THE CORROSION‐PROTECTION OF PRESTRESSED CONCRETE PIPES

1965 ◽  
Vol 12 (3) ◽  
pp. 7-14
Author(s):  
J. Franquin
Keyword(s):  
Corrosion Protection ◽  
Prestressed Concrete ◽  
Concrete Pipes

Continuous Thickness Control of Centrifugally Cast Concrete Pipes by an Ultrasonic Echo-System

1968 ◽  
Vol 1 (2) ◽  
pp. 50-52
Author(s):  
J. A. de Raad ◽  
A. de Sterke
Keyword(s):  
Prestressed Concrete ◽  
Large Diameter ◽  
Ultrasonic Pulse ◽  
Centrifugally Cast ◽  
Concrete Pipes ◽  
Ultrasonic Echo ◽  
Cast Concrete ◽  
Large Diameter Pipes ◽  
Pulse Echo ◽  
Made In

Large diameter pipes of prestressed concrete with a length of 10–20 ft. used for water transport are made in rotating moulds. To control the thickness of these concrete pipes during production, an ultrasonic pulse-echo system mounted at the end of the feeder is used. Basically, the air gap between feeder and inner pipe wall is continuously measured, whereby deviations due to misalignment of the feeder are electronically compensated. A prototype version of the system has proved its usefulness. An accuracy of ±5% of the nominal wall thickness was obtained.

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