Influence of clogging on the hydrologic performance of a double layer porous asphalt

Abstract

Nowadays, the increasing urbanisation and the effect of climate change in cities has been a constant concern. In particular, the floods cause a significant increase in surface runoff, mostly on roads and parking areas. As an alternative to asphalt pavements, usually used in these areas, permeable pavements have been developed with Porous Asphalt (PA). These pavements allow the infiltration of water from the surface to the ground due to the high void content of the PA, thus reducing the surface runoff and increasing recharge of groundwater. Over the years, the infiltration capacity of the mixtures decreases with the clogging by sediments from the vehicles themselves and/or from the local environment. In order to mitigate this effect, a Double Layer Porous Asphalt (DLPA) was developed. This research intends to deepen the knowledge about the influence of the clogging of a DLPA, with respect to the infiltration capacity, since it is an essential theme in the pavements lifespan and that needs to be developed. This study considered different evaluation phases of the infiltration capacity with two clogging cycles (500 and 1000 g/m2). The materials used were: sand, region soil, and rubber waste. The infiltration capacity test was performed in different phases after a rainfall event of 100 mm/ h with a rainfall simulator developed for this purpose. Furthermore, the permeability test with the falling head permeameter was carried out in parallel, obtaining outflow times for each clogging phase and subsequent maintenance phase. The research concluded that DLPA has a high infiltration capacity after the first clogging cycle in both performed tests. In the second clogging cycle, the results show that the infiltration decreased due to the partial filling of the pores, mainly, for the rubber-filled DLPA. The type of clogging material influences the infiltration capacity, nevertheless partially recovered after simple maintenance was performed.

Evaluation of Fracture Properties of One and Two-Layer Porous Asphalt Subjected to Clogging

“…Finally, the fracture toughness, Klc, of the mixture was calculated as an average of the Klc,i values using Eq. (5).…”

“…The TLPA specimens were found to better resist clogging compared to OLPA specimens. Afonso et al, [5] investigated the hydrological performance of TLPA. Their results showed that the type of clogging cycles and materials significantly affects the infiltration capacity of TLPA.…”

Numerical simulation study on pore clogging of pervious concrete pavement based on different aggregate gradation

“…Pervious concrete (PC) generally contains no or minimal fine aggregate; due to the low cement content, coarse aggregates can form a large number of interconnected pores [1], so rainwater can freely infiltrate into the PC pavement and reduce the problem of urban waterlogging [2]. With time, different types of clogging material will be transported to the interior of a PC pavement under the action of rainwater or natural settlement [3], which will eventually reduce the permeability of PC and seriously reduce the service life of the pervious pavement [4].…”

Optimization of anti-clogging pervious pavement structure based on numerical evaluation

“…Some studies show that the noise reduction performance of double porous asphalt pavement was improved with the decrease of aggregate size distribution of the top layer [31]. The double layer porous asphalt has a good hydrological performance, and it was able to reduce the surface runoff from a precipitation of 100 mm/h, and the sand and soil used did not significantly affect its infiltration capacity [32].…”