Experimental Investigation on the Reuse of Reclaimed Asphalt Pavement over Weak Subgrade
- PDF / 1,562,032 Bytes
- 17 Pages / 439.37 x 666.142 pts Page_size
- 70 Downloads / 208 Views
Experimental Investigation on the Reuse of Reclaimed Asphalt Pavement over Weak Subgrade Ishfaq Rashid Sheikh 1 & M. Y. Shah 1 Accepted: 2 June 2020/ # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Reclaimed asphalt pavement (RAP) materials are a sustainable solution for highway construction and therefore gained more attention in recent years. The bearing capacity of RAP is not sufficient to withstand the applied wheel loads, resulting in excessive deformation and vertical stresses. The geosynthetic reinforcement improves the load-bearing capacity of RAP bases and makes pavement usable for traffic. This paper presents the experimental results of static plate load test on unreinforced and geocell-reinforced bases; furthermore, the geotextile functioning was also observed. The surface deformation decreases with the increase in the height of geocell and placement of geotextile. The geocell restricts the lateral movement by increasing the lateral resistance of infill material; geotextile at the interface decreases the deformation and vertical stress transferred to the weak subgrade. The geocell of different heights (10 cm, 12.5 cm and 15 cm) was used in this study with varying thicknesses of base course. The geocell and geotextile reinforcement increases the bearing capacity by 43%, 88% and 96% in the case of 12-cm-, 15-cm- and 20-cm-thick bases respectively. The average vertical stress decreases by 53% and the stress distribution angle increases from 21 to 60°. The overall findings showed that the geosynthetics improved the performance of RAP bases, making them reusable for pavement construction. Keywords Recycled asphalt pavement . Surface deformation . Vertical stress distribution .
Geosynthetics
* Ishfaq Rashid Sheikh [email protected] M. Y. Shah [email protected]
1
Department of Civil Engineering, National Institute of Technology Srinagar, Srinagar 190006, India
Transportation Infrastructure Geotechnology
1 Introduction The use of waste and byproduct materials in highway construction has grown interest to civil engineering in recent times. The reuse of reclaimed asphalt pavement (RAP) has proven to be a sustainable solution which is environment friendly and energy efficient. The use of RAP in pavement constructions has environmental and economic benefits and performs better compared with virgin aggregates (FHWA, U 2011). About 97% of RAP waste has been put in new pavement construction and 3% is being used as base course material. 110.3 million tons of RAP was produced at the end of 2018 in the USA alone; use of RAP saved about 61.4 million cubic yards of landfill space and 78 million tons of aggregates with a total cost of $2.8 billion (Williams et al. 2019). The RAP can be used as base course material in unpaved roads. Due to the presence of bitumen content in RAP, there may be excessive deformation of base course materials due to traffic loading. In order to reduce the deformation in RAP bases, geocell as reinforcement reduces the excessive deformation which makes
Data Loading...
