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| 2. |
- Carswell, I., et al.
(författare)
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Main Report on Results of Comparative Site Monitoring
- 2012
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- The objective of WP 2 is to analyse the potential use of reclaimed asphalt (RA) in new asphalt surface layer mixes and particularly the use of modified binders. Therefore the chemical compatibility of new binders with old bitumen in RA and the physical performance of the resulting binder and asphalt mixes have been examined separately to develop mix-design guidelines to ensure a long service life of asphalt mixes with reclaimed asphalt.In new bituminous bound courses, especially in base asphalt layers, the use of up to 40 % of RA is state of the art in most of the European countries. In surface layers, RA is currently used in relatively small amounts (10 to 20 %) if at all, because the demands on the properties of surface courses are very high. Surface courses need good deformation resistance at high temperatures as well as a high resistance against top-down cracks at low temperature and good skid resistance. The aggregates and binder used in surface courses are therefore of premium quality.The objective of WP 2 is to analyse the potential use of reclaimed asphalt (RA) in new asphalt surface layer mixes including the use of penetration grade and polymer modified binders (PmB’s). In lower asphalt layers (e.g. bituminous base courses) the use of high quantities of RA is common in most European countries. In surface course layers this occurs less frequently due to the high demands on the surface course.Incorporation of RA into asphalt layers can reduce the demand for added binder to the new mixture, depending on the residual binder content and recovered binder properties of the RA. Using RA in new asphalt mixtures has the potential to reduce costs and reduce energy requirements through reduced demand for raw materials and reduced transport of raw materials. This report covers the performance RA sites monitored which include both plant mixed RA sites (with and without polymer modified binder); and in situ hot recycling sites. The performance of sites is compared with control sections where no RA has been used.
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| 3. |
- Kuttah, Dina K, 1975-
(författare)
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Advances in Design and Testing of Future Smart Roads : Considering Urbanization, Digitalization, Electrification and Climate Change
- 2022. - 1
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- The streets and roads constitute an enormous part of civil infrastructure and a large part of our cities- a social resource that must be properly managed and developed. Therefore, many road construction companies, contractors, transport and traffic administrations and municipalities are seeking for new road design models that can withstand modern challenges and demands. This book deals with adapting current road designs to better withstand these future challenges as well as optimizing their structural design. Furthermore, the book illustrates recommendations and models for street/road sections, including the road section with a reconfigurable design, which can be used in both reconstruction and new construction of roads.Features:Covers road testbeds that meet the challenge of future urbanization, including digitalization and electrificationProvides recommendations for potential climate change impacts, including flooding and ice accumulation problemsIntroduces the concept of reconfigurable and removable streets including recommendations for corresponding street testbeds
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| 7. |
- Kuttah, Dina K, 1975-
(författare)
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An overview on portable roads and airfields : using of matting systems as temporary and semi-permanent roads and airfields
- 2019
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Matting systems used as roadways and airfields are new innovative techniques used to solve mobility problems and make it easier to get around and transport goods under different climate and traffic conditions. The portable roads are extremely versatile and can be used for servicing areas with poor ground conditions, heavy load requirements and high traffic density. They could be used to facilitate vehicular access into areas that contain saturated soils, wetlands or soft/poor subgrade conditions and make secluded areas accessible (remote regions in general.).Moreover, portable roads can be used as temporary roads for emergency situations to enable aid deliveries to disaster areas, or during maintenance of existing roads or as temporary roads during a traffic jam.Regarding the portable airfields, some portable runways have been developed to support the heavy rolling loads, including heavy unmanned aircrafts and heavy maintenance equipment. Most of the available portable airfields are used in remote areas where existing runway or airport infrastructure is limited or non-existent. The use of mats to construct an airfield depends on many factors, such as ground conditions, the type and weight of aircraft being deployed, the expected usage levels, and the time available to construct the airfield.The objective of this report is to provide a practical perspective on construction and performance characteristics of some available portable roads and airfields systems that can be used to solve temporary and semi-permanent transport problems. Literature results are presented to educate the readers on available systems’ types and the best uses of each system in different applications.
