Self-healing efficiency of cementitious materials containing tubular capsules filled with healing agent

Abstract It has been estimated that, in Europe, 50% of the annual construction budget is spent on rehabilitation and repair of the existing structures [1] . Therefore, autonomous crack healing of concrete, a construction material that is highly susceptible to cracking, would be desirable. In this research, an encapsulated healing agent was embedded in the mortar matrix to obtain self-healing properties. Upon crack appearance, the capsules break and the healing agent is released, causing crack repair. By means of Computed Tomography and visual observation of the crack faces, filling of the cracks with healing agent was observed. It was seen that more than 50% of the original strength and stiffness could be regained after self-healing. It was also found that the water permeability could be reduced by a factor 102 to 104 due to autonomous crack healing. As a consequence, the proposed technique may be used for partial restoration of concrete properties after cracking.

[1]  S. Shah,et al.  Permeability of cracked concrete , 1999 .

[2]  J. Kretzschmar,et al.  Fabrication and oxygen permeability of gastight, macrovoid-free Ba0.5Sr0.5Co0.8Fe0.2O3−δ capillaries for high temperature gas separation , 2010 .

[3]  Carolyn M. Dry,et al.  A COMPARISON OF BENDING STRENGTH BETWEEN ADHESIVE AND STEEL REINFORCED CONCRETE WITH STEEL ONLY REINFORCED CONCRETE , 2003 .

[4]  Sybrand van der Zwaag,et al.  An Introduction to Material Design Principles: Damage Prevention versus Damage Management , 2007 .

[5]  Tran Diep Phuoc Thao,et al.  Implementation of self-healing in concrete – Proof of concept , 2009 .

[6]  Martin van de Ven,et al.  Electrical conductivity of asphalt mortar containing conductive fibers and fillers , 2009 .

[7]  Tomoya Nishiwaki,et al.  Development of Self-Healing System for Concrete with Selective Heating around Crack , 2006 .

[8]  Processing and performance of self-healing materials , 2009 .

[9]  Anthony Duncan Jefferson,et al.  ISSUES RELATING TO THE AUTONOMIC HEALING OF CEMENTITIOUS MATERIALS , 2007 .

[10]  W. Verstraete,et al.  Use of bacteria to repair cracks in concrete , 2010 .

[11]  V. Cnudde,et al.  Software tools for quantification of X-ray microtomography at the UGCT , 2007 .

[12]  Yun Mook Lim,et al.  Feasibility study of a passive smart self-healing cementitious composite , 1998 .

[13]  Carolyn M. Dry,et al.  Matrix cracking repair and filling using active and passive modes for smart timed release of chemicals from fibers into cement matrices , 1994 .

[14]  V. Cnudde,et al.  UGCT: New X-ray radiography and tomography facility , 2007 .

[15]  Carolyn M. Dry,et al.  Design of self-growing, self-sensing, and self-repairing materials for engineering applications , 2001, SPIE Micro + Nano Materials, Devices, and Applications.

[16]  Carolyn M. Dry,et al.  Three-part methylmethacrylate adhesive system as an internal delivery system for smart responsive concrete , 1996 .

[17]  Tomoya Nishiwaki,et al.  FUNDAMENTAL STUDY ON DEVELOPMENT OF INTELLIGENT CONCRETE CHARACTERIZED BY SELF-HEALING CAPABILITY FOR STRENGTH , 2000 .

[18]  S. Zwaag.  Self‐Healing Materials , 2007 .