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ACI, in partnership with CRSI, developed the Adhesive Anchor Installation
Certification Program in response to the “Big Dig” accident in Boston, MA.
ADHES I V E ANCHOR I NS TALLATI ON CERTI FI CATI ON P ROGRAM
11/27/2013
In the summer of 2006, a
portion of the concrete roof of
the Central Artery/Tunnel
Project in Boston, Mass., also
known unofficially as the “Big
Dig,” collapsed, killing one
woman and injuring her
husband. The National
Transportation Safety Board
(NTSB) released its accident
report soon after and made
recommendations to several
parties, including the
American Concrete Institute. The recommendation to ACI was to use its “building codes, forums,
educational materials, and publications to inform design and construction agencies of the potential
for gradual deformation in anchor adhesives under sustained tensile-load applications.”
As part of the overall
response to the
recommendations of
the NTSB, ACI has
partnered with CRSI
to develop a
certification program
for Adhesive Anchor
Installers. Adhesive
anchors are
recognized by the
structural design
profession as an
important structural
connection in many
applications.
Adhesive anchor
effectiveness is measured by the bond strength achieved between the adhesive and concrete,
and adhesive and anchor. Adhesive anchor manufacturers have developed installation
procedures for their specific products that when followed, are intended to provide the proper
conditions for the anchor system to achieve that required bond strength.
ACI and CRSI assembled a group of
Subject Matter Experts (SMEs) who
identified the criteria candidates must
meet for certification as ACI/CRSI
Adhesive Anchor Installers. Candidates
are required to complete a certification
test consisting of a 75-question written
exam and a performance exam.
exam and a performance exam.
Candidates must also be able to read,
comprehend, and execute instructions to
properly install adhesive anchors as are
typically provided by adhesive anchor
manufacturers. In addition, candidates must possess the knowledge to properly assess ambient
conditions, the condition of the concrete, materials, equipment, and tools for installing adhesive
anchors and determine when it is appropriate to proceed with an installation or when additional
guidance from a supervisor/foreman/project engineer is needed.
One of the additional resources offered
to increase awareness of adhesive
anchors was a one-day in-person
seminar, “Adhesive Anchors: Their
Behavior and Code Design
Requirements,” covered design
requirements for adhesive anchors that
were first introduced in the 2011 version
of ACI 318, “Building Code Requirements
for Structural Concrete.” The seminar
discussed the material properties of
common adhesives, lessons learned
from failures, tension and shear failure modes, capacity reduction factors, tension and shear
interaction, a qualification standard for adhesive anchors, and design of supplemental
reinforcement, as well as the importance of proper anchor installation procedures in concrete.
The ACI Online Continuing Education Unit (CEU) course “Adhesive Anchors: Reliability,
Environmental Exposure, and Hole Preparation” (http://courseweb.concrete.org/cw/openlist.asp?
#AAI2) provides information on applications, systems, prequalification tests, and characteristics
affecting bond strength of adhesive anchors as well as results of environmental creep behavior
studies. This course, as well as the Adhesive Anchor Installation CEU course provides resources
to the building community.
To learn more about ACI Certification and Education programs, visit www.concrete.org
(http://www.concrete.org/Education).
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