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: In-Place Concrete Strength: New Pullout Methods
Author(s): G. Mailhot, A. Bisaillon, G.G. Carette, and V.M. Malhotra
Publication: Journal Proceedings
Appears on pages(s): 1267-1282
Keywords: anchors(fasteners); blots; bond (concrete to reinforcement); compressive strength; concrete cores; field tests; nondestructive tests; pullout tests.
Abstract:A major drawback of existing pullout tests is that they have to be preplanned during the design and erection of formwork. To overcome these problems, investigations were undertaken to develop pullout tests that could be carried out on finished structures. Three possible approaches considered were: (A) pulling out of tapered anchors placed in drilled holes; (B) pulling out of bolts set in hardened concrete using epoxy; and (C) measuring the force required to cause shear failure of concrete using a split-sleeve assembly. The techniques were tried on 25 concrete slabs. The concrete covered a strength range from 17 to 42 Mpa. More than 1000 pullout tests using the three techniques were performed. Technique A gave relatively poor results in terms of reproduciblity. It also had some inherent difficulties, and was discontinued. Technique B appears promising. It is believed that this approach is viable but furthur research is needed. Technique C offers good possiblites and the simplicity of the test makes this method more attractive. However, within-test variations were higher than those obtained with Technique B. Modifications of procedures may reduce the variations.
Click here to become an online Journal subscriber