Limitations on the Use of Recycled Asphalt Pavement in Structural Concrete

Abstract

Recycled materials from construction and demolition waste, such as recycled concrete aggregate, recycled brick aggregate, or recycled asphalt coming from the milling of road/motorway surfaces, are the key for a sustainable production of concrete. This paper reviews in particular the use of recycled asphalt pavement (RAP) aggregates in the production of concrete for structural uses. An overview is initially presented to describe the different areas of use of RAP, its definition and the limitations imposed by codes and standards. Relatively to the experimental data provided by the literature, a comparison with the Italian minimum requirements is also provided. Lastly, the influence of RAP on the characteristics of concrete such as compressive strength, flexural strength, Young’s Modulus and a study of durability are presented to define the possible applications of RAP in structural concrete in relation to the current allowable percentage of substitution.

Evaluating the Potential of Recycled Asphalt for Sustainable Road Construction: An Environmental and Economic Analysis

“… Smaller stone fractions 0/4, 4/8, 8/16, and 16/31;  Bitumen for road construction 50/70. Three recycled asphalt mixtures with different proportions of road bitumen (5.2%, 5.50%, and 6.10%) were studied in the laboratory to prepare test formulations [1,31]. Based on the laboratory results, an ideal granulometric composition of 4.90% 50/70 road bitumen was established following the standard EN 12697-8 and considering the percentage of voids and their filling.…”

“…Asphalt is an artificial product made from various ingredients. It has been used in the construction sector for about 125 years, especially in railroad and road construction [1]. Advances in science and technology have enabled the recycling of asphalt, thus favoring its reuse in construction infrastructure.…”

“…Advances in science and technology have enabled the recycling of asphalt, thus favoring its reuse in construction infrastructure. Recycling has resulted in extracting fewer raw materials from nature, saving energy, reducing costs, and protecting the environment [1]. The Republic of Kosovo covers an area of 10,905.25 km 2 [2].…”

Improvement of Computational Efficiency and Accuracy by Firefly Algorithm and Random Forest for Compressive Strength Modeling of Recycled Concrete

“…Hence, the application of recycled concrete as an aggregate in ECC is conducive to the sustainable improvement and progress of the construction industry. Jaawani et al [19] studied the impact of recycled asphalt pavement (RAP) on the flexural strength, CS, durability, and other performance indexes of concrete to determine the possibility of RAP being applied in structural concrete.…”

Increasing the Use of Reclaimed Asphalt in Italy towards a Circular Economy: A Top-Down Approach

“…The European average of RA reused in pavement construction currently lies at 60% [3]; however, some nations greatly outperform this average. Some examples of nations which have the highest usage of RA in pavements are Germany, France, and Spain, which report using 84%, 76%, and 72.7% of all reclaimed asphalt in pavement activities, respectively [4].…”