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    Wyświetlanie 1-4 z 4
    Tytuł:
    Effects of zeolites and hydrated lime on volumetrics and moisture resistance of foamed warm mix asphalt concrete
    Autorzy:
    Chomicz-Kowalska, Anna
    Maciejewski, Krzysztof
    Iwański, Mateusz Marek
    Janus, Karolina
    Powiązania:
    https://bibliotekanauki.pl/articles/2173599.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WMA
    foamed bitumen
    zeolite
    hydrated lime
    bitum spieniony
    zeolit
    wapno hydratyzowane
    Opis:
    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.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; art. no. e136731
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of zeolites and hydrated lime on volumetrics and moisture resistance of foamed warm mix asphalt concrete
    Autorzy:
    Chomicz-Kowalska, Anna
    Maciejewski, Krzysztof
    Iwański, Mateusz Marek
    Janus, Karolina
    Powiązania:
    https://bibliotekanauki.pl/articles/2090731.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WMA
    foamed bitumen
    zeolite
    hydrated lime
    bitum spieniony
    zeolit
    wapno hydratyzowane
    Opis:
    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.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136731, 1--9
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue life comparison of recycled cold mixes with different type of bitumen binder
    Porównanie trwałości zmęczeniowej recyklowanej mieszanki na zimno z różnym rodzajem lepiszcza asfaltowego
    Autorzy:
    Buczyński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/402197.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
    Tematy:
    recycled cold mix
    fatigue life
    bitumen emulsion
    foamed bitumen
    cement
    hydrated lime
    recyklowana mieszanka na zimno
    trwałość zmęczeniowa
    emulsja bitumiczna
    asfalt spieniony
    wapno hydratyzowane
    Opis:
    Knowledge of the fatigue life is required to properly predict pavement structure reliability with respect to the number of loading cycles. The possibility of using foamed bitumen and bitumen emulsion as binders in the composition of road bases makes it necessary to identify the influence of the binder type on the service life of these layers through dynamic tests. Obtaining proper physical and mechanical parameters does not necessarily ensure the correct evaluation of the recycled base quality. Satisfaction of the quality-related requirements does not guarantee the provision of the required fatigue life parameters. Cold recycled bases with cement should work within the viscoelastic range due to hydraulic bonding in the structure. If this range is exceeded, a considerable rise in strains occurs as a result of brittle fracture, leading to the loss of fatigue life. The paper presents the results from the fatigue tests of recycled bases. The amount of bitumen used in both cases was 3% and 5%. For the production of the bitumen emulsion and foamed bitumen, 70/100 pen bitumen was used. Portland cement I 32,5R was applied as a binder. The binder comprised 3% of the mineral composition of the recycled base layer. Fatigue tests were performed in compliance with the requirements of enclosure E of PN-EN 12697-24 at a constant normal stress of 250 kPa, 375 kPa and 500 kPa. The results were used to compare the effects of the binder type applied to the recycled base and determine the service life in terms of the stress applied.
    Źródło:
    Structure and Environment; 2016, 8, 4; 217-223
    2081-1500
    Pojawia się w:
    Structure and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wodoodporność recyklowanej podbudowy z asfaltem spienionym w aspekcie składu spoiwa drogowego
    The water resistance of a recycled base with foamed bitumen in the aspect of road binder composition
    Autorzy:
    Buczyński, P.
    Iwański, M.
    Mazurek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/391058.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    spoiwa drogowe
    recykling głęboki
    asfalt spieniony
    wapno hydratyzowane
    cement portlandzki
    pyły cementowe
    podbudowa recyklowana
    hydraulic road binder
    cold deep recycling
    foamed bitumen
    hydrated lime
    Portland cement
    cement dust
    recycled base
    Opis:
    W referacie przedstawiono rezultaty badań recyklowanej podbudowy wykonanej w technologii recyklingu głębokiego na zimno z asfaltem spienionym oraz spoiwem mieszanym. W badaniach szczególną uwagę zwrócono na jej wodoodporność. Indywidualne projektowanie składu spoiwa pozwala na precyzyjne dostosowanie jego oddziaływania do warunków terenowych oraz wymaganych parametrów recyklowanej podbudowy. Projekt recyklowanej podbudowy z asfaltem spienionym symulował proces recyklingu głębokiego na zimno. Zastosowane składniki mineralne tj. destrukt asfaltowy, kruszywo 0/31,5 mm oraz kruszywo doziarniające 0/4 stanowiły materiał odpadowy z istniejącej konstrukcji. W składzie recyklowanej podbudowy zastosowano spoiwa drogowe, które wytworzono w warunkach laboratoryjnych z wymieszania trzech bazowych składników. Udział procentowy poszczególnych spoiw drogowych określono zgodnych z planem eksperymentu sympleksowo-centroidowego. Na podstawie uzyskanych wyników badań stwierdzono różnorodny wpływ analizowanych składników spoiw drogowych na właściwości mechaniczne oraz wodoodporność recyklowanej podbudowy. W oparciu o zastosowany plan eksperymentu możliwe było określenie składu spoiwa drogowego, które zapewni uzyskanie recyklowanej podbudowy odpornej na działanie wody.
    The paper describes research results of recycled base which was performed in a cold deep recycling technology with foamed bitumen and different type of hydraulic mixed binder in the aspect of water resistance. An individual design of a composition of a binder enables to achieve a precise adjustment of a binder’s impact to local conditions and required parameters of a recycled base. The design a recycled base with foamed bitumen simulated a cold deep recycling process with materials from existing crushed bituminous pavement layers ("technology in-situ"). To produce the foamed bitumen a road bitumen of penetration grade 50/70 was used. Moreover, the following mineral components were categorised as a waste material: reclaimed asphalt pavement, 0/31,5 mm aggregate and aggregates for soil gradation improvement 0/4. A composition of the recycled base consisted of the binders prepared in the laboratory as a result of a mix of three basic components. The percentage of individual road binders was determined in line with the plan of the simlex-centroid experiment. For the purpose of determining an influence of such a hydraulic road binder on the water resistance in recycled base, the following tests were carried out: void contents Vm, tensile strength ratio TSR (water resistance). Additionally, an evaluation of increase of indirect tensile modulus (IT-CY) was conducted. On the basis of the test results, a varied impacts of tested hydraulic road binders on mechanical properties and water resistence of recycled base with foamed bitumen were observed. On the basis of the plan of the experiment, it was possible to determine the recommended road binder composition that enabled to obtain the water resistance in the recycled base with foamed bitumen.
    Źródło:
    Budownictwo i Architektura; 2016, 15, 1; 19-29
    1899-0665
    Pojawia się w:
    Budownictwo i Architektura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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