Intelligent Soil Compaction Systems (2010) / Chapter Skim
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0 9.1 Overview NCHRP Project 21-09, "Intelligent Soil Compaction Systems," involved extensive field testing and analysis to better understand roller-integrated CCC and IC and to develop recommended specifications for the use of roller-integrated CCC in QA of soil and aggregate base material compaction. The quality of constructed earthwork materials is clearly critical to the performance of pavements.
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A considerable body of literature exists pertaining to roller vibration, roller-integrated measurement systems, roller modeling, and correlation of roller MVs to spot-test measurements. The modeling of vibratory roller-soil interaction has evolved with experimental studies of roller behavior.
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Roller MV uncertainty will influence the establishment of QA criteria for spatial differences in pass-to-pass roller MVs as described in Chapter 7. Roller-integrated measurement of soil stiffness is not currently standardized (i.e., magnitude and rate of loading, etc.)
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havior within the bulb of soil reflected in roller MVs. In base, subbase, and subgrade structures, modulus varies widely from layer to layer and within layers.
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areas of positive MV-A dependence (MVs increased with increasing A) and negative MV-A dependence (MVs decreased with increasing A)
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point measurements were not statistically significant in the analysis. Moisture content was found to be significant for two nongranular subgrade layer test beds and one granular base layer test bed.
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Acceptance testing for all specification options is performed on evaluation sections. Proper selection of evaluation sections that exhibit consistently distributed heterogeneity (or homogeneity)
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Figure 9.1. Summary of roller-integrated CCC specification options.
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with Option 1 to improve reliability. Similarly, specification Option 2b uses the percentage change in spatial roller MV data as the basis for QA.
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