المؤلفون: Oliwia Merska, Paweł Mieczkowski, Stanisław Majer

المصدر: Archives of Civil Engineering, Iss No 1, Pp 201-217 (2024)

مصطلحات موضوعية: bottom asphalt layer, compactibility, gyratory compactor, locking point, stone mastic asphalt, Engineering (General). Civil engineering (General), TA1-2040

الوصف: The physical properties determining the strength parameters of bituminous mixtures are strongly influenced by the processes of placement and compaction. The effectiveness of this process depends on the compactive effort and is directly related to the mixture temperature. This research focused on the assessment of compactibility of mixtures designed for reflective crack relief interlayers (RCRI) which, in most cases, are applied in thin layers. The materials analysed for compactibility in this research included AC – asphalt concrete, AC AF – asphalt concrete “anti-fatigue”, SMA – stone mastic asphalt and SMA-MA – stone mastic asphalt rich in bitumen mastic. The gyratory compactor method was used to determine the compaction slope K, the locking point LP and the compaction densification index CDI. All the tested mixtures were fine-graded, i.e., contained grains up to 8 mm in diameter, each mixed with a different type of bituminous binder. The values of CDI show a substantially greater input of energy required for compaction of high-polymer modified mixtures, as compared to mixtures of the same design, yet containing the 50/70 bitumen. Locking point analysis showed that SMA and SMA-MA mixtures attain 98% relative compaction before reaching the locking point at which the aggregate skeleton starts to resist further compaction. This is quite the opposite as with the AC and AC AF mixtures. Among the tested mixtures the best compaction behaviour was observed in the case of SMA-MA 8 50/70, and this over a wide range of working temperature (100–160C°) and pressures (150 kPa, 600 kPa). The design of the mixture SMA-MA as an anti-fatigue layer assumes an increase in the content of filler and binder, as compared to conventional SMA. This composition is bound to reduce the resistance to compaction, i.e., provide a better compaction behaviour as compared to a conventional SMA mixture.

وصف الملف: electronic resource

العلاقة: https://journals.pan.pl/Content/130771/ACE_2024_01_11.pdfTest; https://doaj.org/toc/1230-2945Test; https://doaj.org/toc/2300-3103Test

الوصول الحر: https://doaj.org/article/7a61d84d0fce40c4b5080f9848ca9fb8Test

المؤلفون: Bartosz Budziński, Paweł Mieczkowski

المصدر: Archives of Civil Engineering, Vol vol. 68, Iss No 2, Pp 679-696 (2022)

مصطلحات موضوعية: bridge pavement, tensile creep test, relaxation time, Engineering (General). Civil engineering (General), TA1-2040

الوصف: One of the main causes of road pavement distress are low temperatures, and hence the need to thoroughly study the low temperature performance of all bituminous materials used in road construction. The purpose of this studywas to determine the performance of alternative and conventional bituminous mixtures in the temperature range between –25˚C and –10˚C using for this purpose the Tensile Creep Test (TCT). The low-temperature performance data were evaluated using the Burgers model, a tool that is widely used for evaluation of bituminous mixtures. This research focuses on bridge paving mixtures. These included both conventional (mastic asphalt) and alternative (SMAMA) materials. It was established, based on the test results and their analysis, that low temperature performance of a bituminous mixture is influenced, in the first place, by the characteristics of the asphalt binder it contains. Furthermore, SMA-MA mixtures showed better low temperature performance than conventional, mastic asphalt type mixtures.

وصف الملف: electronic resource

العلاقة: https://journals.pan.pl/Content/123631/PDF/art40.pdfTest; https://doaj.org/toc/2300-3103Test

الوصول الحر: https://doaj.org/article/5336617e5214492f93a873d9c9019969Test

المؤلفون: W. Sorociak, B. Grzesik, J. Bzówka, P. Mieczkowski

المصدر: Archives of Civil Engineering, Vol Vol. 66, Iss No 2, Pp 321-337 (2020)

مصطلحات موضوعية: reclaimed asphalt pavement (rap), rejuvenator, hot mix asphalt (hma), recycling, Engineering (General). Civil engineering (General), TA1-2040

الوصف: The problem of recycled materials application in road construction is one of the key issues in contemporary road engineering. This article describes attempts to produce a hot mix asphalt (HMA) mixture entirely from processed reclaimed asphalt pavement (RAP) material. Due to the binder ageing process, rejuvenating agent was a necessary additive to the mixture. The mixture was tested to determine its parameters, including the content of voids, fatigue life, rutting resistance, stiffness and water sensitivity. The test results demonstrated that the rejuvenated RAP mixture is not inferior to fresh produced mixtures in terms of physical and strength parameters. Such results are, however, conditional on appropriate handling of the RAP material.

وصف الملف: electronic resource

العلاقة: https://journals.pan.pl/Content/115142/PDF/Paper_788_do%20druku.pdfTest; https://doaj.org/toc/2300-3103Test

الوصول الحر: https://doaj.org/article/3052a125b2944f7c910579b875c2a0c2Test