United States Department of Transportation
i
Numerical Simulation of Intelligent Compaction Technology for Construction Quality Control
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2014-12-01
[PDF-1.20 MB]
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Abstract:Intelligent compaction (IC) technique is a fast-developing technology for compaction quality control and acceptance. Proof rolling using the intelligent compaction rollers after completing compaction can effectively identify the weak spots and significantly improve the uniformity of the compacted layers. Despite many federal and state funded studies to implement the IC technology, there are still obstacles and gaps that need to be explored and overcome in order to fully employ this technology in the day-to-day operations. What is fundamentally missing from most efforts is an attempt to understand the behavior of the IC roller responses and their correlations to the other modulus-based devices, such as the light-weight deflectometer (LWD). To better understand the process of accepting compacted materials to ensure quality, performance and durability using IC technology, a finite element model was developed to document and understand the theoretical limitations and sensitivity of this technology in order to develop more rigorous specifications. The influence depth for both IC and LWD was studied as well as the level of sensitivity of the stiffness or modulus as measured by these instruments. The nonlinear constitutive model parameters seem to have significant influence on the measured influence depth.
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