Leimen, Germany
Leimen, Germany

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Flassak T.,Ingenieurburo Lohmeyer | Reuter U.,Landeshauptstadt Stuttgart | Riffel S.,HeidelbergCement
Betonwerk und Fertigteil-Technik/Concrete Plant and Precast Technology | Year: 2013

A software tool for quantitative assessment of the effectiveness of photo-catalytically active surfaces was developed in collaboration with HeidelbergCement AG. The photocatalytic process of degradation is modeled in analogy to deposition processes. The resistance model used is based on guideline VDI 3782/5. A comparison with measured NOx data at the monitoring station was conducted to establish whether the model chosen would realistically record the concentration level in the street canyon. Simulation took place of an additional calculation to take account of the TiO2 surfaces on the roads, the parking lots, and the sidewalks. Based on calculated results presented at the Hohenheimer Strasse monitoring station, a reduction of the NOx annual average value by approximately 4% can be achieved under the assumed conditions. Annual average reductions of up to 6% are possible for the entire street canyon. Greatest reductions can be achieved near the buildings.


Tabbe M.,HeidelbergCement | Limpinsel W.,Renaturingstation for Raptors and Owls
ZKG International | Year: 2014

Bubo bubo L. is not the name of an exotic pop group, but of one of the world's largest owls. The quarry directly adjacent to the Paderborn plant is 30 hectares in size. On two working levels, limestone-marl rock is excavated down to a depth of around 50 m. This rock was quarried as early as the Middle Ages to build churches such as the Paderborn Cathedral. Today, the rock is used as raw material for the nearby cement plant, whose product range comprises the classical Portland cements, as well as blast furnace slag cements of a wide range of strength classes. The bare rock and 'poor' soil of quarries are home to the last remnant stands of rare plants that cannot exist on the heavily fertilized agricultural terrain. In the case of the young Eagle Owl from Paderborn, an illness was initially suspected, but then it was found that a spine was sticking in its crop. Wilfried Limpinsel was able to heal the wound and rear the owl until it was fully fledged.


Dorfel S.,HeidelbergCement | Luca M.H.M.,German LithoPore Products Pvt. Ltd.
Betonwerk und Fertigteil-Technik/Concrete Plant and Precast Technology | Year: 2013

The aerated lightweight mortar Poriment PRO is a cement-bound mineral mortar with heat-insulating properties based on the LithoPore technology. Poriment PRO is characterized by its flowable consistency and A1 fire rating. It is suitable for indoor use as an insulating material subject to compression, particularly for the insulation of floors and ceilings. This aerated lightweight mortar is a ready-to-use product manufactured at ready-mixed concrete plants. Three additives are needed to produce Poriment PRO, a stabilizer, a protein-specific cross-linking agent and a synthetic protein foaming agent. As an additive, a special cross-linking agent is used that interconnects the synthetic proteins at the molecular level when the separately produced protein foam is added to the paste. The total period needed for production, transport and application should not exceed 120 minutes. The product can either be unloaded directly or, if required, conveyed to the point of application via suitable pumps.


Schmitt D.,HeidelbergCement
Betonwerk und Fertigteil-Technik/Concrete Plant and Precast Technology | Year: 2014

Researchers at the HeidelbergCement Technology Center recently discovered that ternesite actually is a reactive clinker phase. This discovery lays the basis of a novel innovative low-carbon clinker technology. The early age strength contribution of calcium-sulfo-aluminate (CSA) cements is combined with the durability of belite cements to result in this belite-calciumsulfoaluminate-ternesite (BCf) technology. BCT cements from first semi-industrial trials showed high initial heat of hydration, good workability and volume stability of mortars, the possibility to further increase the (final) strength level and improve durability. The further optimization of B performance should lead to the potential of a widespread use in structural applications enabling the replacement of OPC based solutions.


A joint working group 'Quality of concrete products' of the German Cement Works Association (VDZ) and the German Precast Concrete Federation (BDB) discussed on the Influence of the cement on the uniformity of the color shade in gray concrete payers, questions regarding durability testing, and the effect the implementation of DIN EN 1338 has on the paver quality. The tests were performed on single-layer paving blocks, specifically manufactured for this purpose. The objective of the comprehensive tests was to change the properties of the concrete so that an answer to the above-stated questions could be found by making targeted changes to the concrete composition and the adjustments on the block plant. The compressive strength and the tensile-splitting strength as well as the amount of scaling were investigated by means of the slab test, performed in accordance with DIN EN 1338. The results of both tests showed good agreement, despite the long time interval of nearly a year that had elapsed between the two tests.


Ready-mixed concrete subsidiaries of Heidelberger Beton have begun to offer self-compacting filler called TerraFlow. TerraFlow is a material for the backfilling of trenches excavated for pipes of any type, power and telecommunications lines, excavations and infills. This material can be removed again even after its consolidation. Pipelines laid in the trench can be enclosed completely without requiring any additional compaction energy. The suitability of TerraFlow was tested at the IKT (Institut für Unterirdische Infrastruktur Institute for Underground Infrastructure) in Gelsenkirchen. The material was subjected to a comprehensive testing program, which included the identification of the relevant material properties and the subsequent determination of the bedding characteristics under realistic conditions. These tests demonstrated that the material met the specifications defined in the research. The realistic tests carried out showed uniform bedding in circumferential direction.

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