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Adham, T.
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article
A vacuum-air permeability test for in-situ assessment of cover concrete
Abstract
The transport properties of fluids in the cover layer are the main indicator of the durability of reinforced concrete structures. Many laboratory tests exist for measuring these properties. However, there are relatively few tests that can be used on site. In this paper, the development of a new nondestructive rapid test capable of measuring the air permeability of in situ concrete is described. The new method measures the movement of gas between different holes drilled into the concrete and gives results for the permeability of the concrete and for the volume of concrete that has been tested. A pressure measuring method was developed to measure the pressure inside the concrete by using a piezoresistive pressure transducer and a data logger. Four different techniques were investigated and one preparation technique is recommended for in situ use.