Lime In Asphalt - Anfacal

Lime In AsphaltLime in AsphaltNot Just a FillerNot Just a FillerHydrated Lime is an Active Ingredient inAsphalt Mixes and providesAdded ValueHydrated Lime is an Active Ingredient inAsphalt Mixes and provides Added Value

Benefits of Lime in AsphaltHydrated Lime (HL) provides a host of benefits• Reduced Rutting• Slower Aging Rate• Reduced Cracking due to Fatigue• Excellent Anti-Stripping Agent

Rutting Prevention in HMAImproved Bitumen StiffnessThe addition of 1.0% to 1.5% Hydrated Lime (HL) to Asphaltmixes results in a marked improvement in rutting resistance.This graph shows the change in G*/Sin delta across five SHRP bitumens by modifyingthem with 20% hydrated lime (equivalent to 1 – 1.5% HL in the HMA)

Rutting Prevention in HMAResults of Rut TestingRut test results on four different aggregates further demonstratethe effect of adding Hydrated Lime (HL) to the asphalt mixGeorgia Rut Tester (40C) to 7.5mm depth

Reduce Oxidation and Aging RateImpact of HL on OxidativeHardening of BitumenPhysiochemical interactionsbetween Hydrated Limeand bitumen reduce thesusceptibility of thebitumen to oxidativedeteriorationReduced Cracking of theAsphalt surface is obtainedas the bitumen remainsmore ductile

Less Cracking due to FatigueHL effect on Bitumen chemistry improves cyclictensile loading performanceResults of cyclic tensilefatigue testing of HMAsamples. A significantimprovement inperformance is evident inthe HL treated mixtures.Results of fatigue testing on dense-graded mixtures of crushedlimestone aggregate and two SHRPbitumens. Samples aged beforetesting. 20% HL equivalent to 1%in a typical HMA mix

Hydrated Lime is the bestAnti-Stripping AgentSubstantially Decreases Moisture DamageAggregate properties tendto dominate when it comesmoisture susceptibility,which is a prime culprit instripping of HMA.Relative Effectiveness of Additives in ReducingMoisture Damage SusceptibilityLime interaction at theaggregate surface enhancesthe bitumen-aggregate bond.Hydrated Lime outperformsall other types of anti-stripagents in ASTM tests.

Financial Benefit of Lime inAsphalt Mixes from Longer LifeInclude 1-1.5%Hydrated Lime inAsphalt mix designGain the followingoperational benefits:• Reduced Rutting• Slower Aging due to Oxidation• Reduced Cracking due to Fatigue• Excellent Anti-Stripping AgentLower yourLife-Cycle CostSave $$$ inMaintenance, Repair,and Replacement Costs

Lime is for EveryoneThe DesignerProven Technology – Excellent performance recordBest use of in-place materials – Ecologically preferredVery cost efficient – More roads for the same budget!The BuilderProven Technology – Excellent performance recordEasy to use and readily availableHelps keep the job moving – removes water and clay problemsVery cost efficient – More roads for the same budget!