01334257

Component

This paper presents data analysis for Hot Mix Asphalt (HMA) Intelligent Compaction (IC) using various techniques, including review of geospatial data, conventional statistics and geostatistics, and univariate and multivariate linear regressions. Studies from seven HMA IC demonstration sites under the FHWA and Transportation Pooled Funding (TPF) IC project are presented. These studies have shown benefits of IC technologies, including 1) providing real-time display of color-coded maps for roller passes, pavement surface temperatures, and roller-integrated measurement values (RMVs) that cover 100 percent of compaction area to facilitate decision making; 2) improving rolling patterns to obtain consistent and uniform compaction; 3) identifying weak spots by mapping the existing support layer prior to HMA paving for just-in-time corrective actions; and 4) overcoming difficulties of compaction during night paving. Furthermore, compaction curves from test trips are established to determine the optimal roller passes for a specific HMA mixture and site condition, which prevents under-compaction and over-compaction. IC technology also provides geospatial data for evaluating compaction uniformity via geostatistical analyses. Based on semivariogram results, it shows that compaction uniformity improves from the “ground up”, i.e. subbase, HMA base, then HMA surface courses. Correlation results show that RMVs increase with the increase of in-situ HMA densities and moduli or the decrease of falling/light weight deflectometer (FWD/LWD) deflections. The multivariate correlation results show that RMVs are generally influenced by multiple factors including site conditions and machine settings. Among many recommendations for future improvement, RMV models need to calibrate temperature effect and decouple stiffness for each pavement layer.

01329018

11-1262

English

14p

2011

Transportation Research Board 90th Annual Meeting

DVD

References (13) ; Tables (11)

Compaction; Compactors; Data analysis; Hot mix asphalt; Pavements; Paving; Road construction; Rollers; Values in measurement

Intelligent compaction

Construction; Highways; Pavements; I52: Construction of Pavements and Surfacings

Transportation Research Board Annual Meeting 2011 Paper #11-1262

TRIS, TRB

Feb 17 2011 5:44PM