Introduction of a Japan Concrete Institute Guideline: Practical Guideline for Investigation, Repair and Strengthening of Cracked Concrete Structures

Abstract

There are many cracked concrete structures worldwide. Although there have been numerous efforts to eliminate cracks, some cracks are very harmful and should be repaired as soon as possible. On the other hand, some cracks are almost harmless. So, a good guideline regarding how to deal with cracks in concrete structures is needed. In this guideline, the practical investigation, repair and strengthening method of cracked concrete structures is discussed. And the detecting subjects are cracks generated immediately after casting and during the service time. This guideline targets on the owners (including managers) of concrete structure and the engineers working for the maintenance of concrete structure. JCI (Japan Concrete Institute) published first version of Practical Guideline for Investigation and Repair of Cracked Concrete Structures in 1980, and then the fourth version titled Practical Guideline for Investigation, Repair and Strengthening of Cracked Concrete Structures—2009 was published. This guideline is very practical when cracks are observed in existing concrete structures, in any other countries as well as in Japan. These three authors led the establishment of this guideline.