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The problem of stripping can be effectively minimized using "DERBO" and "WETBOND" range of anti-stripping agents. Since they are made from Polymeric amines, the amine group of "DERBO" and "WETBOND" anti-stripping agents reacts with acidic aggregates and makes the aggregate surface hydrophobic (repulsive to water). Further lipophilic (oil loving) Fatty chain remains well suspended in bitumen to form a bridge between bitumen and aggregates. This prevents stripping even in presence of water.
Amine based "DERBO" and "WETBOND" Anti-stripping agents also act by changing the interfacial tension between Bitumen and aggregates and strengthening the bonding for long term durability.
In construction of bituminous pavements, the aggregates are used in two ways e.g. in coated form (Hot Mix etc.) and uncoated form (spraying work etc.). When used in proper dose, "DERBO" and "WETBOND" are equally effective in both the applications. In coated form they prevents stripping even when coated aggregates are submerged in water and in uncoated form they provides active adhesion of bitumen even with wet aggregates.
Dose of DERBO and WETBOND :
The Optimum doses of commercial grades are
|GRADE||For Hot-mix (% w/w of Bitumen)||For Repairs (% w/w of Bitumen)|
|DERBO-401 Premium Liquid||0.2 to 0.4%||0.3 to 0.5%|
|DERBO-101-P5 Flakes *||0.1 to 0.2%||0.2 to 0.3%|
|WETBOND-SP Performance Liquid||0.3 to 0.5%||0.4 to 0.7%|
|WETBOND-E Economy Liquid||0.5 to 0.7%||0.6 to 1.0%|