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


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

Author(s): A. E. Long, P. A. M. Basheer and F. R. Montgomery

Publication: Special Publication

Volume: 171


Appears on pages(s): 651-670

Keywords: Concrete construction; deterioration; durability; models; permeability; strength; tests.

Date: 8/1/1997

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 their service life. Whilst prediction methods are in their infancy it is evident that in order to improve their effectiveness it will be necessary to develop more reliable and convenient ways of measuring the relevant in-situ properties. In this context it is widely recognised that results obtained from permeation testing give useful information on the likely durability of concrete. In this paper, based on an 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.