Performance of Porous Asphalt Mixtures Containing Recycled Concrete Aggregate and Fly Ash

Controlling environmental noise and reducing excessive noise is necessary to protect human health and provide auditory comfort. People are frequently exposed to traffic noise in their daily life and traffic noise is a considerable problem on the city scale. This study investigates the sound absorption coefficient in asphalt pavements so as to reduce traffic and environmental noise. The important parameters affecting the sound absorption coefficient in asphalt pavement, such as the use of porous asphalt pavements, clogging pores, the mixture content change, the thickness change, and getting wet, were identified. It is stated that the sound absorption coefficient in the asphalt layer can be increased with the use of a porous asphalt layer, and by changing the thickness and mixture content. In addition, with the effects of global warming, water supply problems are observable in cities. In this context, the use of rainwater is of vital importance. Permeability of the asphalt layer and storage of rainwater in the lower layer are recommended. The accumulation of rainwater with the aid of drainage in porous asphalt pavements has been investigated and the use of rainwater within the scope of recycling is explored. Within the scope of the research, the construction of porous asphalt pavements is suggested in a system that can store water, reuse rainwater with a new system proposal, and reduce environmental noise by increasing sound absorption performance. Accordingly, it will be possible to reduce the environmental noise level and to use rainwater within the scope of recycling. According to varying thicknesses, porous asphalt pavements were modeled using the finite element method, and the Von Mises stress and vertical deformation results of different thicknesses were compared.

“…Trematerra and Lombardi [45] x x Mahmud et al [46] x Lou et al [47] x x Shen et al [48] x x Kolodziej et al [49] x [50] x…”

Section: Resultsmentioning

confidence: 99%

Section: The Effect Of the Mixture Content Changementioning

confidence: 96%

Investigation of Asphalt Pavement to Improve Environmental Noise and Water Sustainability

Bozkurt

Karakaş

2022

“…They compared the results with both PAC and dense-graded asphalt pavements and found that the air temperature above the WRAC pavement was 1 to 2 • C lower than that above a nearby grassed area and 3 to 5 • C lower than that above adjacent rooftops. Elmagarhe et al [19] investigated the effects of the addition of fly ash (FA) on the overall performance of a PAC-10 mixture. They found that the addition of 4% FA reduced the PAC permeability by approximately 12% while also lowering the PAC air void content from approximately 23.5% to 22.95%.…”

Section: Introduction 1backgroundmentioning

confidence: 99%

Effect of Slope on Stormwater Infiltration into Porous Asphalt Pavements

Yang,

Hu,

Beecham

2024

Porous asphalt pavements and water-retentive asphalt pavements are widely used because of their ability to infiltrate both rainfall and stormwater runoff. There is very limited information available to assist designers of porous asphalt pavement systems to be installed on sloping sub-catchments. This is because the infiltration performance of these systems has only been investigated experimentally for horizontal pavements, and their performance on sloping terrains has only been investigated theoretically. This experimental study investigates the relationship between rainfall intensity, pavement slope, runoff and infiltration rates for dense-graded asphalt, porous asphalt and water-retentive asphalt concrete pavements. Three rates of simulated rainfall were applied to porous, water-retentive and dense-graded asphalt specimens set at three different pavement slopes, namely 0°, 3° and 5°. The relationship between the porosity and permeability of the porous asphalt pavements was also determined. A porosity of 20% resulted in a permeability of greater than 1 mm/s. It was found that the porous asphalt specimens had excellent runoff retention and infiltration rates at all slopes. The water-retentive asphalt specimens also produced good infiltration rates at horizontal slopes, but these decreased at higher pavement slopes.

“…The use of RCAs has been reported in several works, especially in granular layers [16], but also in asphalt mixtures [17] and concrete, mortars, grouts, and so on {e.g., using recycled concrete fines (mostly non-reactive) as specified in EN 197-6:2023 standard [18]}. In fact, these aggregates have already attracted interest for application in different layers and types of mixtures, mainly in bituminous base and binder courses [19], as well as in dense/semi-dense asphalt mixtures [20], in stone mastic asphalt (SMA) [21], and even in porous asphalt (PA) [22]. In the meantime, its use has been extended to a wide variety of production methods, namely, cold asphalt mixes (CMAs) [23], foamed asphalt mixtures (FAMs) [24], and warm mix asphalt (WMA) [25][26][27], in addition to "traditional" hot mix asphalt (HMA) [28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Environmental Performance of Asphalt Concrete with High Amounts of Recycled Concrete Aggregates (RCA) for Use in Surface Courses of Pavements

Martinho,

Silva,

Oliveira

et al. 2023

Using aggregates from alternative sources has been considerably encouraged in recent decades. Reducing the consumption of natural aggregates from quarries (which have a substantial economic, visual, and environmental impact) is increasingly a concern. These needs have led to the broader use of more sustainable aggregates, increasing the incorporation percentages and extending their use to more demanding pavement layers (e.g., surface). In order to prove the efficiency of recycled concrete aggregates (RCAs) under such conditions, the “CirMat” project was developed. Among other works and tests, an asphalt concrete (AC) incorporating 52.3% RCA was characterized mechanically and environmentally. Empirical properties were evaluated, including the Marshall test (S = 20.2 kN; F = 2.9 mm) and resistance to permanent deformation (WTS = 0.10 mm/103 cycles), as well as a life cycle assessment (LCA), which confirmed that nine indicators were improved (from 1% to 93%). The test samples were taken from mixtures produced in the laboratory and at a plant (after which they were applied on a construction site). Comparing the results with those obtained in a reference AC (with natural aggregates), it was possible to conclude that the performance of the AC with RCAs was very similar. Therefore, the use of these aggregates, at high rates, does not represent additional risks for asphalt mixtures and has lower environmental impacts in most categories.