Engineering structures to high aesthetic standards
NOEplast Murus Romanus texture gives retaining wall an attractive appearance
As a rule, an engineering structure is built and its design optimised for a specific purpose. Aesthetic aspects usually take second place. Not so with the 90 m long retaining wall on the section of the B10 trunk road between Pirmasens and Haseneck, Germany. On this structure, textured formliners from NOE-Schaltechnik were used to create exposed concrete surfaces to a high aesthetic standard.
For the motif of the wall, the designer chose the "Murus Romanus" texture. It gives the viewer the impression of an elaborately bedded natural stone and belongs to the standard range of the manufacturer NOE-Schaltechnik. The company markets formliners under the name NOEplast in a wide range of predesigned motifs, with the option of realising one-off ideas as customised motifs. A combination of smooth and textured concrete surfaces was chosen to achieve the desired visual effect on the B10 retaining wall. The textured formliners create the illusion of a masonry arch, the face of the archway below the arch is a normal smooth panel-formed concrete surface.
NOE-Schaltechnik formliners are manufactured out of polyurethane and if handled properly can be reused up to 100 times, which considerably reduces total construction costs. Vilshofen-based contractor Joseph Rädlinger took advantage of this and used the formliners nine times. Although the motif was reproduced on the wall consistently well, multiple use of the formliners set Rädlinger's team a demanding task. Because the manufacturer usually recommends that the textured formliners are glued to the panel system or cladding for site use (only in precast plants can the formliners be placed against the vibrating table). But here this was impossible, as the retaining wall had sections of different heights. This meant that the panels as well as the formliners had to be modified to suit each situation. To ensure the polyurethane formliners adhered adequately, the contractor split them into left and right arch halves and glued them on to thin supporting cladding. This combination could then be shortened to the desired dimensions with a circular saw or jigsaw and screwed to the panel system.
From one source
NOE-Schaltechnik is the only manufacturer on the market who offers textured formliners and panel systems from a single source. If required, this service extends to planning the formwork use and construction cycle for the contractor. Furthermore, NOE can attach the textured formliners to the panel system and deliver them to site ready for use.
Alternate bay working
The contractor fixed a total of 45 t of reinforcement and placed 1500 m³ of
concrete in the construction of the retaining wall. As almost any type of
concrete can be used with NOEplast textured formliners, the concrete mix could
be designed around the requirements of the retaining wall. But the tensile
stresses produced in the concrete section itself proved a challenge to the
structural engineers. To prevent shrinkage cracks, the wall was divided into
nine sections and cast in alternate bays. This process involves casting lengths
of the wall in a hit-one miss-one bay pattern, then going back at various stages
to fill in the open bays. For this project, the sections were cast in the
The project team proved with the 90 m long retaining wall on the B10 between Pirmasens and Haseneck that even simple engineering structures like a retaining wall can be designed to be aesthetically pleasing and cost-effective to construct. The multiple use of the formliners makes this possible. NOE-Schaltechnik is a project partner with decades of experience in this field. Jeanette N. Schmid, the engineer who designed the structure, says: "We could depend on the rapid and ready cooperation of NOE-Schaltechnik and are very satisfied with the reliability of the company." There could be no higher praise.
Josef Rädlinger Ingenieurbau GmbH
94474 Vilshofen, Germany