CTRE is an Iowa State University center, administered by the Institute for Transportation.

Address: 2711 S. Loop Drive, Suite 4700, Ames, IA 50010-8664

Phone: 515-294-8103
FAX: 515-294-0467

Website: www.ctre.iastate.edu/

Iowa State University--Becoming the Best

Investigation of Improved Utility Cut Repair Techniques Phase II

Compaction to achieve relative density higher than 35% (medium to dense material)


Principal investigator:

Co-principal investigators:

Project status


Start date: 06/06/06
End date: 12/12/10


Report: Investigation of Improved Utility Cut Repair Techniques Phase II (22.46 mb pdf) June 2012

Tech transfer summary: Investigation of Improved Utility Cut Repair Techniques Phase II (1.08 mb pdf) Aug 2011


Sponsor(s): Iowa Department of Transportation

About the research


Trench maintenance problems are caused by improper backfill placement and construction procedures. This report is part of a multiphase research project that aims to improve long-term performance of utility cut restoration trenches. The goal of this research is to improve pavement patch life and reduce the maintenance of the repaired areas. The objectives were to use field-testing data, laboratory-testing data, and long-term monitoring (elevation survey and falling weight deflectometer testing) to suggest and modify recommendations from Phase I and to identify the principles of trench subsurface settlement and load distribution in utility cut restoration areas by using instrumented trenches. The objectives were accomplished by monitoring local agency utility construction from Phase I, constructing and monitoring the recommended trenches from Phase I, and instrumenting trenches to monitor changes in temperature, pressure, moisture content, and settlement as a function of time to determine the influences of seasonal changes on the utility cut performance.