Ritesh Bisen
Independent Researcher
India
ABSTRACT
This manuscript presents a comprehensive analysis of pavement distress assessment using the Benkelman Beam deflection method in flexible pavements. The study aims to evaluate the structural capacity and performance of pavement sections under repeated wheel loads by measuring surface deflections and correlating them with distress indicators such as cracking, rutting, and permanent deformation. Field investigations were carried out on three representative pavement sections constructed between 2008 and 2012, differing in subgrade strength, layer thickness, and traffic loading. Deflection measurements were recorded at the pavement centerline using a standard Benkelman Beam apparatus at mid-axle and dual-wheel positions. The data were processed to compute deflection basins, back-calculated layer moduli, and performance indices. The results indicated that sections with weaker subgrades exhibited higher deflections and accelerated distress development. A regression-based model was developed to predict distress severity from measured deflections, showing an R² of 0.87. The study confirms the efficacy of the Benkelman Beam method for structural evaluation of in-service pavements and provides a decision-making framework for maintenance prioritization.
KEYWORDS
Benkelman Beam, Pavement Distress, Deflection Method, Back-Calculation, Structural Capacity, Flexible Pavements
REFERENCES
- (1993). Guide for Design of Pavement Structures. American Association of State Highway and Transportation Officials.
- ASTM D836. (2012). Standard Test Method for Deflection Testing of Flexible Pavements Using the Benkelman Beam. ASTM International.
- Basu, R., & Kharouk, W. (2014). Comparison of Benkelman Beam and Falling Weight Deflectometer for Flexible Pavement Evaluation. Journal of Transportation Engineering, 140(3), 04014006.
- Huang, Y. H. (2004). Pavement Analysis and Design (2nd ed.). Prentice Hall.
- Hussain, R., & Ferreira, L. (2015). Influence of Subgrade Stiffness on Pavement Distress: A Field Study. International Journal of Pavement Engineering, 16(5), 395–403.
- Indian Roads Congress. (2013). Guidelines for the Design of Flexible Pavements. IRC:37-2012.
- Kadiyali, L. R. (2011). Traffic Engineering and Transport Planning (4th ed.). Khanna Publishers.
- Kennedy, T. W., & Read, J. (2009). Pavement Deflection and Modulus Backcalculation. Transportation Research Record, 2111, 15–24.
- Liu, H., & Xu, J. (2016). Field Evaluation of Flexible Pavements Using Benkelman Beam Method. Journal of Infrastructure Systems, 22(1), 04015024.
- Viswanatha, N. (2012). Back-Calculation of Pavement Layer Moduli from Benkelman Beam Deflections in Indian Conditions. Indian Journal of Engineering and Materials Sciences, 19(2), 115–123.
