Evaluating Mechanical Properties of Earth Material During Intelligent Compaction (2020) / Chapter Skim
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1 Evaluating Mechanical Properties of Earth Material During Intelligent Compaction Satisfactory pavement performance can only be assured with an appropriate process control to ensure that compacted materials meet proper density and stiffness requirements. The primary tool currently used for quality management of earthwork and unbound aggregates is the nuclear density gauge (NDG)
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2 Evaluating Mechanical Properties of Earth Material During Intelligent Compaction Objective The main objective of this research was to develop procedures to estimate the mechanical properties of the geomaterials using IC technology in a robust manner so that DOTs can incorporate it in their specifications. Summary of Activities The research process emphasized practicality and sought to establish field processes and analysis algorithms suitable for considering the attributes of a diverse range of geomaterials.
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Summary 3 were used as part of the development of the forward and inverse models and the validation of the proposed approach for extracting the mechanical properties of compacted materials. The sites were instrumented with embedded geophones to investigate the relationship between roller measurements and the developed numerical models for calibration purposes.
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4 Evaluating Mechanical Properties of Earth Material During Intelligent Compaction nonlinear geomaterial constitutive models on the pavement responses. Correlations were established among the responses of the different models and the obtained relationships were evaluated to simplify the modeling.
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Summary 5 Field Evaluation Four test cells at the MnROAD test track facility were instrumented. Test sections were built with full-scale construction equipment to simulate normal highway construction.
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6 Evaluating Mechanical Properties of Earth Material During Intelligent Compaction Extraction of Mechanical Properties A robust backcalculation technique to extract the mechanical properties without excessive processing time during the mapping of the compacted layers was developed. The stiffness (equivalent to a modulus of subgrade reaction)
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Summary 7 • Due to large diversity in construction practices and material types, the implementation of the draft specification requires more localized field studies by DOTs to adopt it to their local materials and construction practices. Based on this study and interaction with the highway agencies, the following comments and suggestions can be made: • This research study provides a critical review of the strengths and concerns about the implementation of a specification to extract the mechanical properties of compacted materials using IC technology.
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