Warm-mix is a form of Hot-mix Asphalt produced and laid at lower than recommended HMA temperatures to decrease fuel consumption, reduce green house gases and to achieve same degree of mix compaction even at lower temperatures. The additives used for this purpose are called Warm-mix additive and they include a range of chemical and wax based products.
During initial evolution of warm-mix concept, most of the additives contained water to achieve “foaming” of bitumen resulting in warm mix properties. These additive carried a number of problems like uncertain results, induced stripping, tedious process, increased oxidation and premature failure of pavement, human health hazard etc.
With advancement of technology, fat, chemical and wax based meltable solid type additives were introduced by many reputed organizations with varied levels and advantages in terms of dose, emission, field performance, stripping and oxidation control etc.
In latest of Warm-mix technology, very high performance liquid additives were introduced with advantages of low dose, easy mixing, safe handling, maintain temperature during haulage, outstanding control of stripping, minimized oxidation, cost effective etc. “WETBOND-WMA” liquid is the shining star of this category of low dose, high performance additives with unique feature of being non-hazardous.
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