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.
F.07 Improvements to an existing product
COBISS.SI-ID: 5121818With laboratory tests, we found that the PMMA/ATH composite dust can be used as a replacement or additive to the filler. With high hardness, resistance to most chemicals, mechanical and heat-resistance of PMMA/ATH composite dust improves virtually all measured properties of asphalt mixtures. We demonstrated that the PMMA/ATH composite dust as replacement or additive to the filler increase the adhesion between the stone aggregates and bitumen, thus increasing the stiffness of asphalt mixture, and also resistance to fatigue. In the laboratory, we have prepared a preliminary composition for the base course of asphalt (AC base 22 B 50/70) and the previous composition of the asphalt wearing course (AC surf 8 B 50/70) that meet the requirements of Slovenian standards. It is known that by using more accurate simulations we can not accurately predict how some new material will behave at the production and installation, so the manufacturer of asphalt CGP in June 2009 decided to test a new material. With test production and built-in asphalt containing PMMA/ATH composite dust we needed only 6 months from the idea to test usage of secondary raw materials in asphalt. According to expectations the asphalt layers containing PMMA/ATH composite dust showed a significant improvement of mechanical properties. 3 years after building testing field we can already see that the sustainability of asphalt containing PMMA/ATH composite dust is at least equivalent to the sustainability of ordinary asphalt without this additive. With further laboratory tests, we found that the PMMA/ATH composite dust can be used as a supplement to the bitumen. With laboratory tests on bitumen we proved that PMMA/ATH composite dust could be as effective as other commercial polymer additives. PMMA/ATH composite dust significantly increases the range of applicability of bitumen that is temperature range between Fraass breaking point and softening point. With further tests it will be necessary to determine if, in the final material balance PMMA/ATH composite dust can be considered as part of the bitumen.
F.07 Improvements to an existing product
COBISS.SI-ID: 5122074Removed asphalt layers (reclaimed asphalt-RA) are usually re-used as a supplement to new mixtures of the cold or hot process. The most common is the re-use of old asphalt in hot process "mix and plant." There are different procedures to add the old asphalt, depending on the equipment of asphalt plants. In Slovenia, the asphalt plants adds to the fresh materials from 5% to 30% of the old asphalt. On the asphalt plant Podutik a trial production of asphalt mixture AC 16 surf B 70/100 A4 containg 50% RA and rejuvenator STORBIT was carried out. To the fresh material upto 50% of the old asphalt was added, that is more than usual in Slovenia. Produced asphalt mix has been built -in on a trial field, which consists of two parts. On one part is aspalt layer with RA and the second part, the same type of asphalt mix without RA. The temperature of asphalt mixture without additives was arround 170 ° C, a mixture prepared with RA and rejuvintor around 100 ° C. Lower temperature also means much less energy in the production of asphalt mixtures, and thus lower greenhouse gas emissions. When installing asphalt layers, this means lower emissions of bitumen fumes and vapors, and thus less harmful to the health of asphalt workers.
F.14 Improvements to existing production methods and tools or processes
COBISS.SI-ID: 4972314