depth of concrete cover, supplying a correlation of ultrasonic velocities in different directions.
Alternatively, it can determine the depth of surface cracks giving the reading in millimetres.
Individual readings can be downloaded to a PC via an optional infra-red port. Calibration is carried out using a reference block.
The unit is battery operated and can take around 8,000 readings over the 100 hour life of the battery.
New software is said to make reinstatement checking with the latest version of the Clegg Impact Soil Tester simpler, faster and more reliable.
The CIST/882/TREND consists of a 4.5kg cylindrical hammer which drops from a controlled height through a guide tube on to a surface. Deceleration is measured in terms of Clegg Impact Value (IV) by a handheld recording unit connected to the hammer.
A digital display on the recording units shows both the drop number and the IV reading which is related directly to soil stiffness and strength. Five drops are required with the fourth drop reading used as the critical IV value.
The tester keeps track of the five readings during the test. If a failed reinstatement is detected, the operator is alerted by a warning on the display.
Protimeter' uprated mini moisture meter incorporates a range of design refinements said to make it simpler to use.
The instrument fits snugly into the hand so it can be used effortlessly for long periods and the new bright display is easy to read. If the instrument is accidentally left on, it automatically switches off after five minutes, thus conserving battery life.