Research Articles | Challenge Journal of Concrete Research Letters

Air Permeability of Hardener-Free Epoxy-Modified Mortars Using NDT

Muhammad Aamer Rafique Bhutta
Muhammad Aamer Rafique Bhutta * Department of Structures and Materials, Faculty of Civil Engineering University Teknologi Malaysia, Malaysia
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Abstract


The purpose of this study is to investigate the airpermeability of hardener-free epoxy-modified mortars by applyinga non destructive testing method developed by RILEM Technical Committee 189-NEC. Considering intelligent patch materials for the repair work of deteriorated reinforced concrete structures, hardener-free epoxy-modified mortars using a bisphenol A-type epoxy resin without any hardener are prepared with various polymer-cement ratios, and tested for moisture content, air permeability and strength. As a result, although there is no significant strength improvement, the coefficient of air permeability of the hardener-free epoxy-modified mortars is markedly decreased with an increase in the polymer-cement ratio.

Keywords


epoxy-modified mortar; air permeability; hardener-free epoxy resin; polymercement ratio; strength

References


Ohama, Y., Demura, K., and Katsuhata, T. Investigation of microcracks self-repair function of polymer-modified mortars using epoxy resins without hardener. in Proc. of the 10th International Congress on Polymers in Concrete (CD-ROM), Eds. by D.W. Fowler, G.W. DePuy and M.A. Murray, The University of Texas at Austin, Austin, Texas, USA. 2001.

Ohama, Y., Demura, K., and Endo, T. Strength properties of epoxy-modified mortars without hardener. in Proc. of the 9th International Congress on the Chemistry of Cement, Vol. V, Performance and Durability of Concrete and Cement Systems, National Council for Cement and Building Materials, New Delhi, India. 1992. pp.512-516.

Ohama, Y., Ochi, M., Kumagai, S., and Ota, M. Strength development and epoxy resincement interaction in hardened-free epoxy-modified mortars. in Proc. of the 8th International

Symposium on Brittle Matrix Composites, Eds. by A.M. Brandt, V.C. Li and L.H. Marshall, ZTUREK RSI and Woodhead Publishing, Warsaw. 2006. pp.315-322.

RILEM Technical Committee 189-NEC (Non-Destructive Evaluation of the Penetrability and Thickness of the Concrete Cover). State-of-the-Art Report of RILEM Technical Committee 189-NEC (Non-Destructive Evaluation of the Concrete Cover), Eds. by R.Torrent and

L.Fernández Luco, RILEM Publications, Bagneux, France. 2007.

Torrent, R. and Frenzer, G. A method for rapid determination of the coefficient of permeability of the “covercrete”. in Proc. of the International Symposium on Non-Destructive Testing in Civil Engineering (NDTCE). 1995. pp. 985-992.

Hilsdorf, H. K. In-situ permeability testing of concrete, In Testing during Concrete Construction. Proc. of an International RILEM Workshop, Eds. by H.W. Reinhardt, Chapman and Hall, London, UK. 1991. pp. 311-332.

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