Behavior of construction adhesives under long-term load
U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1981 - Architecture - 14 pages
Six construction adhesives and a conventional polyvinyl acetate adhesive were placed under dead load at five stress levels and three temperatures for 2 months. The shear slip was measured after 10, 100, 1,000, 10,000, and 100,000 minutes (70 days) under load. The results show four general types of behavior. Three construction adhesives with crosslinking capability had fair resistance to creep and showed evidence that a creep limit might be reached under moderate dead load and environmental conditions. Two adhesives had very poor creep resistance and failed under moderate dead load and environmental conditions. The sixth adhesive was extremely flexible but with excellent recovery capability. A polyvinyl acetate adhesive was not observed to creep under the low humidity conditions of this study. Adhesives showing evidence of a creep limit may be useful for long-term design loads, but further study of their behavior, especially under varying moisture conditions, is required. (Author).
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70 days adherends Adhesive A fig Adhesives Under Long-Term area area area ASTM behavior of adhesives Behavior of Construction bondline slip creep behavior creep limit creep modulus creep recovery Creep strain days of dead days under load dependence of creep elastomer F F F Figure five stress levels Forest Products Laboratory function of stress glueline Honeycombing imately initial loading joint joint joint levels at 80°F long-term loading lower stress lowest stress levels material maximum maximum maximum minutes under load modulus of adhesive nailed joint number of failures phenol plastic deformation plastics polyvinyl acetate adhesive primary creep prolonged load proportional limit recoverable upon removal rigid adhesives secondary creep shear modulus shear slip shear strain Shear strength shear stress shear test areas shims Six construction adhesives strain and creep strain in./in strain under prolonged strain upon initial stress lbf/in.2 stress stress stress test joint three temperatures viscoelastic viscous