1.1 This test method covers the determination of the extent of an adhered stone to be bonded to its substrate. The shear bond strength value is a quantitative test, but the reporting of the type of failure (cohesive versus adhesive) and the thin-set adhesive coverage (indicating the degree of voids) will be subjective and qualitative. 1.2 Shear bond strength values will be measured in pounds per square inch (psi) and in its metric equivalent kilo-pascals (kPa). The thin-set adhesive coverage will be reported as a percentage. The different types and degrees of failure will be reported as a percentage of the tile surface area being tested as shown in figure 1 - Failure Patterns. 1.3 Units - Units - The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.4 This is a field test for testing adhered stones that have been bonded to its intended substrate. The test using a hydraulic ram and metal plates subjects the adhered stone to a shear force load, parallel and within plane of the stone, to the point of failure. The result will demonstrate the bond strength of the stones attachment to its substrate and will demonstrate which components of the stone assembly have the weakest attachment and what percentage of the stone surface area was caused by the respective type of failure (which material layer; cohesive versus adhesive failure).
Keywordsshear bond, adhered stone, bond strength
Industry standards for bond strength of adhered stones is based on shear bond strength and there is no shear bond strength field test protocol.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
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