The TQC Karsten Tube Penetration Test contains 3 tubes for horizontal surfaces, 3 tubes for vertical surfaces or at choice any other combination of total 6 tubes , a water bottle, marker and putty to place the tubes leak-tight on the surface. Being a lower energy device, sensitivity is reduced at higher strengths. Aggregate hardness is determined from the standard sample provided along with the instrument. Probes are fired in close vicinity and in a set of three. Failure using either method results if there is any leakage during that 15 minute period. This is the first form of segregation also called coarse segregation.
Karsten Tube Penetration Test
The size and shape of aggregate in the concrete mix also influences the reading of individual probe reading. Standard test method for penetration resistance of hardened concrete, From Table 5 , it can be noted that the strength values are less than the characteristic value specified in the project. Based on the correlation curve and on the respective confidence interval illustrated in Figure 7 , the exposed length of the probe should be at least After 30 seconds, the penetration depth, Pd , is measured.
Cone penetration test - Wikipedia
As the probe penetrates into the concrete, test results are actually not affected by local surface conditions such as texture and moisture content. In this technique a gunpowder actuated driver is used to fire a hardened alloy probe into the concrete. All the information, data and documents are provided by ETCN only for your reference. This is a preview of subscription content, log in to check access. Other machinery for working rubber or plastics, not specified or included elsewhere. It is important to leave 50mm distance from the reinforcement present in the member since the presence of reinforcing bars within the zone of influence of penetrating probe affects the penetration depth. The primary tests performed on a reference portland cement concrete and various concretes containing fly ash and silica fume were: