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Hybrid method for concrete cement mixer efficiency
The hybrid method for concrete cement mixer efficiency combines Performance Attributes as Indicators of Efficiency and Composition as an Indicator of Efficiency.
The only reference to a hybrid method was found in a paper by Peterson, which has been adopted in Sweden. The properties selected by Peterson are
• distribution of cement content, fine aggregates and coarse aggregates in the mixer, measured as described in Which can affect concrete mixer machine efficiency?;
• variations in compressive strength;
• variations in consistency as measured by the slump test with increased mixing time.
As many parameters can affect the variations in concrete performance, the method adopted by Peterson was suggested to compare mixers using the same concrete.
Peterson gives three types of concrete including slump 100mm to 150mm, 20mm to 50mm, and Ve-Be 10s to 20s. These concretes were selected by him, and there were no fundamental studies to determine whether they are the optimum mixture composition for the purpose.
He suggested that all three concretes be used with the mixer to be evaluated. Eight samples from each batch should be taken at various times during the concrete discharge, and the properties listed above measured.
A mixer can be considered adequate if the fractional variation between measurements on any of the above properties is less than 6 % to 8 % for each batch of concrete.