Technologies of cold weather concreting were reviewed from both view points of the prevention against damage to concrete due to freezing at early ages and of the assurance that the concrete develops the required strength. The principle points of the potential strength for protection from early-age freezing and the maturity method for estimating the development of concrete strength were discussed. The current status and future of the practice in this field were also described.
Many researches on splitting bond failure in R/C members have been conducted in these ten years. In this report, the findings obtained in the studies, especially on bond strength in high strength concrete, were reviewed and bond strength equations which were adopted in several design guidelines were examined comparatively. Future research needs to establish more rational bond design method were pointed out.
Electorical approach to concrete menbers was introduced. Many research works and actual applications have been carried out regarding Cathodic Protection for protecting corrosin of bars and PC tendons. New electric control methods, such as Desalination and Realkalisation, were also explained. Finally, the research situation of electric application toward concrete itself was mentioned.