Long-term Durability Evaluation of Concrete and Construction of Exposure Environment

本研究的目的是通过全国范围内的试验和当地的气候监测来评估混凝土的耐久性。这项测试从2003年开始，至今仍在继续。通过这些调查，得出了以下结论：a.第一年(1)筑波的气候条件无论是夏季还是冬季都比栗滨严重得多。也就是说，筑波在冬季比栗滨冷，在夏季筑波比栗滨热。(2)因此，筑波暴露的混凝土的抗压强度比栗叶的影响更大。B.从17个地点的气候条件结果来看，第五年(1)混凝土耐久性可以分为几个类别。(2)混凝土生产早期的养护条件对混凝土的长期耐久性非常重要。

The purpose of this study is to evaluate the durability of concrete through the nation-wide testing and local climate monitoring. The test has been started since 2003, and still continuing.From these investigations, following conclusion was clarified.A. For the first year(1) The climate condition at Tsukuba was much severe than that at Kurihama in both summer and winter. In other word, Tsukuba was colder than Kurihama in winter season, and Tsukuba was hotter than Kurihama in summer season.(2) Therefore, the compressive strength of concrete exposed in Tsukuba were remarkably influenced more than that in Kurihama.B. For the fifth year(1) From the results of climate condition at 17 places, several classifications could be done as the influent condition for the durability of concrete.(2) The curing condition at early stage of concrete production is quite important for the long term durability of concrete.