DYNA Pull off Tester Determining surface strength of

DYNA Pull off Tester Ø Determining surface strength of concrete § prior to repair § as strength assessment Ø Measuring adhesive strength of § Coatings § Carbon fibre Ø Checking overlays • DYNA Z. . . with digital force display • DYNA Z. . . E with electronic sensor Display of read-outs Visual control of the regular rate of loading § Shotcrete § Toppings § Repairs

Standards Describe a Rate of Load Increase Ø ASTM D 4541 -02, 2002, Clause 5. 1. 5 § ø = 50 mm, <2, 000 N/s Ø DIN EN 24624, 1992, Clause 3. 1 § ø = 20 mm, <315 N/s Ø DIN EN 1348, 1999, Clause 6. 3 § Disc 50 x 50 mm, 250 ± 50 N/s Ø DIN EN 1542, 1998, Clause 7. 4 § ø = 50 mm, 78 ± 20 N/s Ø Pr. EN 12504 -3, in preparation, Clause 6. 2 § 500 ± 200 N/s – not practical Ø ASTM C 90 -01, Clause 7. 4 § 500 ± 200 N/s Ø DIN 1048, 1991, Clause 6. 3. 3 § ø = 50 mm, 100 N/s for ø = 100 mm, 400 N/s Ø ZTV-SIB 90, Annex 2, Clause 4. 6 § ø = 50 mm Rigid substructure Flexible substructure Ø DIN EN 1015 -12 (Mortar) table 2 § ø = 50 mm, 6 to 200 N/s 100 N/s 300 N/s Wide Variety of Requirements

Motor Drive EGS 1800 Power Station EDm Drive EDm BC Battery holder Ø Ensures compliance with standard load rate Connection and Adaptor cable

Appropriate Test Method with test disc DIA 20 mm DIA 50 mm Coring down to the substrate Area 6. 25 larger and defined Without coring Area of stress distribution not clearly defined Coring especially important for fibre-reinforced coatings

Interpretation of test modes Test disc Adhesive Coating Substrate Failure at Adhesive /Coating 3. 1 MPa Expected results: • Tensile strength of concrete 2. 7 to 4. 1 MPa (about 8 -12% of fc) • For adhesive can be less, 1. 0 to 2 MPa Coating/ Substrate