www.proceq.com 1 2 3 4 L pa 1 2 3 4 permeability tester Fast, reliable and non-destructive measurement of the permeability of concrete structures The permeability of concrete at the surface (concrete cover) has been recognized as a major factor in determining the durability of concrete structures. Many specialists emphasize the importance of this property and the possibility of measuring it reliably - not only in the laboratory but also at the building site. P ermeability measurements The particular features of the TORRENT method are a two-chamber vacuum cell and a pressure regulator, which ensure that an air flow at right angles to the surface is directed towards the inner chamber. This permits the calculation of the permeability coefficient kT on the basis of a simple theoretical model. The unit has a user-friendly menu technique and measures the pressure increase as a function of time according to a specific sequence. The associated data is automatically collected by the display unit and the permeability coefficient kT and the depth of penetration L of the vacuum are calculated. The measurement takes 2-12 minutes, depending on the permeability of the concrete. In the case of dry concrete, the quality class of the concrete cover can be read from a table using the kT value. In the case of moist concrete, kT is combined with the electrical concrete resistance ñ (rho) and the quality class is determined from a nomogram. The TORRENT permeability tester is based on investigations which were carried out by the research centre of „Holderbank Management and Consulting Ltd.“, Switzerland. The result of these measurements, which were made in the laboratory and on the building site, are in good agreement with laboratory methods, such as oxygen permeability, capillary suction, chloride penetration, etc. Standard: SN 505 262/1, Annexe E Air flow to the two chambers of the vacuum cell Inner chamber, pressure pi Outer chamber, pressure Po Po = pi Air flow to the outer chamber Air flow to the inner chamber L = Depth of penetration of the vacuum In the case of moist concrete, the measured permeability is lower, i.e. the concrete quality seems to be too good. This effect can be corrected using the electrical resistance ñ of the concrete. The concrete quality class is determined from kT and ñ in a nomogram. Nomogram for concrete quality class Atmospheric pressure pa

www.proceq.com T echnical Information Basic Unit Display Unit with nonvolatile memory for 200 measured objects DISPLAY: 128 x 128 graphic LCD INTERFACE: RS 232 or with adapter to USB SOFTWARE: Integrated for printing out measured objects and transmission to PC BATTERIES: 6 1.5 V, LR 6 batteries for 60 hours operation TEMPERATURE RANGE: -10° to +60° C CARRYING CASE: 325 x 295 x 105 mm, total weight 2.1 kg Control Unit with membrane pressure regulator and pressure sensor VACUUM CONNECTION: small flange 16 KF CARRYING CASE: 520 x 370 x 125 mm, total weight 6.3 kg The unit is operated with a commercial...