In-situ Spot Test Measurements and Icmvs for Asphalt Pavement: Lack of Correlations and the Effect of Underlying Support

Abstract

The main aim of this paper is to analyse the performance of different intelligent compaction measurement values (ICMVs) and compare them with spot test measurements for asphalt pavement. To accomplish this, a two-layer asphalt testbed was constructed using an instrumented double-drum roller. All ICMVs [compaction meter value ( ), compaction control value ( ), roller-integrated stiffness ( ), and vibratory modulus ( )] were calculated using the same accelerometer data collected during the construction of the asphalt testbed. A novel method using the cross-correlation technique was developed to estimate the phase lag between the excitation force of the roller drum and the ground reaction, which is required for and calculations. The analysis of ICMV data showed a strong correlation between and , while and demonstrated a strong correlation only when double jump of the roller drum did not occur. Further, none of the ICMVs recorded during the last roller pass of asphalt compaction showed an acceptable correlation with asphalt densities [measured using a non-nuclear density gauge (NNDG)], mainly due to the influences of the underlying support and asphalt temperature on ICMVs. A correction method to decouple the influence of underlying support on was developed and validated using existing data from the literature. The applicability of this method for different field scenarios was demonstrated using numerical modelling.

An Intelligent Compaction Analyser: A versatile platform for real-time recording, monitoring and analysing of road material compaction

“…After a few trial and error iterations, we created a working prototype that can capture 21 parameters, including 5 ICMVs that have not been recorded in one platform in the past. The ICA platform has the capability to facilitate correction methods to decouple the effect of underlying support (i.e., the existing layers below the compaction layer) on the ICMVs of the material layer that is being compacted 24 . In addition, the platform is retrofittable and is in modular form, making it easily mountable on any existing vibratory roller.…”