In-Situ Permeability Testing-A Basis for Service Life Prediction

The premature deterioration of concrete structures is a major problem in many countries across the world and this has prompted the search for a method of predicting service life. In this paper, based on a holistic model relating permeability to durability the experience gained from the use of the "AUTOCLAM" permeability test, which is convenient and easy to use on site as well as in the laboratory, is presented. Details are included of a laboratory study correlating the "AUTOCLAM" permeation properties with the results of carbonation and freezing and thawing tests. In addition, the results of a field study on a motorway bridge are given. It is concluded that in-situ permeability and strength testing can be used to develop durability based design criteria for concrete, and to assess the remaining life of existing structures.