Pobierz pełny numer 1/2010 S&E - Structure and Environment - Kielce

THE IMPACT OF AGING ON WATER AND FROST RESISTANCE OF ASPHALT CONCRETE WITH LOW – TEMPERATURE BITUMENsuch as: stability, static creep and indirect tensilestrength, and less considerable changes afteraging.4. The use of the low – viscosity bitumen sloweddown and reduced the consequences of aging ofasphalt concrete.5. This has a significant impact on maintaining itsphysical and mechanical properties at the requiredlevel during the operation period.6. Low – viscosity bitumen maintains the water andfrost resistance and resistance to low temperaturecracking of asphalt concrete.7. The use of Olexobit 30 NW bitumen enables tolower the required compaction temperature ofasphalt concrete of about 15-20ºC.8. Its physical and mechanical properites are at therequired level; the resistance to weathering is alsoensured.Fig. 5. Indirect tensile strength after long – term agingat 2 o C and the ratios of indirect tensile strength of curedsamples of asphalt concrete after long – term agingAsphalt concrete with the low – viscosity asphaltremains elastic despite the destructive impact ofaging on water and frost resistance. It may be alsomuch more durable. In spite of aging it is stillresistant to the effects of temperatures below 0 o C.The values of the indirect tensile strength ratiosof asphalt concrete with low – viscosity asphalt anddiabase and quarzite aggregate are similar. It can beexplained by a significant void fraction content inasphalt concrete with diabase aggregate.Based on the tests of the impact of aging on waterand frost resistance of asphalt concrete with thelow – viscosity bitumen, it can be concluded thatthis kind of bitumen limits the effects of aging dueto the reduced stiffening of the mastix. Thus itssignificantly improving water and frost resistance ofasphalt concrete.References[1] Iwański M., Mazurek G. (2008): Wpływ temperaturyzagęszczania na właściwości betonu asfaltowego,Proceedongs of 54 th Scientific Conf., Krynica, 23-25September.[2] Judycki J., Jaskuła J. (1997): Water and frost resistanceof asphalt concrete, „Drogownictwo” 12, s. 374-378.[3] Judycki J., Jaskuła P. (1999): Badania oddziaływaniawody i mrozu na betony asfaltowe o zwiększonejodporności na deformacje trwałe, „Drogownictwo” 12,s. 367-371.[4] Danowski M. (ed.), (2007): Application of hot mixasphalt of low-term consolidation – german experiences„Nowości Zagranicznej Techniki Drogowej” 197,s. 12-35, Warszawa.[5] PANK 4302 Standard Asphalt pavements. Lowtemperature resistance. Method of determining indirecttensile strength.[6] Radziszewski P., Kalabińska M., Piłat J. (2003):Technologia materiałów i nawierzchni asfaltowych,Badanie odporności na niską temperaturę, s. 309-311.Warszawa.5. ConclusionsFrom the analysis of the test results the followingconclusions can be drawn:1. Low-viscosity bitumen is suitable for productionof asphalt concrete.2. Low – viscosity bitumen has higher softeningpoint and lower penetration than the traditionalbitumen.3. Asphalt concrete with the low – viscosity bitumenis characterised by better mechanical properties29