This report is a series of bond pull-out tests to assess the effect of contaminants on bond strength.
How clean must rebar be? The results may surprise most inspectors. Without such data, most inspectors take a conservative approach by requiring removal of such materials from rebar. But removing contaminants is time-consuming, and if construction contaminants aren’t detrimental to bond, their removal may not be necessary.
A typical setup for a pull-out test included a tension/compression frame used to apply the load to the rebar. Slip of the rebar was measured with an electronic digital indicator.
Instead of pulling out of the concrete specimen, the rebar broke in eight of the nine sets of three tests. The tests were with with 100% contaminant coverage of the rebar for the worst possible case. Under these conditions, the contaminants didn’t adversely affect bond.
Hill and Griffith Customer Service
We're known for our hands on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water concrete form release, non-petroleum concrete form release, biodegradable concrete form release, rust inhibitors and concrete dissolver products that suit your needs.
Product Samples
We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
Contact Us »
Technical Services & Support
On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
Contact Us »
