DEVELOPMENT OF WIND RESISTANCE TEST METHOD OF MECHANICALLY ANCHORED WATERPROOFING SYSTEM WITH ALC SUBSTRATE

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  • ALCを下地とする防水層機械的固定工法の耐風性試験方法の開発
  • ALC オ シタジ ト スル ボウスイソウ キカイテキ コテイ コウホウ ノ タイフウセイ シケン ホウホウ ノ カイハツ

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Abstract

Flat roof systems are subjected to negative wind forces. This effect is especially important when waterproofing membrane is attached to a substrate by spot fasteners of mechanically fastened waterproof system. Wind forces cause fatigue stresses on the system and its reliability, however, is not determined sufficiently. This refers mainly to systems with recently used ALC panel substrate, because ALC's strength is much lower in comparison to regular reinforced concrete substrate. Unevaluated reliability of the system led us to the development of the apparatus capable of fatigue effects investigation. We produced the equipment; its principle is, that negative pressure of wind force is substituted by air pressure of 2965N/m^2 and 8235N/m^2 respectively applied in EPDM bag placed under membrane. Specimens consist of all same parts as actual systems- ALC substrate, fastener with disc and membrane. As a result we can state that failures occurred during the tests are identical to those occurred during typhoons on actual roofs.

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