Bond Strength of Normal-to-Lightweight Concrete Interfaces
Autor(en): |
Hugo Costa
Pedro Santos Eduardo Júlio |
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Medium: | Tagungsbeitrag |
Sprache(n): | Englisch |
Tagung: | 35th Annual Symposium of IABSE / 52nd Annual Symposium of IASS / 6th International Conference on Space Structures: Taller, Longer, Lighter - Meeting growing demand with limited resources, London, United Kingdom, September 2011 |
Veröffentlicht in: | IABSE-IASS 2011 London Symposium Report |
Jahr: | 2011 |
Abstrakt: |
Structural lightweight aggregate concrete (LWAC) can be used with advantage in new structures, especially in pre-cast components, as well as in the rehabilitation of existing structures. In both situations, the result is a composite structural element, with parts in LWAC and others in normal weight concrete (NWC). Besides material properties, it is also important to characterize the behaviour of LWAC-to-NWC interfaces. With this aim, an experimental study was conducted to characterize the shear strength and the tensile strength of NWC-to-NWC, LWAC-to-NWC and LWAC-to-LWAC interfaces and to compare results with codes’ predictions. A NWC and three different LWAC were considered. Six different types of surface roughness were produced on the concrete substrate and characterized with roughness parameters assessed using the 2D-LRA method, developed by the authors. Slant shear and splitting tests were adopted to quantify the bond strength of the interface in shear and in tension, respectively. |