Experimental investigation of adhesive-based self-healing of cementitious materials

Abstract

This paper presents the results of a series of self-healing experiments conducted on reinforced mortar beams containing adhesive-filled glass reservoirs. An overview of the findings of the preliminary investigation stage of experiments is given in addition to the results of a parametric study which investigates the effect of the level of reinforcement and loading rate on the amount of self-healing. Results show that both primary and secondary healing occurs during the first and second loading cycles respectively. Qualitative results also show clear evidence of the occurrence of crack-healing following the first loading cycle and new crack formation during the second loading cycle. The long-term motivation for this work is to provide data suitable for the development of a numerical material model for the autonomic healing process in cementitious materials.

Robust Self-Healing Concrete for Sustainable Infrastructure

“…Indeed the glass tubing approach may be considered a variant of chemical encapsulation as an alternative form of healing agent delivery approach, with the advantage of potentially carrying a larger amount of healing agent compared with microcapsules. Various chemicals including methyl methacrylate (Dry and McMillan 1996), ethyl cyanoacrylate (Li et al 1998;Joseph et al 2010) and polyurethane combined with an accelerator (van Tittelboom et al 2011) have demonstrated the ability of recovering concrete mechanical and transport properties. These chemicals are chosen to have low viscosity so that the healing agents can leak from the fractured glass tube into the concrete crack to perform the self-healing.…”

“…As noted above, the healing agent is not limited to chemicals, but could be biological (Wang et al 2012). Evidence of self-healing was based on mechanical reloading of beam elements that show a rebound of stiffness and/or strength (Li et al 1998;Joseph et al 2010;Van Tittelboom et al 2011) and a reduction of permeability coefficient (Van Tittelboom et al 2011).…”

“…Also, this technique is not repeatable since the glass tubes would most likely be emptied during the first loading cycle. It has been shown that self-healing using this approach leads to recovery of both transport and mechanical properties, however, it is not 100% efficient and the healing under repeated damage was minimal (Li et al 1998;Joseph et al 2010;Van Tittelboom et al 2011).…”

Self-Healing Ability of High-Strength Fibre-Reinforced Concrete with Fly Ash and Crystalline Admixture

“…Many self-healing approaches, including autogenous, adhesive-based, mineral admixtures-based, and bacteriabased methods, have been developed [7]. There are two mechanisms for self-healing in concrete such as autonomous healing and autogenous healing [10][11][12]. Autogenous healing is a natural process which heals small cracks depending upon the composition of the concrete.…”

Un nouveau béton auto-cicatrisant grâce à l’incorporation de bactéries

“…On parle alors de « cicatrisation autonome ». Ainsi, divers agents cicatrisants, majoritairement de nature chimique, ont été dé-veloppés et appliqués avec succès dans les matériaux cimentaires [1,13,14]. Plus récemment, la possibilité d'utiliser un agent cicatrisant d'origine biologique a été considérée [15][16][17][18].…”