Development of Deflection Prediction Model for Interlocking Concrete Block Pavements

Abstract

Interlocking concrete block pavement (ICBP) is one of the pavement types adopted worldwide, as it is economical and exhibits improved structural performance. The primary objective of the present study was to develop a deflection prediction model for ICBP considering the most influential parameters using the plate load test. The finite element method (FEM) based software PLAXIS was also employed to predict the plate load deflection to reduce laboratory cost and time. Statistical analysis was carried out to assure the identical deflection values between the laboratory plate load test and FEM analysis. Sensitivity analysis was performed to finalize the most significant parameters for developing the deflection prediction model using the Design Expert software. Two deflection models were predicted for zigzag shape blocks with two laying patterns: stretcher and herringbone. The model was developed in SPSS software by performing 1,680 trial experiments. The results from ANOVA statistical analysis proved that the developed model possessed a significant fit for a 95% confidence level. The predicted deflection model was validated using field deflection measurements obtained from four different roads using Benkelman beam deflection (BBD) and light weight deflectometer (LWD). Statistical two-tailed test results proved that the predicted deflection model was compatible with the observed field deflection value.