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| 8. |
- Kuttah, Dina K, 1975-
(författare)
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Assessing the interactions among factors affecting the light-weight deflectometer measurements
- 2023
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Ingår i: Bulletin of Engineering Geology and the Environment. - : Springer. - 1435-9529 .- 1435-9537. ; 82:6
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Tidskriftsartikel (refereegranskat)abstract
- Many different factors can influence the outcomes of light-weight deflectometer (LWD) tests. Some of these factors are specific to the type of the used LWD, while others are related to the testing conditions. This paper summarizes the findings of a detailed investigation into the relationships between variables altering the measurements of the light-weight deflectometer test. Field testing was performed to investigate the effect of the sensing configuration (measurement of plate vs ground surface) and testing configuration (in terms of applied load magnitude, number of loadings, and moisture content). To accomplish this objective, a number of in situ LWD and moisture content investigations were conducted on two selected construction materials, namely, sandy subgrade soil and unbound granular material. Considering the multiple influencing factors involved in this study and the material dependency, relationships between the plate deformations and ground deformations could be developed, something which will help in overcoming the standardization problem of various LWD devices and their effect on the compaction control process. © 2023, The Author(s).
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| 9. |
- Kuttah, Dina K, 1975-
(författare)
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Assessing the Use of By Product Foundry Sand in Asphalt Mixtures
- 2022
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Ingår i: Proceedings of the 7th International Conference on Civil Structural and Transportation Engineering (ICCSTE'22). - : Avestia Publishing. ; , s. 8-
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Konferensbidrag (refereegranskat)abstract
- It is well known that recycling of by-product materials saves natural resources, reduce by-product volumes, and reduce the need to virgin materials. The steel industry produces a myriad of metal components for industrial chains, which in turn generates mineral discarded sand molds. Although these sands are clean before their use, after casting they may contain contaminants. Therefore, huge quantities of excess by-product foundry sand (BFS) end up occupying large volumes in landfills. In Sweden, approximately 200000 tonnes of excess BFS end up in landfills. The transportation and construction industries have the greatest potential for reuse by-products because they use vast quantities of earthen materials annually. Accordingly, an experimental work has been undertaken to evaluate the possible use of two chosen BFS from two Swedish foundries in a conventional Swedish asphalt mixture. The experimental procedure of this research has focused on the dosage, environmental and technical properties of the same mixture type ABT 11 and the same bitumen (160/220) but at different replacement proportions of the conventional fine sand with the two BFS. The environmental requirements in addition to the technical requirements, namely, void ratio, static indirect tensile strength ratio, and resilient modulus before and after moisture induced sensitivity tests of the asphalt mixtures have been investigated in the current study. The test results demonstrated that the BFS from both foundries can be incorporated in the selected asphalt mixture at specified replacement proportions of the conventional fine sand fraction 0-2 mm as discussed in the paper.
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| 10. |
- Kuttah, Dina K, 1975-
(författare)
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Bärighetskontroll av obundna material med koppling till M-E beräkningar : Enkel och snabb utvärdering av obundna materialegenskaper
- 2020
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Det här projektet bestod av två huvudsakliga delar. Projektets första del fokuserade på att utvärdera ett nytt försöksförfarande där dynamiska egenskaper hos obundna material uppskattas med hjälp av lätt fallvikt (LWD) som är en enkel och tidsbesparande utrustning jämfört med t.ex. triaxialförsök och som kan användas både i fält och i laboratorium. Arbetet fokuserade på att hitta nya samband så att resultaten från cykliska LWD-försök ska kunna användas som input i programvara för mekanistisk-empirisk dimensionering av vägöverbyggnader. Studien visade att för det sand- och bärlager som användes i försöken, så var deformationsmodulen mätt med LWD starkt korrelerad med styvhetsmodulen, mätt med dynamiskt triaxialförsök under liknande betingelser.Den andra delen av projektet har ägnats åt att korrelera parametrar som samlats in med LWD och CBR med konventionella parametrar som samlats in med traditionella tester, så som modifierad Proctor och statisk plattbelastning. Projektets andra inriktning har fokuserat på dynamiska CBR försök som utförs för att kontrollera materialstabiliteten och se om man kan få fram en uppskattning av sambandet mellan det dynamiska CBR värdet och andra egenskaper hos de testade materialen. Det har visat sig att laboratorievärden för dynamisk CBR (CBRLD) kan ha en god korrelation med densitet och vattenhalt vid packning för både sand och obundet bärlager för ett brett spektrum av vattenhalter. Regressionsmodeller som tagits fram för dessa samband. En bra korrelation har också hittats mellan Ev2 uppmätt från statiskt plattbelastningsförsök med Evd från LWD-försök för packade sandjordar och bärlager. Ytterligare forskning krävs dock för att kunna generalisera de erhållna sambanden.
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