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Monitoring water content in fresh concrete by means of microwave probe


Quality assurance when constructing with concrete

 


Water content in fresh concrete is well known as an important parameter in concrete technology. It has a decisive influence on essential material properties, such as processability, strength and durability. Special requirements, for example, uniformity with facing concrete surfaces, also call for constant monitoring and targeted management of this parameter. It is thus, or would be, an advantage to have efficient methods for recording water content in fresh concrete in real time in ongoing production. Various measuring instruments are currently available on the market for this task. In laboratory investigations at the TH Cologne, Germany, a mobile, manually operated probe with microwave technology was selected and assessed as regards concrete technology factors influencing its measurement results. The first results indicate that, under certain technological boundary conditions, this measurement method is basically suitable for estimating and evaluating deviations in water content with successive supplies of concrete.

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CPi worldwide journals are trade journals for the concrete and precast concrete industry that are published in 10 different language editions in more than 170 countries. These trade journals, with their practical editorial reporting on research, production and applications, are specifically addressing the decision makers of the concrete and precast concrete industry.

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