This unique technology involves crushing the existing road paving material and then combining it with an emulsion or foam of bitumen suspended in water together with a small amount of cement or lime. The bitumen acts as a flexible binding agent and band together the crushed particles. It also limits the access of water into the road base since the hydrophobic nature of bitumen inhibits water entering a layer of well-compacted material. The compaction, uniform thickness and smoothness of road will be making sure from special type of mechanical pavers. Water entering the road base is a major factor in causing roads to deteriorate, particularly in all parts of India that are subject to hot wet summers and freezing winters.
The results deriving from applied research efforts primarily in South Africa, the Netherlands, China, the United Kingdom, Australia and the United States of America suggest that the energy consumption associated with relaying a road can be reduced by a factor of up to three compared to older and more conventional technologies. In addition, the greater durability of roads lay with this technique further reduces the expense and energy consumption associated with road repairs. The technology is being applied in developed countries and is reporting cost savings and savings in carbon emissions in the order of 30 per cent. Over all benefits is reduced disruption to traffic due to faster turn around.
In India, main problem is drainage system along roadside. However, civil engineers are working on this problem by creating slope along roads. Water can be able to percolate through storm water drains. Problem doesn’t end here. What we need is timely de-silting of drains and best way to introduce rainwater harvesting system along roadsides will defeat all aims. In usual practice of normal bitumen roads, the life of road is average five years and later it needs fresh coat of bitumen, which increase height of road and decrease height of footpath. Due to change of climate in some parts of India, normal bitumen roads are failing frequently. The need of the hour is German Foam Technology, which have unique design methods and roads will prove more economical in the end as they last longer while it may be costlier.