EVALUATION OF THE CHARACTERISTICS OF FILLING MORTAR FOR CONCRETE BARRIER - EFFECT OF ENVIRONMENTAL TEMPERATURE AND CONSTRUCTION METHOD ON SELF-FILLING PERFORMANCE -

Abstract

 According to the 2020 Japan Society of Civil Engineers Infrastructure Health Examination, about 10% of road bridges nationwide require early or urgent measures. In addition, the percentage of bridges passing 50 years since construction is expected to increase rapidly from about 27% in 2019 to about 52% in 2029, 10 years later. In recent years, as an efficient renewal technology for bridge superstructures, girder replacement methods that join precast floor slabs and concrete barriers have been developed. The authors have confirmed that their filler material （non-shrink grout） for the joints that join the floor slabs and concrete barriers satisfies the required performance in a 20°C environment. However, the characteristics when subjected to variations in the field environment have not been elucidated. In this paper, the basic characteristics were determined by indoor experiments, and the field applicability was determined by experiments simulating the field environment. Conclusively, we confirmed the characteristics of the filling mortar for the concrete barrier and formed a recommendation for the specification conditions for actual construction.