Behavior of Construction Adhesives Under Long-term Load
U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 1981 - Adhesives - 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).
What people are saying - Write a review
We haven't found any reviews in the usual places.
Other editions - View all
70 days adherends Adhesive A fig Adhesives Under Long-Term applied stress ASTM Stand behavior of adhesives behavior of construction creep behavior creep limit creep modulus creep recovery Creep strain days under load dead load elastomer exhibit type lll F F F Figure five stress levels Forest Products Laboratory function of stress Future studies glueline Honeycombing imately initial loading Joint Joint Joint long-term loading lowest stress levels Madison mastic maximum Percent maximum minutes under load modulus of adhesive moisture number of failures Percent maximum Percent plastics polyvinyl acetate adhesive primary creep 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 construction adhesives three temperatures type lll behavior viscoelastic viscous