Investigation of tertiary Flow Behavior of bitumen stabilised materials with bitumen emulsion

• Autorzy: Konieczna Katarzyna , Król Jan

Identyfikatory

DOI

10.7409/RABDIM.023.030

Warianty tytułu

PL

Wykorzystanie metody Flow Number do oceny odporności na deformacje trwałe mieszanek stabilizowanych emulsją asfaltową

• Języki publikacji: EN PL

Abstrakty

EN

Cold recycling technology is gaining popularity as a sustainable way of rehabilitating existing asphalt pavements. Bitumen Stabilised Materials with bitumen emulsion (BSMs) are cold recycling mixtures (CRMs) that contain RAP, virgin aggregates, bitumen emulsion, water, and active filler and exhibit a combination of mechanical properties of both granular and viscoelastic materials. However, the BSMs’ mechanical performance in terms of viscoelasticity remains insufficiently explored. This study aimed to synthesize and adapt dynamic creep test methods, commonly used for HMA mixes, for characterizing tertiary flow behavior of BSMs. Tests were conducted on BSM mixtures with 50% and 70% RAP content, bitumen emulsion amount in the 4.5%–6.4% range, and 1% cement addition. The designed BSM series were also differentiated in terms of volumetric properties. Permanent deformation (PD) response of Bitumen Stabilised Materials was evaluated based on the analysis of the accumulated permanent strain curves obtained in repeated load tests. The experimental data were fitted to the Francken model, using an originally developed Python calculation script, to determine the Flow Number (FN) values for BSMs under specified loading stress and testing temperature conditions. The study showed that the specification of the Flow Number dynamic creep test parameters for testing BSMs requires an individual approach depending on the composition and volumetric properties of the mixture. With appropriately selected test conditions, the permanent deformation of BSMs can be evaluated by means of fitting the accumulated permanent strain curve to the Francken model and estimating Flow Number values.

PL

Recykling głęboki nawierzchni drogowych w technologii na zimno zyskuje coraz większą popularność, wpisując się w trendy zrównoważonego rozwoju w budownictwie. Mieszanki stabilizowane emulsją asfaltową (Bitumen Stabilised Materials — BSM), stosowane do wykonywania podbudów drogowych, zawierają destrukt asfaltowy, kruszywo doziarniające, wodę oraz środki wiążące: emulsję asfaltową lub asfalt spieniony oraz cement. W zakresie właściwości mechanicznych, mieszanki BSM wykazują właściwości charakteryzujące zarówno materiały ziarniste, jak i lepkosprężyste. Analiza źródeł literaturowych wskazuje, że aspekt lepkosprężystości mieszanek BSM nie został dotychczas wystarczająco zbadany. W artykule przedstawiono wyniki prac nad syntezą i adaptacją procedur badania pełzania dynamicznego, stosowanych do oceny odporności na deformacje trwałe mieszanek mineralno-asfaltowych, w celu przeprowadzenia oceny właściwości mieszanek BSM. Badania metodą Flow Number przeprowadzono na mieszankach BSM z 50% i 70% zawartością destruktu asfaltowego, ilością emulsji asfaltowej w zakresie 4,5%–6,4% oraz dodatkiem cementu na poziomie 1%. W celu wyznaczenia wartości parametru Flow Number analizowano przebieg krzywych skumulowanego odkształcenia trwałego przy zadanych warunkach obciążenia i temperatury. Dokonano oceny dopasowana modelu matematycznego Franckena do danych empirycznych. Przeprowadzone badania i analiza danych wykazały, że ustalenie parametrów badania dynamicznego pełzania Flow Number na potrzeby badań mieszanek BSM wymaga indywidualnego podejścia uwzględniającego skład i właściwości objętościowe tych mieszanek. Przy właściwie dobranych warunkach obciążenia i temperatury, możliwe jest przeprowadzenie oceny odporności na deformacje trwałe mieszanek BSM, stosując metody badawcze aplikowane do lepkosprężystych mieszanek mineralno-asfaltowych.

Słowa kluczowe

EN

bitumen stabilised materials; flow number; tertiary flow; permanent deformation; cold recycling mixtures

PL

bitumen stabilised materials; BSM; Flow Number; deformacje trwałe; technologia recyklingu na zimno

• Wydawca: Instytut Badawczy Dróg i Mostów
• Czasopismo: Roads and Bridges - Drogi i Mosty
• Rocznik: 2023
• Tom: Vol. 22, no. 4
• Strony: 491--502
• Opis fizyczny: Bibliogr. 34 poz., rys., tab.

Twórcy

autor

Konieczna Katarzyna

• Warsaw University of Technology, 16 Armii Ludowej St., 00-637 Warsaw

• https://orcid.org/0000-0002-2663-2984

autor

Król Jan

• Warsaw University of Technology, 16 Armii Ludowej St., 00-637 Warsaw

• https://orcid.org/0000-0001-8728-3530

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Uwagi

An extended version of the article from the conference “Modern Road Pavements – MRP’2023” – Recycling in road pavement structures co-edited by Martins Zaumanis and Marcin Gajewski, published in frame of the Ministry of Education and Science project No. RCN/SP/0569/2021/1.