Abstract
Compliance testing of concrete forms an integral part of an overall quality control strategy in the production of concrete. There are two aspects of testing to consider: tests undertaken while concrete is still in the flowing state; tests undertaken when concrete is in the hardened state. Regarding the former, a considerable number of tests are available ranging from traditional, empirical methods such as the slump test, to more sophisticated methods such as nuclear magnetic resonance and microwave absorption. In this paper, attention is directed towards concrete while still in the fresh state, and developments in an electrical method for water content evaluation are presented. It is shown that when bulk resistivity measurements on concrete are normalized by that of the interstitial water phase, then the water content of the fresh concrete can be assessed. (A)
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