Abstract
The goal of the work was to describe properties of asphalt-cement concrete (ACC) with reclaimed asphalt pavement (RAP), Portland cement, sand, and rubber powder (RP), as a material to base courses of road pavements. The mixtures were designed with the RAP in the amount of 75, 80, and 85% (m/m) and chosen cement-sand-rubber (CSR) mortar. Three CSR mortars were composed with cement CEM 42.5 R in the amount 29% (m/m); washed sand 0/2 mm in the amount 29, 35, or 41%; rubber powder of granulation 0/1 mm in the amount of 18, 24, or 29% (m/m); and water in the amount 12% fulfilled w/c = 0.4. The optimum moisture content of the selected ACC with CSR mortar determined in the modified Proctor compaction test was approximately 6% and maximum dry density 2.000 g/cm3. Laboratory tests of indirect tensile strength, stiffness modulus (IT-CY and 4PB-PR), water resistance, fatigue life, and complex modulus (E*) at different temperatures were conducted and analyzed. The test results are presented, among others, in the form: the isotherm of complex modulus, Black curve, the master curve, and the Cole-Cole plot.
Highlights
Association (EAPA) in early 2020 on the reuse and recycling of old asphalt pavements showed that of the 49.5 million tons of recovered reclaimed asphalt pavement (RAP) available in these countries, 76% was used to produce new bituminous mixtures and 20% was recycled in unbound road layers and other engineering applications
According to the work summary, all tested properties showed a significant improvement compared to typical “hot” asphalt pavement mixes in the first days of asphalt-cement concrete (ACC) hardening the pavement should be protected from heavy vehicle loads due to insufficient indirect tensile strength, which increases rapidly during the first seven days
Asphalt-cement concrete with cement-sand-rubber mortar should both fulfil the requirements for indirect tensile strength at temperature 5 ◦ C after 7 days
Summary
Bituminous mixtures and to a lesser extent for “cold” technology. The use of RAP as an aggregate substitute in road asphalt concrete (HMA and WMA) in the USA was initially allowed from 10 to 20% [1]. Unfractionated RAP has been used in Texas as a replacement for aggregate up to 30% [2]. Data provided by 16 countries to the European Asphalt Paving. Association (EAPA) in early 2020 on the reuse and recycling of old asphalt pavements showed that of the 49.5 million tons of recovered RAP available in these countries, 76% was used to produce new bituminous mixtures and 20% was recycled in unbound road layers and other engineering applications. This paper is focused on “cold” recycling
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