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Influence of the type of recycled asphalt pavement on the properties of the SMA JENA 16 stone mastic asphalt mixture

Ramiączek Piotr, Cielibała Mikołaj, Skrzyniarz Natalia, Janus Karolina, Maciejewski Krzysztof, Iwański Mateusz M., Chomicz-Kowalska Anna

Roads and Bridges - Drogi i Mosty

2023

Vol. 22, no. 4

569--578

One-layer asphalt pavements with stone mastic asphalt (SMA JENA) have been used in Poland since 2010. Despite numerous advantages, including facilitating significant progress in work and lower costs compared to traditional asphalt mixtures, this technology is not widely applied in Poland. This paper evaluated the properties of a one-layer JENA 16 stone mastic asphalt mixture with the addition of recycled asphalt pavement. Two asphalt granulates obtained from milling the wearing and binding layers and the binding subbase were used in the research. Both granulates significantly differed in the applied mineral material and the type of asphalt binder contained in them. The research plan involved dosing the granulate in quantities ranging from 10% to 50% relative to the mineral mixture, ensuring that the resulting grain size distribution closely matched the profile of the analyzed reference mixture. Basic physical and mechanical parameters of the JENA 16 asphalt mixture and both granulates were evaluated. The studies showed a varied impact of the type and quantity of recycled asphalt pavement on the properties of SMA JENA 16. The asphalt granulate did not significantly affect the water resistance of the tested samples. However, a positive effect on the resistance of the asphalt mixture to permanent deformations was observed.

Jednowarstwowe nawierzchnie asfaltowe z mastyksem grysowym (SMA JENA) stosowane są w Polsce od 2010 roku. Pomimo licznych zalet, m.in. umożliwiających znaczny postęp robót oraz niższe koszty wykonania w stosunku do tradycyjnych mieszanek mineralno-asfaltowych, technologia ta nie jest szeroko stosowana w Polsce. W pracy dokonano oceny właściwości mieszanki jednowarstwowego mastyksu grysowego JENA 16 z dodatkiem granulatu asfaltowego. W badaniach wykorzystano dwa granulaty asfaltowe uzyskane z frezowania nawierzchni warstwy ścieralnej i wiążącej oraz wiążącej podbudowy. Oba granulaty w znaczy sposób różniły się zastosowanym materiałem mineralnym oraz rodzajem zawartego w nich lepiszcza asfaltowego. Plan badań zakładał dozowanie granulatu w ilości od 10% do 50% względem mieszanki mineralnej, tak aby uzyskana w ten sposób krzywa uziarnienia była jak najbardziej zbliżona do przebiegu analizowanej również mieszanki referencyjnej. Ocenie podlegały podstawowe parametry fizyczne, jak i mechaniczne mieszanki mineralno-asfaltowej JENA 16 oraz obu granulatów. Badania wykazały zróżnicowany wpływ rodzaju, jak również ilości destruktu asfaltowego na właściwości mieszanki SMA JENA 16. Granulat asfaltowy nie wpłynął znacząco na odporność na działanie wody badanych próbek, zanotowano natomiast pozytywny wpływ granulatu na odporność mieszanki mineralno-asfaltowej na deformacje trwałe.

Effects of zeolites and hydrated lime on volumetrics and moisture resistance of foamed warm mix asphalt concrete

Chomicz-Kowalska Anna, Maciejewski Krzysztof, Iwański Mateusz Marek, Janus Karolina

Bulletin of the Polish Academy of Sciences. Technical Sciences

2021

Vol. 69, nr 2

art. no. e136731

The paper concerns the utilization of hydrated lime and zeolites as additives in warm mix asphalt produced with foamed bitumen. The mentioned additives were added to the mixtures in exchange for specific quantities of mineral filler, which amounted to 0.4% and 1.2% of hydrated lime or 0.4% of water-modified and 1.0% of air-dry zeolites in mineral mix. The study investigated warm-produced mixtures with 4.5% and 4.8% binder content and production and compaction temperatures set at 120⁰C and 100⁰C respectively. Additionally, reference hot and warm mixtures were evaluated. The testing included: air void content, indirect tensile strength in dry state and after one freeze-thaw cycle as well as the resulting resistance to moisture and frost damage index. The mixtures incorporating hydrated lime and lower bitumen content of 4.5% exhibited increased air voids and mostly unchanged mechanical performance when compared to the reference warm mix. Increased bitumen content has resulted in significantly improved performance in moisture resistance and compactability which could be compared to that of the reference hot-produced mixture. On the other hand, the incorporation of zeolites in the foamed bitumen mixtures resulted in all cases in increased air void content in the samples. This has apparently led to decreased indirect tensile strength, in both the dry state and after the freeze-thaw cycle. Based on the results it was concluded that the production temperature of the zeolite-bearing mixtures was too low for the zeolite water to significantly improve the mix’ workability and therefore positively affect its mechanical parameters.