How state-of-the-art analyzers can improve quality and margin in concrete batching

Fig. 1: The Walz curve shows the relation between water/cement ratio, cement strength class and expected compressive strength development in concrete Figure: Thyssenkrupp Industrial Solutions
Fig. 1: The Walz curve shows the relation between water/cement ratio, cement strength class and expected compressive strength development in concrete
Figure: Thyssenkrupp Industrial Solutions
Fig. 2: The Polab Linea fully automated lab automation system is installed globally in many cement plants Figure: Thyssenkrupp Industrial Solutions
Fig. 2: The Polab Linea fully automated lab automation system is installed globally in many cement plants
Figure: Thyssenkrupp Industrial Solutions
Fig. 3: Calculated Gaussian distribution curves for concrete mixes with a compressive strength of 30 MPa and a maximum of 5% of the data points below 30 MPa. (B) Same data plotted in a cumulative plot; the dotted line marks 5% outliers. The arrow marks the shift of the target for different values of standard deviation Figure: Thyssenkrupp Industrial Solutions
Fig. 3: Calculated Gaussian distribution curves for concrete mixes with a compressive strength of 30 MPa and a maximum of 5% of the data points below 30 MPa. (B) Same data plotted in a cumulative plot; the dotted line marks 5% outliers. The arrow marks the shift of the target for different values of standard deviation
Figure: Thyssenkrupp Industrial Solutions
Fig. 4: The heat flow diagram (power) shows the heat release over time (left) for two cements. The cumulative curve shows the total heat release at a certain date (right) Figure: Thyssenkrupp Industrial Solutions
Fig. 4: The heat flow diagram (power) shows the heat release over time (left) for two cements. The cumulative curve shows the total heat release at a certain date (right)
Figure: Thyssenkrupp Industrial Solutions
Fig. 5a+b: Rendered images of PolabCal: The picture shows the final layout of PolabCal. The principal components are distributed on the preparation table (left). A robot will handle the samples. The isothermaI I Cal Flex calorimeters are mounted below the preparation table (right) Figure: Thyssenkrupp Industrial Solutions
Fig. 5a+b: Rendered images of PolabCal: The picture shows the final layout of PolabCal. The principal components are distributed on the preparation table (left). A robot will handle the samples. The isothermaI I Cal Flex calorimeters are mounted below the preparation table (right)
Figure: Thyssenkrupp Industrial Solutions
Figure: Thyssenkrupp Industrial Solutions
Figure: Thyssenkrupp Industrial Solutions
Fig. 6: Principal components of the preparation table in PolabH2. The housing and the sample handling are taken from PolabCal Figure: Thyssenkrupp Industrial Solutions
Fig. 6: Principal components of the preparation table in PolabH2. The housing and the sample handling are taken from PolabCal
Figure: Thyssenkrupp Industrial Solutions
Fig. 7: Hydrogen measurement showing hydrogen gas release from a hydrating cement over time. Within short time, the reaction starts and hydrogen release ends after about 30-60 minutes Figure: Thyssenkrupp Industrial Solutions
Fig. 7: Hydrogen measurement showing hydrogen gas release from a hydrating cement over time. Within short time, the reaction starts and hydrogen release ends after about 30-60 minutes
Figure: Thyssenkrupp Industrial Solutions
Fig. 8: Calibration curve for elemental aluminum in cement. The hydrogen release is linear with increasing elemental aluminum conten Figure: Thyssenkrupp Industrial Solutions
Fig. 8: Calibration curve for elemental aluminum in cement. The hydrogen release is linear with increasing elemental aluminum conten
Figure: Thyssenkrupp Industrial Solutions
Fig. 9: Possible QC circuit for improved concrete consistency in a concrete batching plant. In a direct control cycle, only the cement content in concrete is adjusted according to the PolabCal and PolabH2 measurement. Figure: Thyssenkrupp Industrial Solutions
Fig. 9: Possible QC circuit for improved concrete consistency in a concrete batching plant. In a direct control cycle, only the cement content in concrete is adjusted according to the PolabCal and PolabH2 measurement.
Figure: Thyssenkrupp Industrial Solutions
Michael EndersTrained geologist. After receiving his German “Diplom” degree, he became a lecturer at the University of Münster/Germany for technical mineralogy, focusing on high-temperature reactions in combustion systems and the formation and consumption of fly ash in construction materials. Today, he works as a lead consultant and strategic product development expert for the lab automation products at tkIS.
Michael Enders
Trained geologist. After receiving his German “Diplom” degree, he became a lecturer at the University of Münster/Germany for technical mineralogy, focusing on high-temperature reactions in combustion systems and the formation and consumption of fly ash in construction materials. Today, he works as a lead consultant and strategic product development expert for the lab automation products at tkIS.
Jasmin HolzerTrained geoscientist. During her studies at the FAU Erlangen-Nu-remberg, she specialized in petrology and mineralogy. After receiving the Master’s degree, she joined the tkIS R&D center as a mineralogist and expert for instrumental analyses (e.g. XRF, XRD, SEM, calorimetry). A part of her work is to support and develop analytical techniques for polab lab automation.
Jasmin Holzer
Trained geoscientist. During her studies at the FAU Erlangen-Nu-remberg, she specialized in petrology and mineralogy. After receiving the Master’s degree, she joined the tkIS R&D center as a mineralogist and expert for instrumental analyses (e.g. XRF, XRD, SEM, calorimetry). A part of her work is to support and develop analytical techniques for polab lab automation.

The concrete and precast industry will be challenged by ongoing changes in the cement industry. In future, concrete batching will require a better understanding of cement to optimize concrete recipes economically and to maintain concrete conformity. This task can be accomplished with PolabCal and PolabH2.

The concrete and precast industry is confronted with ongoing changes in the cement industry. In near future the CO2 load of cementitious binders will be reduced by lowering the clinker content. However, a lower clinker factor will also reduce reactivity. In future, concrete batching will require a better understanding of cement to optimize concrete recipes economically and to maintain concrete conformity.

This task can be accomplished with PolabCal (cement reactivity analyzer) and PolabH2 (automated hydrogen analyses). These analyzers supply frequent (e.g. hourly) data of cement reactivity and...

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BFT 09/2021

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BFT 09/2021

Ressort:  CONCRETE TECHNOLOGY | BETONTECHNOLOGIE
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