Experimental study of time dependent bond transfer length under pure tension in slabs

IOS Press BV
Publication Type:
Conference Proceeding
Construction materials and structures, 2014, pp. 1044 - 1051
Issue Date:
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In a member subjected to pure tension, the stress in concrete is uniform over the whole concrete section. It is assumed that a local bond failure occurs at each crack and there are relative displacements or slip between the steel and the surrounding concrete. Compatibility of deformation between the two materials is thus not maintained. The bond transfer length is a length of reinforcement adjacent to a crack where the compatibility of deformation between the steel and concrete is not maintained because of partially bond breakdown and slip. It is an empirical measure of the bond characteristics of the reinforcement, incorporating bar diameter and surface characteristics such as texture-etc. Based on results from a series of long term tests on eight restrained reinforced concrete slab specimens and accurate measurements of material properties including the creep and shrinkage characteristics of two concrete batches, the ratio of final bond transfer length (d_0^*) (after all shrinkage cracking) to d0 is presented. Experimental results show that shrinkage causes the bond to deteriorate with time.
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