Restricted Research - Award List, Note/Discussion Page

Fiscal Year: 2018

1112  The University of Texas at El Paso  (74617)

Principal Investigator: Soheil Nazarian

Total Amount of Contract, Award, or Gift (Annual before 2011): $ 323,499

Exceeds $250,000 (Is it flagged?): Yes

Start and End Dates: 9/1/17 - 7/31/18

Restricted Research: YES

Academic Discipline: Civil Engineering

Department, Center, School, or Institute: Center for Transportation Infrastructure Systems

Title of Contract, Award, or Gift: OR20160056A 226370004A Assess Deflection-Based Field Testing for Project Acceptance (PS 16-53)

Name of Granting or Contracting Agency/Entity: Texas Department of Transportation

Program Title: Highway Planning and Construction
CFDA Linked: Highway Planning and Construction


Qualifies under SAM 1.1.1.TxDOT current practice for field compaction quality control and acceptance for base, subbase and soil layers is to determine the compacted density and sometimes moisture content by nuclear density gauge (NDG). TxDOT has also considered several stiffness-based devices to replace NDG because stiffness parameters are more relevant to pavement design. Spot tests cannot represent the uniformity of the compaction in a continuous manner, and less stiff areas can be easily missed. For design-build projects an additional challenging step is the design verification. The current process based on lab resilient modulus is tedious and marginally representative of the in situ moduli. Even though modulus-based nondestructive testing (e.g., with FWD, LWD or DCP) can be conceptually considered as a straightforward solution to this problem, a recent NCHRP study has shown the level of detail that is needed to consider for meaningful values from modulus-based devices. One cannot simply extrapolate the use of the modulus-based devices on existing roads to the design verification. Our primary goal is to improve the process of design verification of compacted materials to ensure quality, performance and durability using a combination of proof rolling (with or without intelligent compaction) and modulus-based devices. In close collaboration with our TxDOT partners, the research team will utilize our current expertise gained from several recent and ongoing intelligent compaction projects and our NCHRP project on the effective use of the modulus-based devices to develop practical test protocols and specifications to improve the design verification during construction.

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