Preliminary Experiments by the Determination of Concrete Mixer

When the filling level in the concrete mixing plant declines js500 twin shaft concrete mixer, the reaction of the cement with the admixture was brought out clearly with the help of dosage. Here, the aggregates were charged with the admixture and the water simultaneously and the cement was charged only after 30–40 s. Due to the charging of the water with the aggregates, the power consumption is briefly greater than in the case of dosage 1 but then again drops faster. After the charging of the cement, the power consumption increases again so that a delayed cement charge will result in an extension of the mixing time.

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The influence of the admixture can be explained in dosage 3. Here, the aggregates were charged with water and cement with admixture was dosed into the mixing chamber after about 30–40 s. The liquid was balanced out after the aggregates had been charged and this was indicated by a decline in the power output peak. An almost constant power consumption results after a mixing time of about 100 s by adding the cement and the admixture. The power consumption declines in proportion to the filling level in the mixer. This is caused by the fact that the admixture, along with the reaction with the cement, must also be distributed in the entire mixture, so that the mixing time for the JS1500 concrete mixer is considerably extended.

One can clearly see that the dosing sequences critically influence the power output development. The reproducibility of the individual variations of the dosing sequences of course becomes difficult as a result of manual dosing. Dosage 1 planetary concrete mixer, that is...