Sustainable Green Pavement Using Bio-Based Polyurethane Binder in Tunnel

Abstract

As a closed space, the functional requirements of the tunnel pavement are very different from ordinary pavements. In recent years, with the increase of requirements for tunnel pavement safety, comfort and environmental friendliness, asphalt pavement has become more and more widely used in long tunnels, due to its low noise, low dust, easy maintenance, and good comfort. However, conventional tunnel asphalt pavements cause significant safety and environmental concerns. The innovative polyurethane thin overlay (PTO) has been developed for the maintenance of existing roads and constructing new roads. Based on the previous study, the concept of PTO may be a feasible and effective way to enrich the innovative functions of tunnel pavement. In this paper, the research aims to evaluate the functional properties of PTO, such as noise reduction, solar reflection and especially combustion properties. Conventional asphalt (Open-graded Friction Course (OGFC) and Stone Mastic Asphalt (SMA)) and concrete pavement materials were used as control materials. Compared with conventional tunnel pavement materials, significant improvements were observed in functional properties and environmental performance. Therefore, this innovative wearing layer can potentially provide pavements with new eco-friendly functions. This study provides a comprehensive analysis of these environmentally friendly materials, paving the way for the possible application in tunnels, as well as some other fields, such as race tracks in stadiums.

Initial Field Validation of Poroelastic Pavement Made with Crumb Rubber, Mineral Aggregate and Highly Polymer-Modified Bitumen

“…A schematic diagram of variables taken into account during each stage is shown in Figure 2. The design of the mineral mixtures was based on Instead of polyurethane epoxy resins used as binders in previous research programs [5,[19][20][21] a highly SBS-modified bitumen 45/80-80 containing approximately 7.5% of SBS was used. While conventional modified binder has a continuous bitumen phase, highly modified binder has a continuous polymer phase.…”

“…An additional valuable feature of PERS pavements is its positive impact on safety in the event of a vehicle fire associated with spillage of fuel [4]. A PERS surface prevents the spread of fire and reduces its intensity (size of the flames) and even leads to smaller smoke contribution [5]. This feature promotes the use of these surfaces in tunnels and petrol stations.…”

Eco-Friendly Asphalt Approach for the Development of Sustainable Roads

“…Transportation is the primary need of human beings and developing sustainable transportation facilities is of main concern [23]. As a closed space, the functional requirements of the tunnel pavement are very different from ordinary pavements, e.g., a higher requirement on the reduction of the pavement noise, proper light reflection to ensure safety and save tunnel lighting energy, closure of the construction process, better pollutant discharge and air purification [24]. The construction industry consumes a large number of resources and energy, in contrast to other sectors of the contemporary economy [25].…”

Mechanical and Microscopic Characteristics of Polyurethane-Based Pervious Pavement Composites

“…PU materials are widely used in the construction industry at present given their low cost and stable properties. In particular, the high tensile strength of PU is expected to lead to various performance improvements, including better durability and constructability [ 24 , 25 , 26 ]. PU-based PPM with varying aggregate sizes was produced and the compressive strength and permeability of each specimen were measured.…”