Effect of Ambient Temperature on Performance of Grouting Sleeve

The construction quality of grouting sleeve for rebar splicing is a key factor of reliability of assembled precast concrete structure. For this reason, it is essential to understand the impact of curing conditions on the strength development of the grouting sleeve connectors. Six series of specimens with a total of 90 grouting sleeve specimens and 180 grouting samples cured at temperatures of -15, 0, 5, 15, 25, 35°C respectively have been tested at the ages of 1, 4, 7, 14, 28 days. According to the experimental results, the earlystage strength of grouting sleeve specimens is greatly influenced by the ambient temperature, while the 28-day strength is less affected. The relationship between the strength of grouting sleeve connectors and the ambient temperatures is revealed and equations are derived to evaluate the impacts of ambient temperature to the structural performance of the specimens. Suggestions are proposed as guidance to precast concrete construction.