As the use of monitoring technology is attracting attention in the field of maintenance and management of infrastructure, the Research Association for Infrastructure Monitoring System (RAIMS) participated in the SIP (Cross-ministerial Strategic Innovation Promotion Program, FY2014-2018) of the Cabinet Office and compiled information on monitoring technology effective in various situations such as inspection, diagnosis, repair, and reinforcement of infrastructure. JSCE had the results of this initiative evaluated by the Subcommittee for the Promotion of New Technology Application of the General Committee on Infrastructure Maintenance, re-edited them with on-site implementation in mind, and published them as new guidelines for the on-site implementation of monitoring technology for engineers engaged in maintenance and management. This paper presents an overview of these guidelines.

The Technical Committee on the Role and Application of Academic Research in Predicting the Deterioration of Concrete Structures (TC201A) published a committee report summarizing the results of its activities over the past two years. The committee studied ways of linking engineering models used for deterioration prediction as part of maintenance work with the results of sophisticated environmental and phenomenological assessments obtained in academic research. As a result, we were able to classify the relationships between the physical properties of concrete and the deterioration of concrete as well as the rebar corrosion environment, based on the clarification of migration sites with a focus on water. Based on the findings, we proposed a performance evaluation method.

This contribution is a summary of a research project results on radiation-induced deterioration of concrete commissioned by the Japanese Nuclear Regulation Authority (NRA). Neutron irradiation can cause expansion of the minerals in aggregates. This expansion is highly dependent on the mineral type, but is especially large for quartz. When aggregate with a high amount of quartz, which expands due to amorphization by neutron irradiation, is used in concrete, the deterioration of the concrete is significant. Other results showed that the effects of gamma radiation on concrete and concrete components were almost comparable to those after heating and drying. As for the heat and drying effects on concrete, it was found that the strength of concrete is determined by the strength change due to the colloidal nature of cement paste and the cracking around the aggregate caused by the difference in volume change between the aggregate and the paste after drying.