High standards with old methods on the A9

The A9 – a motorway, which connects the two cities with more than a million people, Berlin and Munich, and which has six lanes virtually along its complete stretch. When such an important transport axis shows signs of damage, action must be taken quickly. The 17-year-old road surface was already showing signs of cracks and fissures when the Rädlinger Selbitz branch got to work on the road rehabilitation. In the main phase, which only took from mid-June to mid-July 2015, approx. 28,000t of asphalt were milled off between the Münchberg-Nord junction and the Bayerisches Vogtland motorway junction and replaced by new asphalt binders, stone mastic asphalt and 79,000m² of mastic asphalt.

Amongst other things, the peculiar thing about this procedure was the mastic asphalt surfacing. This surface could be found on many stretches at an earlier point in time, but since the 1980s, it has been replaced by cheaper alternatives. It comprises a mixture of small and large aggregates as well as bitumen and may be both poured and brushed during installation, which means that compression work is not necessary. By using mastic asphalt, you can expect a durability of 30 years, because this material is considerably more steadfast and aging resistant than the more cost-effective stone mastic asphalt, which is used on the majority of streets nowadays. The mix is supplied by a factory in Gera, more than 100km away, which in itself requires logistic masterstrokes. Not only the asphalt, but also the central crash barriers were renovated. For this purpose, 12,000m of guardrails were removed, before approx. 10,000m³ of soil in the area of the central crash barrier and the hard shoulder could be replaced by a stable gravel base layer. Thanks to its improved stability and the additionally mounted protective structures, the central crash barriers have once more been adapted to comply with the latest safety standards.

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