#Placing pug mix base stone upgrade#

Hydrated lime is the most effective anti-stripping agent available and is widely specified by states with serious stripping problems. Climatic characteristics such as heat, heavy rains, freeze/thaw cycles, and traffic play a major role in stripping. Certain types of aggregates are particularly susceptible to stripping. Stripping occurs when the bond between the asphalt cement and the aggregate breaks down due to the presence of moisture, and the binder separates from the aggregate. Hydrated lime substantially improves each of these properties when used alone, and also works well in conjunction with polymer additives, helping to create pavement systems that will perform to the highest expectations for many years.

These modifications can reduce stripping, rutting, cracking, and aging. Hydrated Lime A Multi-Functional Asphalt ModifierĪs numerous state highway authorities have found, modifications made to HMA with hydrated lime will add years to the pavement’s life. In addition to the chemical effects that lime imparts to reduce stripping potential and the aging impact resulting from oxidative hardening, the “filler effect” of lime improves resistance to high-temperature rutting and adds fracture toughness at low temperatures.

#Placing pug mix base stone upgrade#

Lime is also useful to upgrade marginal aggregates.

Lime alters clay fines to improve moisture stability and durability.

Lime changes oxidation chemistry in the binder to reduce age hardening and.

It improves toughness and resistance to fracture growth at low temperatures.

It stiffens the binder and HMA to resist rutting.

While hydrated lime has long been an acknowledged anti-strip additive for asphalt pavements, recent studies confirm that lime imparts other important benefits: Lime has been used in hot mix asphalt (HMA) to reduce moisture sensitivity and stripping since 1910 in the United States.