Research Activities: 1999

Effects of Contaminants on Bond Characteristics of Deformed Reinforcing Bars




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Sequential Number


Identification Number


Matching Research Agency


Principal Investigator

Abdeldjelil Belarbi, Associate Professor
Civil Engineering
University of Missouri-Rolla
Room 304 Civil Engineering,
Rolla, MO 65409
p(573) 341-4478
f(573) 341-4729

Student Involvement

Two (2) M.S. students

Project Objective

To study the effects of contaminants on bond characteristics of deformed rebar's and to provide recommendations to construction industry about the level of care required when rebar's are exposed to contaminants.

Project Abstract

Steel reinforcement is usually required by specification to be free of contaminants, such as form release agents, oil, and cement splatter. A considerable amount of money is spent each year for protecting and cleaning steel. However, there is limited evidence indicating that contaminants do not significantly impact bond strength. If it could be conclusively proven that this level of care is unnecessary, the industry would benefit greatly, in construction costs. It is proposed that a study be conducted by the Department of Civil Engineering at the University of Missouri-Rolla (UMR) to determine whether contaminants affect bond strength. The study would include four levels of variables: type of contaminant, bar size, concrete strength, and whether epoxy coated or not. This last variable would be of particular interest to the transportation industry because of the use of epoxy-coated rebar in bridge structures.

Task Description


Anticipated Benefits

If it were proven that contaminants will not affect the bond strength of rebar's and the additional care is unnecessary, the industry would benefit greatly, in construction costs.

Modal Orientation



Project Start Date:01/01/2000
Project End Date:12/31/2001

Relationship to other Research/Projects

The study of bond characteristics of FRP rebar is one of the ongoing research projects carried by the investigator. This project is similar in experimental layout but different in scope.

Technology Transfer Activities

Findings will be published in ACI and construction-related journals and pertaining information will be shared with the Associated General Contractors and if necessary recommendations will be made for improved construction specifications.

Transportation Research Board Keywords

Steel reinforcement, form release agents and cement splatter