Title: Behavior and Design of Single, Headed and Unheaded, Grouted Anchors under Tensile Load

Author(s): Noel A. Zamora, Ronald A. Cook, Robert C. Konz, and Gary R. Consolazio

Publication: Structural Journal

Volume: 100

Issue: 2

Appears on pages(s): 222-230

Keywords: adhesives; anchor; anchor bolt; bond; fastener; grout.

DOI: 10.14359/12486

Date: 3/1/2003

Abstract:
The purpose of this research program was to determine the behavior of grouted anchors loaded in tension and to develop rational design procedures for these types of anchors. A grouted anchor was defined as an anchor (headed or unheaded) installed into a hole in hardened concrete with a structural grout (cementitious or polymer). Grouted anchors typically have hole diameters at least 50% larger than the anchor diameter. This is different from adhesive anchors that typically use a polymer material with an unheaded anchor installed in a hole diameter less than 50% larger than the anchor diameter. This paper presents the results of 237 tension tests of both headed and unheaded anchors installed using six cementitious and three polymer grouts. Results indicate that the behavior of unheaded grouted anchors is similar to adhesive anchors, whereas the behavior of headed grouted anchors is similar to cast-in-place headed anchors. For some products, a bond failure at the grout/concrete interface is possible and needs to be considered.