In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Feedback via Email
Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Analysis of Cover Meter Data
Author(s): Donald E. Dixon
Publication: Special Publication
Appears on pages(s): 47-64
Keywords: computer programs; cover; pachometers; regression analysis; reinforced concretes; reinforcing steels; statistical analysis.
Abstract:The cover meter, commonly known as the pachometer, is a useful instrument in locating steel reinforcing bars within concrete members. The instrument works on the principle that steel bars present in the developed magnetic flux field will cause a meter deflection. The larger the steel bar or the closer it is to the probe, the larger the meter deflection. Many times the cover meter is used to locate steel to minimize the chances of cutting the reinforcing during coring operations. At other times, it is desirable to learn the placement of the bars for structural reasons, such as times when the loading of a structure is being changed and the reinforcing placement is not known, for rehabilitation of older structures, or in times of controversy when the quality of construction is questioned. The paper analyzes data for a project in which the placement of reinforcement was questioned. A correlation was established for the cover meter for the meter reading and the measured cover. Statistical analysis of the data was used to 1) establish a regression model, 2) learn the expected accuracy of a reading, and 3) establish a meter reading that would have a specified confidence for a desired cover. Since the cover data included a range of values for reinforcing bars relatively close to the surface to three inches or more below the surface, a statistical analysis of the instrument's variability for differing bar depths was made.
Click here to become an online Journal subscriber