Abstract
Online mixer measurements appear as being essential to the improvement of concrete manufacturing methods, as imposed by new economical and environmental demands. However, the lack of a well-established calibration procedure contributes to the poor reputation sometimes given to these measurements. The original in situ method developed and evaluated herein requires installing a sampler, yet only slightly disturbs the production process. By using this calibration method the mixing power becomes a reliable online indication of concrete water content (measurement standard deviation of 2.85 l/m3). A procedure for improving the regularity of water content in truck mixers has been presented to illustrate the benefit of well-calibrated online water content measurements in batch concrete in a central mix plant. The correction algorithms proposed herein have the potential to be automated and may improve up to 5 times the water content regularity in the truck mixers.
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