Due to geographical position of Slovenia we are dealing with very low temperatures. According to the ARSO data, practically the whole of Slovenia has the absolute minimum air temperature with a return period of 50 years (the period from 1951 to 2005 (below -18°C, except at the seaside and in Vipava region where it is higher. According to the DRSC data the lowest measured temperature in the pavement last winter was below -16°C. This means that the occurrence of cracks in the asphalt pavements in this region is more likely to happen. In addition to low temperature the traffic in Slovenia has significantly increased in recent years, which has caused the occurrence of thermal cracks.This paper presents the results of the tests on specimens of asphalt concrete AC 11 surf B 50/70 A2/Z2 at the low temperature as a function of bitumen content. We have carried out the cooling test (Tensile Streass Restrained Specimen Test - TSRST) adn uniaxial tensile test (Uniaxial Tensile Strength Test - UTST). The analysis of the results has shown a poor correlation between the bitumen content and TSRST test results. The results of the uniaxial tensile test UTST in the dependence of bitument content indicate that the correlation depends on the test temperature. What is especially evident is good correlation between the maximum reserves of tensile strength delta beta(t,max) and temperature at the maximum reserve tensile strength T(delta beta(t,max)). At the bitumen content 4.8 m.-%. It was observed that the maximum reserves of tensile strength delta beta(t,max) has only slightly changed. Over 4.8 m.-% both of properties have drastically improved. Therefore, the 4.8 m.-% is a minimum bitumen content for our specific bituminous mixture AC 11 surf B 50/70 A2/Z2. This study shows that the bitumen content has very important influence on the properties of the bituminous mixture at the low temperatures
COBISS.SI-ID: 518969369
The subject of invention is the asphalt with the addition of PMMA / ATH composite powder, which replaces the filler or is a supplement to the filler. PMMA / ATH composite powder is added according to the invention to the filler to improve properties of asphalt mixtures. The invention falls within the scope of asphalt. The filler is the smallest sand fraction in the asphalt mixture with standardized sieving curve. Asphalt mixture according to the invention contains in weight percentage from 3% to 8% of binder, from 75% to 94% of stone aggregate with a particle size greater than the grain size of filler, from 0 % to 17% of filler, and from 0.5 to 17% of PMMA / ATH composite powder.
COBISS.SI-ID: 4621850