concrete formwork plywood Impact Tests
However the impact strength of concrete formwork plywood inspected does not directly demonstrate a design parameter, longitudinal and transversal specimens have been prepared in plane and out of plane directions of the panel to perform Charpy tests for it may give an idea about its impact resistance. Since the concrete formwork plywood is porous, the main resistance is put up by the panel coat and in terms of the solubility of experiment results, unnotched specimens have been used in tests.
Longitudinal and transversal samples cut parallel and perpendicular to panel plane with Charpy impact test apparatus are shown in Figure 7 and test results are given in Chart 3. As it can be seen from the test results, impact resistance of the panel is the highest out of plane and in longitudinal direction (strong section); and the lowest in plane and in horizontal direction (weak section). Since the panels subjected to tests are unnotched, it is expected that standard deflection values in Chart 3 are higher than usual, yet, when a notch is made on panels, specimens are tend to weaken and it is likely to cause solubility problems like the ones that can be seen in ‘C’ set results.
Chart 3. Impact test results
|Impact resistance (Joule/m2)|
|In plane||Out of plane|
|Strong section||Weak section||Strong section||Weak section|
Among the test results presented in previous sections, characteristic values of the properties that might be useful when designing the Beizhu panels as concrete formwork are shown in Chart 4. Characteristic values for 15°C and 40°C may be calculated by interpolation method for temperatures between these temperatures. For temperatures out of this range, using extrapolation method without the manufacturer’s approval should be avoided.
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