Waste composite poly-methyl methacrylate filled with a fine dispersion aluminium trihydrate (PMMA/ATH) and Fischer-Tropsch wax were used as modifying agents for a 70/100 paving grade bitumen employed for road paving. The effect of modifying agent content, primary ageing and long-term oxidative ageing on rheological and mechanical properties of base and modified bitumen were studied. The rutting resistance at high service temperatures was analyzed with oscillatory shear tests and multiple stress creep recovery measurements. Waste PMMA/ATH powder proved suitable for bitumen modification, particularly in combination with wax. Moreover, aluminium trihydrate is a flame retardant material. PMMA/ATH is less susceptible to heat and oxygen, therefore modified bitumen samples show improved viscoelastic and physical characteristics compared to base bitumen at handling and in-service temperatures.
COBISS.SI-ID: 5069338
This paper presents the result of the Tensile Stress Restrained Specimen Tests on specimens of asphalt concrete AC 8 with bitumen 50/70 depending on two starting temperature of +10°C and +20° C. The analysis of the results shows that there is only a non significant difference between these two start temperatures and the results are within the limit of standard presicion. On the other hand, there is a difference between the results of two laboratory TU Wien and ZAG Ljubljana, who carried out the tests in accordance with EN 12697-46 at start temperature +20°C
COBISS.SI-ID: 519638297
The subject invention is bitumen with the addition of PMMA/ATH composite dust. PMMA/ATH composite powder is, according to the invention, added to the bitumen, which is used in asphalt mixtures, in order to improve properties of asphalt mixtures. The invention belongs to the field of asphalt. Modified bitumen, according to the invention contains the following ingredients in percentage by weight: from 50% to 99.9% (w/w) binder, which is mostly bitumen, and from 0.1 to 50% (w/ ) PMMA / ATH composite powder. Bitumen properties were tested with standard tests, such as softening point test method ring&ball (EN 1427), penetration test (EN 1426) and Fraass breaking point (EN 12593). Tests at 25% (w/w) content of PMMA/ATH composite dust in the bitumen showed a 7.4 ° C increase in temperature softening point (EN 1427) and a 4 ° C decrease in temperature of Fraass breaking point (EN 12593) with respect to the base bitumen. Rheological tests at 60 ° C showed an increase in rut formation parameter of G*/sin (). Basic bitumen has rut formation parameter 1330 Pa, at 25% (w/w) content of PMMA/ATH composite dust in the bitumen measured value of rut formation parameter 3650 Pa, which is almost three times greater resistance to the formation of ruts as base bitumen.
COBISS.SI-ID: 5121818