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. 2019 Jun 21;12(12):1990.
doi: 10.3390/ma12121990.

Sustainable Green Pavement Using Bio-Based Polyurethane Binder in Tunnel

Chao Leng  1 , Guoyang Lu  2   3 , Junling Gao  4 , Pengfei Liu  5 , Xiaoguang Xie  6 , Dawei Wang  7   8
Affiliations

Sustainable Green Pavement Using Bio-Based Polyurethane Binder in Tunnel

Chao Leng et al. Materials (Basel). .

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.

Keywords: combustion properties; noise reduction; polyurethane thin overlay; solar reflection; sustainable pavement material; tunnel pavement.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Raw materials for polyurethane (PU) specimens: (a) TiO2-coated aggregate; (b) Bio-based polyurethane binder; (c) Compaction process; (d) PU specimen.
Figure 2
Figure 2
Grain size distribution of PU, open graded friction course (OGFC), and stone mastic asphalt (SMA).
Figure 3
Figure 3
Installing the impedance tube for characterizing the noise absorption of PU samples: (a) Connecting the sample holders; (b) completely installed impedance tube device.
Figure 4
Figure 4
UV/VI/IR Spectrophotometer.
Figure 5
Figure 5
Simulation of solar radiation using an iodine tungsten lamp.
Figure 6
Figure 6
Appearance and components of the cone calorimeter.
Figure 7
Figure 7
Acoustic absorption-coefficient curves.
Figure 8
Figure 8
Simulation of solar radiation using iodine tungsten lamp.
Figure 9
Figure 9
The different reflection results of a heat reflection surface.
Figure 10
Figure 10
Comparison of ignition time (TTI) among PU, OGFC and SMA.
Figure 11
Figure 11
Comparison of heat release rate (HRR) among PU, OGFC and SMA.
Figure 12
Figure 12
Comparison of total heat release (THR) among PU, OGFC and SMA.
Figure 13
Figure 13
Comparison of the results among PU, OGFC and SMA. (a) mean for the specific extinction area (SEA); (b) total smoke release (TSR).
Figure 14
Figure 14
Comparison of fire proceeding index (FPI) among PU, OGFC, and SMA.
See this image and copyright information in PMC

References

    1. Zhang J., Wang M., Wang D., Li X., Song B., Liu P. Feasibility study on measurement of a physiological index value with an electrocardiogram tester to evaluate the pavement evenness and driving comfort. Measurement. 2018;117:1–7. doi: 10.1016/j.measurement.2017.11.060. - DOI
    1. Liu P., Otto F., Wang D., Oeser M., Balck H. Measurement and evaluation on deterioration of asphalt pavements by geophones. Measurement. 2017;109:223–232. doi: 10.1016/j.measurement.2017.05.066. - DOI
    1. Jolitz R.J., Kirk D.R. Flame Retardant Asphalt Composition. 4,804,696. U.S. Patent. 1989 Feb 14;
    1. Walters R.B. Flame Retarded Asphalt Blend Composition. 4,659,381. U.S. Patent. 1987 Apr 21;
    1. Grube L.L., Frankoski S.P. Flame Retardant Bitumen. 5,110,674. U.S. Patent. 1992 May 5;