Iab Institute For Angewandte Bauforschung Weimar Ggmbh

Germany

Iab Institute For Angewandte Bauforschung Weimar Ggmbh

Germany
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Muller A.,Iab Institute For Angewandte Bauforschung Weimar Ggmbh | Palzer U.,Iab Institute For Angewandte Bauforschung Weimar Ggmbh | Rubner K.,BAM Federal Institute of Materials Research and Testing | Schnell A.,Bauhaus University Weimar
Betonwerk und Fertigteil-Technik/Concrete Plant and Precast Technology | Year: 2013

Comprehensive investigations were carried out on lightweight aggregate concretes with closed structure to prove the fitness of the lightweight granules for the intended use. The lightweight aggregate concretes were manufactured with a grading curve of A/B 8, a cement CEM I 32,5 R and a water-cement ratio of 0.45. The lightweight granule replaced the entire aggregate beginning with a particle size of 2 mm. Below 2 mm, natural sand was added. Additional water absorption of the porous granules was taken account of by appropriate wetting. The investigation of such hardened concrete properties as strength, modulus of elasticity, shrinkage behavior, carbonation, water penetration depth, and frost resistance showed that all of the concretes made with the newly developed lightweight granules attained comparable values to those of the reference materials made with conventional expanded clay. The results of the project show that a recycling material previously used only for subordinate purposes can be the basis for a high-quality product.


Leydolph B.,Iab Institute For Angewandte Bauforschung Weimar Ggmbh | Schiecke S.,Iab Institute For Angewandte Bauforschung Weimar Ggmbh | Palzer U.,Iab Institute For Angewandte Bauforschung Weimar Ggmbh | Hagedorn T.,Iab Institute For Angewandte Bauforschung Weimar Ggmbh
Betonwerk und Fertigteil-Technik/Concrete Plant and Precast Technology | Year: 2014

Assessments of the corrosion resistance of building materials are currently focusing on such fields of application that are associated with biogenic sulphuric acid corrosion (BSA). In particular, damages occurring at wastewater treatment plants attract more and more public attention, especially in times of increasing maintenance and repair costs for infrastructure networks. Today, biogas is understood as a renewable and sustainable energy source being produced at many locations throughout Europe in the meantime. Along with the growing number of biogas plants, the number of silage trucks continues to grow too. In this regard, an almost unnoticed, additional damage pattern emerges, apart from the BSA problem, which is similar to that of BSA in its mechanism of action and the potential of damage. The investigations carried out at such plants revealed that precast concrete elements used for silos built in the 1970s and 1980s to some extent show fewer damages despite the long service life than new buildings after being three to four year in operation.


Berger W.,Iab Institute For Angewandte Bauforschung Weimar Ggmbh | Palzer U.,Iab Institute For Angewandte Bauforschung Weimar Ggmbh
Betonwerk und Fertigteil-Technik/Concrete Plant and Precast Technology | Year: 2014

The inside surfaces of pipes have a major influence on the flow pattern in pipelines, which is why they should be as smooth as possible to keep losses due to pipe friction to a minimum whilst ensuring that no or only little sedimentation occurs in continuously operated sewers. However, such surfaces are effective only to a limited extent because certain constituents of the wastewater will deposit on the surface if the flow rate within the sewer falls below a critical threshold. Publications on the veins of insects provided the starting point to develop the idea of optimizing the inside surfaces of pipelines in order to influence the transport of fluids and solids in a targeted fashion. Because of the positive outcomes achieved with soft lining materials, a project currently applied for is to develop both a lining material and an installation technology that are suitable for use in concrete pipes whilst providing sufficient resistance against the high loads acting in the sewer network.

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