User Guide

8
Scenario B
(b
1
) Approved anchor or rebar system is to be installed in known and approved base
material. The designer included proof load requirements on the general notes sheet
of the structural drawing set.
Is that the right scenario for Hilti on-site testing?
The answer is a clear “yes”
Why?
A scenario where on-site testing is included (proof load) in their structural drawing
serves as one piece of the big picture of quality assurance. Injection adhesive
systems (such as epoxy mortar) have special requirements to ensure that the
adhesive is correctly mixed and dispensed. These usually include dispensing a small
quantity of adhesive from the mixing nozzle prior to injecting it into the hole. The
objective of adhesive injection is to avoid entrained air. For long holes and holes
drilled horizontally or overhead, special equipment such as extension tubes, stoppers
and end caps may be specified to achieve a void-free injection. Therefore, proper
installation techniques are needed for concrete anchors to perform as expected.
This, in general, can also be achieved if:
(a) The personnel performing anchor installation are experienced and qualified to
use the specific adhesive or anchor system being employed (such training can
be requested from Hilti). For example, in the US post-installed adhesives must
be performed by certified installers, while in Germany this certification is
limited to post-installed rebar connections.
(b) The initial installation is observed continuously, followed by periodic
inspections as the installation continues. This is rarely done in Europe.
Therefore, non-destructive on-site testing (proof loading) may be performed to
validate the installation quality of the installed fasteners according to Fig.1 and Fig. 2.
Necessary information or questions which should be stated:
What are the consequences for the case where an anchor fails the proof-load test?
These consequences should be specified upfront by the responsible engineer to
keep the construction project going.