MiQuaTester

Online quality control for concrete mixes

Fig. 1 Example of a control unit for molding sand preparation using the „QualiMaster AT1“ system.

Fig. 2 Values measured with the „QualiMaster AT1“ (top: moisture; center: temperature, bottom: compactibility with tolerance limits).

Fig. 3 Overall arrangement of mixer, „MiQuaTester“, sampling device and sample feedback system.

Fig. 4 Sampling.

Fig. 5 Principle of compacting stiff concrete mixes.

Fig. 6 Central vibration unit.

Fig. 7 Measuring cell at the cleaning station.

Fig. 8 Compacted face mix in the measuring cell (test specimen).

Fig. 9 MiQuaTester user interface.

Fig. 10 Measurement results.

Fig. 11 User interface with display of results.

Fig. 12 Visualization interface.

cmprspring_density_chng_100

Fig. 13 (a-f) Analysis of mix compositions using individual values.

cmprspring_density_chng_100

vibr_harm3_radial_pr_div_normal_pr_18000

vibr_ radial_pressure_harm2_1000

vibr_radial_pressure_harm2_500_sub_200

vibr_acceleration_harm2_18000

Limestone dust Kalksteinmehl

correlation coefficient

Fig. 14 (a-f) Analysis of mix compositions using mean values.

correlation coefficient

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 Well-organized processes ensure high product quality. This clear and simple statement is at the very heart of the DIN EN ISO 9000 standard that supports businesses in their effort to establish a systematic quality management scheme across the entire process chain.

When processing concrete mixes, the actual mixing process that forms part of the entire process chain is of paramount importance. With the aim of achieving a mix design that ensures the specified product characteristics, the „mixing“ process should convert the individual raw materials to a homogeneous, reproducible state. When using natural materials such as gravel, basalt or sand, or in the case of industrially manufactured products such as cement, fluctuations in the quality of the input materials also result in variations in the mix and thus in the quality of the finished product....