Curing and Load Performance of Adhesives Anchor Systems Installed at Low Temperatures

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Title: Curing and Load Performance of Adhesives Anchor Systems Installed at Low Temperatures

Author(s): Ingo Alig, Dirk Lellinger, Frank Bohm, Ralf Neuerburg, and Friedrich Wall

Publication: Special Publication

Volume: 283

Issue:

Appears on pages(s): 1-14

Keywords: Adhesives, anchor, concrete, curing, load performance, low base material temperatures.

Date: 3/1/2012

Abstract:
The paper is related to basic understanding of curing and load performance of adhesive anchors with special focus on thermosetting systems cured at low base temperatures. Simulations of non-isothermal curing kinetics, vitrification and softening of the adhesives are compared to results of sustained load tests. Based on models for the reaction kinetics of thermosetting materials – considering the transition from mass to diffusion controlled curing regime – and a relation between glass transition temperature and chemical conversion the “curing-induced” vitrification was simulated for different temperature programs. The temperature programs are based on meteorological data and experimentally determined heating rates of concrete. In the simulations curing times, curing temperatures and heating rates were systematically varied. The simulated “vitrification” and “softening times” are compared to sustained load tests performed under the same conditions. The test results support the assumptions of our model which provide at least a qualitative prediction of the adhesive performance after different thermal or meteorological history. The behavior of thermosetting anchor systems cured at low base temperatures followed by fast heating is explained in terms of the competition between softening and post curing.