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CONSIDERATIONS CONCERNING THE DETERMINATION AND INTERPRETATION OF MARSHALL FLOW VALUES IN ASPHALT CONCRETES
Abstract
In Romania, the European technical standards concerning the quality control of the primary materials and asphalt mixtures used in road and highway works have been harmonized. In the same time, Romanian norms were adopted. These norms set limits within which every characteristic must range, without the possibility of adopting other values, even if laboratory tests prove, in many cases, that the imposed limits do not correspond to the practical reality. Also, most Romanian road laboratories own automatic Marshall equipment for the determination of Marshall stability and flow. The software of this equipment offers two modalities of determining the flow: in relation to the maximum load reached or the displacement of the tangent to 1.5mm. In many cases there are significant differences between these two values, from fitting to the standardized values and by far exceeding these values. Based on these general considerations, the article presents the results of some laboratory research on three different grading of natural aggregates corresponding to the standards for asphalt concrete for the wearing course of public roads. Two issues that are in the Romanian specialists? attention are being discussed: if the minimum binder content required by the Romanian standard corresponds to practical conditions (bitumen types used and correlation with the other physical and mechanical characteristics), and which is the correct methodology for determining the flow, respectively.
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References7
MARC P., BELC F., ROMAN O., The Impact of fly Ashes on the Characteristics of 50/70 Bitumen, 14th International Multidisciplinary Scientific Geoconference SGEM 2014, Bulgaria, vol. II, p. 243-250, 2014.
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NIKOLAIDES A., Highway engineering: pavements, materials and control of quality, U.S.A., 2015.
RĂCĂNEL C., BURLACU A., Ecological Asphalt Mixtures With Blast Furnace Slag, 16th International Multidisciplinary Scientific Geoconference SGEM 2016, Bulgaria, vol. II, p. 33-40, 2016.
* * * Normativ privind mixturile asfaltice la cald. Condiții tehnice de proiectare, preparare și punere în operă a mixturilor asfaltice. (Standard concerning warm mixes. Technical conditions for the designing, preparing and laying asphalt mixtures) Indicative AND 605-2017, Romania, 2017.
* * * SR EN 12697-34 Metode de încercare pentru mixturi asfaltice preparate la cald Partea 34: Încercarea Marshall (Test methods for warm asphalt mixtures. Part 34: Marshall test), Romania, 2012.
* * * ASTM D6927-15 Standard Test Method for Marshall Stability and Flow of Asphalt Mixtures, U.S.A., 2015.
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