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
Chat with Us Online Now
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: Statistical Methods for In-Place Strength Predictions by the Pullout Test
Author(s): William C. Stone, Nicholas J. Carino, Charles P. Reeve
Publication: Journal Proceedings
Appears on pages(s): 745-756
Keywords: aggregates; compressive strength; concrete construction; lightweight aggregates; pullout ests; regression analysis; statistical analysis.
Abstract:Pullout tests and comapnion cylinder tests were conducted to examine the variations in ultimate load with respect to concrete strength, and provide experimental data for the development of a new statistical procedure for predicting in-place compressive strengrth from the pullout test. The coeeficants of variation were found to be relatively constant with average values of 4 percent for cylinder tests and approximately 10 percent for pullout tests in concrete with hard coarse aggregates. Pullout test in lightweight concrete exhibited coefficants of variation of only 6 percent. Two test series were conducted with river gravel aggregate using apex angles of 54 and 70 deg. Both geometries produced coefficants of variation of 10 percent. A statistical procedure is developed for determining the correlation equation which accounts for: 1) the constant coefficants of variation in ultimate load, and 2) the X-variable (pullout load) error. Aprocedure is also developed to predict the in-place caracteristic strength to any desired confidence level. Amethod is presented to dtermine the appropriate number of in-place tests to be performed for a given concrete placement. A recommended minimum number of 8 to 12 pullout tests per 76 cubic meters (100 cubic yards) is proposed.
Click here to become an online Journal subscriber