Significantly quieter and with lower maintenance overheads
During 2017, the 9 metric ton roller with power hybrid train was put through its paces on numerous construction sites all across Europe. It proved its worth in every respect. Handling and maintenance are simplified for example, because the smaller engine does not require an SCR catalytic converter and, therefore, requires no AdBlue. In addition, the roller is markedly quieter than its bigger-engined sibling. This aspect was well-received everywhere – including when compacting the binder and surface courses on the A 93 freeway in Bavaria. A STRABAG team there reported no differences in compaction performance and quality compared to conventionally powered 9 metric ton rollers – but everyone praised the lower noise emission thanks to the modified engine output.
The power hybrid roller was put to work with the Swedish construction company NCC over a number of months in 2017, racking up well over 500 operating hours in the process. Analyses revealed two important findings: Firstly, the PH roller invariably delivered the same compaction performance as its sibling model without hybrid technology. At the same time, NCC reported fuel savings of about 15%. This aspect was essential for the environmentally-conscious Swedes because the reduction in diesel consumption leads to markedly lower CO2 emissions.
Proven on city and country roads
Trials in France also yielded gratifyingly positive results: The French construction company Eiffage put the HD+ 90i PH to work for a number of weeks on widely differing sites in the south-west of France. The spectrum ranged from urban projects to the renovation of rural roads involving the compaction of widely differing asphalt types. Two experienced roller drivers put the new machine through its paces. They both agreed that the reduced interior noise level made it an extremely pleasant driving experience. Otherwise they could detect no difference than the 85 kW roller in respect of driving and compaction. And when it comes to performance, the people at Eiffage are convinced by the hybrid concept: All sites were monitored by a team from the laboratory. The evaluations showed that the degree of compaction on all projects was as good as the degree of compaction for the conventional HD+ 90i.