A Review of Software in Flexible Pavement Design

This review gives an overview of some free and commercial software which used in road design such as AASHTOW Software, PAVERS Software, CIRCLY Software, PAKPAVE software, IITPAVE Software, KENPAVE software, PaveXpress software Win PAS 12 software, Street Pave, MXROAD Suite, and Infra works software. Using a software system in design will solves the problems of design and analyzing on-road and also eliminate road failure.


Introduction
The design of flexible pavement depends on different factors that affect the strength and CBR value of the subgrade soil such as load, properties of soil, environmental and climatic factors. Using flexible pavement is necessary to ensure road safety in a large city and will help to save time and avoid difficulties and errors which might happen during the design. Therefore, the objective of this study is to evaluate different software used in flexible pavements design. Software is helping to design the various pavement layers thickness.

Literature Review
The design of the flexible pavement needs to make different experimental tests and calculations which might occur a lot of errors during the design phase and that a result of road failures. Therefore, flexible pavement software needs to be used to avoid the failure of the road design. Srikanth 2015, using KENPAVE software to examine the effect of modulus of elasticity and surface layer thickness on the performance of the pavement. The results showed that compressive and tensile strains decreased as surface thickness increasing.

Pave Xpress
PaveXpress is a useful program which used to determine the necessary pavement thickness for any section of roadway or project. It created with support from the National Asphalt Pavement Association and the State Asphalt Pavement Associations. The software needs basic inputs to provide designs for flexible and rigid pavements such as layer thickness, sub grade soil type (Chris, 2015).

AASHTOW
AASHTOW is a good software which is designed by transportation professionals for transportation professionals. It can calculate stresses, strains, and deflections based on traffic, climate, and materials parameters to predict the problems of pavement distresses. The pavement engineer can use detailed traffic, materials and environmental information to assess performance of a pavement design instead of http://www.scholink.org/ojs/index.php/se Sustainability in Environment Vol. 6, No. 2, 2021 29 Published by SCHOLINK INC.

PAVERS
Pavers software is used for pavement design, construction evaluation and maintenance. Pavers software is a good analytical pavement design which provides evaluation and design of road. The software can provide different information such as develops and organizes the pavement inventory, assess the current condition of pavements, develop models to predict future conditions, and also report on past and future pavement performance (Almuhanna et al., 2018).

Win PAS 12
WinPAS 12 is a program that is based on the AASHTO 1993 method of performs concrete and asphalt pavement designs. Different parameters affect the design of pavement by using this software which is the traffic load that has the highest impact on pavement thicknesses, followed by the subgrade strength, reliability and design life (Moon et al., 2020).

CIRCLY
CIRCLY is the main flexible pavement design software for roads and highways. It provides an accuracy of results of pavement design. The software can calculate the cumulative damage by the total traffic including any combination of vehicle types and loads. It can show the thickness for pavements at any traffic loads designed (Wardle, 2010).

Street Pave
StreetPave software based on the American Concrete Pavement Association (ACPA) thickness design for concrete highway and street pavements, and the Portland Cement Association (PCA) method. (Moon et al., 2020).

MXROAD Suite
MXROAD Suite is a good software that can give an accurate design of all types of roads. Itcan be used on a wide variety of highway projects which provides modeling integrated with CAD, mapping, and GIS. (DASS, S., 2010).

Infra works software
Infra works are civil infrastructure software which is considered as one of the important software used to design the roads, planning and design infrastructure projects (Eliseev et al., 2017).