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List of products by author: R. Breitenbücher
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Dewatering and infiltration behaviour of annular gap grouts
Abstract: In mechanized tunnelling with segment linings, the annular gap between segment and soil must be filled instantaneously with an adequate grouting mortar. Thus, two contradictory requirements are demanded on annular gap grouts: On the one hand optimal flow properties lasting for several hours and sufficient stability against segregation, on the other hand the rapid development of shear strength...
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Key performance parameters of single-component grouting mortars in mechanized tunnelling – systematic laboratory...
Abstract: In mechanized tunnelling a so-called annular gap with a width of up to 20 cm remains between the segment lining and the surrounding soil. Soon after mounting of the segment rings, the annular gap must be filled with an adequate grouting mortar to stabilize the tunnel lining and to minimize settlements of the ground surface. Thereby, two contradictory requirements are demanded on such annular...
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Load-bearing and Bonding Behavior of Hybrid Concrete Tunnel Lining Segments
Abstract: Concrete damages occurring frequently in the peripheral zones of segments cannot be prevented by using conventional steel reinforcement due to the adherence of minimum concrete cover. Based upon this fact, a new concept has been developed to manufacture hybrid concrete segments with a so-called “fresh on solid” production procedure. In this procedure, tailor-cut precast components made of...
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Steel fiber-reinforced concrete for precast tunnel lining segments
Abstract: Precast tunnel lining segments are often subjected to critical impact and concentrated loads especially during the construction stage. The peripheral regions of segments, such as edges and corners, are usually exposed to significantly higher stresses than the interior. Under such high stress concentrations, concrete damages in the form of cracking and spalling are very likely to occur in these...
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Test Methods for Verification of Suitability for different Grouting Materials
Abstract: The annular gap between the ground and the tunnel lining must be filled with a suitable grouting material, depending on the given (hydro-)geological boundary conditions. In case of permeable soils one-component grouts are used, which consolidate due to dewatering into the surrounding soil. In insufficiently permeable soils two-component grouts are used, which harden through a chemical reaction...
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