Water plays a decisive role in the performance of concrete structures from construction to durability, including the time to finish the concrete substrate, indoor humidity, carbonation, chloride attack, frost damage, alkali-aggregate reactions and corrosion of reinforcement. Recent trends in the life cycle management of infrastructures need methods to measure water content of concrete in reliable, accurate and ease-of-use. This paper reviews studies and applications of methods for water content of concrete structures in terms of their measuring principles, applications and future prospects. Methods of measuring electric resistance and capacitance using embedded or contact electrodes are first dealt with and the results are evaluated with reference to the authors’ experiments. Next, the relationship between relative humidity measurement and water content is discussed both on the borehole method and sheet covering method. Particularly, the impermeable sheet covering and coloring paper methods are easy, non-destructive and applicable to on-site decision for timing the finished construction, while no information is given on the water content inside of the concrete. Finally, the neutron method and direct core sampling method with low abrasion heat are briefly discussed.
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