Performance of lap splices in large-scale column specimens affected by ASR and/or DEF-extension phase.
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Performance of lap splices in large-scale column specimens affected by ASR and/or DEF-extension phase.

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      A large experimental program, consisting of the design, construction, curing, exposure, and structural load testing of 16 large-scale column specimens with a critical lap splice region that were influenced by varying stages of alkali-silica reaction (ASR) and at least early-stage delayed ettringite formation (DEF), was conducted. This report details the developing expansion from late-stage ASR and at least early-stage DEF in the remaining eight specimens since September 2011 and the structural testing of two of these specimens during the three-year project extension phase. In comparison with the response of the control specimens, specimens exhibiting primarily ASR (and at least early-stage DEF) had similar initial stiffness and behavior up to first cracking, had about a 25 to 35 percent increase in post-cracking stiffness up to yielding, had about a 5 to 15 percent increase in yield strength, and showed no overall detrimental effects on the structural response. The increase in stiffness and strength can be explained by the resulting volumetric expansion of the concrete due to the ASR that engaged the transverse reinforcement for better confinement of the core concrete, and engaged the supplemental post-tensioning reinforcement and the column longitudinal reinforcement to generate additional axial compression load. Although the structural performance of column splice regions with varying levels of ASR and up to some DEF showed no detrimental effects, the vulnerability of the column splices with increased levels of DEF and other developing deterioration mechanisms, such as corrosion, could not be evaluated to date.
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