State-of-the-art-report on Non-destructive In-situ Air Permeability
Test Methods for "Covercrete"
By K. Imamoto, K. Shimozawa, J. Yamasaki and S. Nimura
Concrete Journal, Vol.44, No.2, Feb. 2006
- Synopsis
- Durability performance of concrete structures to external aggressive actions strongly depends not only on the cover thickness of the members but also on the resistance of cover concrete "Covercrete". This paper introduces nondestructive in-situ air permeability test methods for "covercrete" mainly based on the draft version of state-of-the-art-report prepared by ROLEM TC 189-NEC "Non-destructive methods to measure air-permeability". The scope of the TC includes (a) Selection of suitable non-destructive test (NDT) methods for the evaluation of the thickness and quality of the covercrete, in view of the durability of concrete structures, (b) Draft recommendations for the application of those test methods, (c) Establish guidelines for the specification of the quality and thickness of the concrete cover, as function of exposure conditions and service life design, and for its compliance control in-situ by NDT methods. In this paper, an outline of the comparative test to achieve the scope "(a)" is also introduced.
- Keywords:
- Concrete cover 'Covercrete', Air Permeability, Non-destructive, In-situ Test, RILEM TC 189-NEC, Comparative Test
