Maximising reliability and structure longevity
Bridge structures of concrete and masonry require tailor-made repair and surface protection systems, capable of combating the kinds of deterioration that inevitably arise due to their exposed location and protracted in-service periods.
Nafufill KM 230 and Nafufill KM 250 are concrete replacement systems capable of meeting any specification. Their technical performance exceeds every established standard, offering you maximum quality assurance. For large-area rehabilitation work that – for reasons of cost-effectiveness – allows the application of the dry spray process, Nafufill GTS is the optimal solution.
Surface protection systems are essential for ensuring that concrete – whether new or repaired – remains intact and presentable over the long term. The range of destructive phenomena that can occur includes not just weathering, environmental attack and the dynamic loading caused by moving traffic, but also more and more deliberate acts of disfigurement, with graffiti a particular scourge. However, the MC-Color modular surface protection product range allows you to put truly effective safeguards in place with its three product lines, MC-Color Proof, MC-Color Flair and MC-Color Flex. You can be sure of a solution for every application profile: transparency, pigmented, crack-bridging and graffiti repelling.
MC-Color also offers system solutions for the direct curing of concrete replacement compounds to ensure fast and cost-efficient job execution.
For sealing, structural strengthening and crack, void and cavity sealing applications
It is no rarity for cracks in reinforced concrete bridges to propagate down deep to the rebar, even causing separation of the entire component. Over time, cavities and voids may also develop. Harmful substances such as water or chlorides are then able to penetrate unhindered down to the core of the structure, causing significant damage that ultimately jeopardises the stability of the entire bridge assembly.
With our MC-Injekt systems, you can seal cracks, joints, cavities and voids in bridge components reliably and durably, rehabilitating the structure in terms of both its functional efficiency and service lifetime.
Extending bridge service lifetimes
Many aging bridges lose some of their load-bearing strength due to deterioration, corrosion or damage to their original reinforcing steel. Now, restoring them to structural soundness can be remarkably inexpensive thanks to MC-DUR CFK carbon-fibre reinforced strips or sheets.
Even flexural reinforcement is easily handled, with strips bonded either in slots or on the surface. In contrast to conventional rehabilitation systems, these solutions have virtually no effect on passage clearance. Railway or road traffic headroom under bridges remains unimpaired, which means no diversions are necessary. And if required, you can also render your MC-DUR CFK strips invisible by applying a coat of Nafufill LM fine filler and the surface protection coating MC-Color Flair, for additional protection and a visual upgrade.
Effectively maintaining and protecting natural stone and brick-built bridges
As masonry is often constructed from large-scale bricks or blocks without movement joints, any deformations arising from dynamic loading or thermal effects have to be absorbed by the masonry itself. This means the jointing material is particularly important: It has to be sufficiently yielding while exhibiting sufficient strength to ensure a permanent bond between the bricks or blocks. The mineralogical composition of masonry mortars and injection adhesives is also important when it comes to withstanding masonry-specific chemical attack.
Oxal joint mortars and injection adhesives offer long-proven solutions to the specific requirements of masonry.
Ensuring durable protection
As large horizontal surfaces on bridges, carriageway decking slabs are prone to attack by environmental phenomena such as water and de-icing salt. It is therefore essential that these slabs are properly sealed. The purely bitumen-based systems of the past do not meet today’s requirements. Satisfactory results are only achieved through the application of an initial waterproofing layer of epoxy resin covered by a bituminous wearing course. Our special bridge resin MC-DUR LF 480 offers optimum adhesion to both concrete and bitumen and can be applied as a primer, waterproofing barrier and a scratch and levelling filler. It has also been tested compatible for applications such as a PC mortar, offering optimum application properties and facilitating fast construction progress.
Ideally adapted to road surfaces for traffic noise reduction
Conventional pavement transition systems such as steel-based expansion joints are expensive and complex constructions. They are difficult to install and the passing traffic generates a permanent noise nuisance, with disruption day and night particularly noticeable in inner city areas. Pavement expansion joints of asphalt such as Nafutekt Plus offer a quiet, fast and inexpensive alternative. The combination of the special bituminous impregnation compound, Nafutekt Plus, and a system-tested high-grade aggregate, provides a durable transition capable of accommodating movements between the bridge and the open road. The system also readily adapts to the adjoining carriageway paving to avoid this source of noise.