When a 6.5-km stretch of highway in Denmark required to be restored, the job required recycling of product from the existing asphalt pavement. Wirtgen big milling makers and a mobile cold recycling plant showed effective by minimizing the job time along with carbon emissions.
Cold recycling of roadway surface area product is the most sustainable building and construction technique readily available for structural rehab. The cold mix that is produced with foamed bitumen and that makes up the brand-new base layer is perfect for roadways of any traffic level. For the task along Denmark’s E45 highway near the popular Legoland, the KMA 240i mobile cold recycling plant coupled with W 210i and W 250i big milling makers to work efficiently on a tight due date.
“We produced as much as 300 lots of cold mix per hour with the KMA 240i,” reports Morten Wold, Divisional Manager at SR-Gruppen A/S, which was handling the job.
Mobile cold blending plants keeps product near to the task website, minimizing transport logistics and expenses.
Wirtgen
The E 45 was crushed at a width of in between 3.15 and 5.9 metres and a depth of 28 cm. Crushed product was transferred to the KMA 240i milling plant close by. The mobile cold blending plant makes it possible for the specialist to remain near the asphalt elimination and paving area, lessening product transportation and considerably lowering the general CO2 emissions of the task.
A viability test was performed on the recovered asphalt pavement (RAP) before the start of the building stage. The perfect mix formula consisted of 2.2 foamed bitumen, 6 percent lime, and 0.8 percent cement.
The mix was then filled into an effect crusher and lowered to a kernel size of 0-32 mm, packed by wheel loader into the KMA 240i’s big capability getting hopper and fed into the twin-shaft constant mixer. 2 feed augers with a double-trough system and accuracy weighing looked after the different addition of lime and cement binding representatives.
Wirtgen broadened the abilities of the KMA 240i on the area by setting up an extra feed auger. The constant weighing system guaranteed that the ingredients were specifically dosed. The foamed bitumen was included utilizing the incorporated, microprocess-steered dosing system.
Hamm rollers and Vogele pavers utilized the mix produced by the cold recycling plant to position a brand-new asphalt mat on the highway.
Wirtgen
The supported bituminous cold mix was packed straight into big 36.5-ton trucks and carried instantly to the task website. Graders and Hamm rollers ready and compressed the frost defense layer below the crushed off asphalt pavement as a steady road for the pavers and trucks following on behind.
A MT 3000-2i mobile feeder from Vogele made sure smooth and smooth product circulation on the building website. The system makes it possible to stock big quantities of cold mix. Transportation logistics were challenging as no total roadway closures were permitted throughout the job. The MT 3000-2i offered versatility to fix up 2 lanes of highway without total roadway closure.
A Vogele SUPER 1900-3i paver set the product real to grade and slope, producing a 20-cm base layer of cold mix as the brand-new highway structure. A Hamm HD 120i tandem roller with an operating weight of more than 12 tonnes supplied the essential compaction, while a Hamm GRW 280i pneumatic-tire roller dealt with the last surface area treatment.
In 2 days, a binder course and surface area layer with a density of 8 cm was laid. An asphalt customized with polymers that fits the requirements of the high-traffic trucking lane and matches the base layer was picked.