Experimental Study on Cementitious Composites Embedded with Organic Microcapsules

The recovery behavior for strength and impermeability of cementitious composites embedded with organic microcapsules was investigated in this study. Mortar specimens were formed by mixing the organic microcapsules and a catalyst with cement and sand. The mechanical behaviors of flexural and compression strength were tested. The results showed that strength could increase by up to nine percent with the addition of a small amount of microcapsules and then decrease with an increasing amount of microcapsules. An orthogonal test for investigating the strength recovery rate was designed and implemented for bending and compression using the factors of water/cement ratio, amount of microcapsules, and preloading rate. It is shown that the amount of microcapsules plays a key role in the strength recovery rate. Chloride ion permeability tests were also carried out to investigate the recovery rate and healing effect. The initial damage was obtained by subjecting the specimens to compression. Both the recovery rate and the healing effect were nearly proportional to the amount of microcapsules. The obtained cementitious composites can be seen as self-healing owing to their recovery behavior for both strength and permeability.

[1]  Xianming Shi,et al.  A self-healing cementitious composite using oil core/silica gel shell microcapsules , 2011 .

[2]  Brendon Weager,et al.  A new system for crack closure of cementitious materials using shrinkable polymers , 2010 .

[3]  Carolyn M. Dry,et al.  Three designs for the internal release of sealants, adhesives, and waterproofing chemicals into concrete to reduce permeability , 2000 .

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

[5]  Henk M. Jonkers,et al.  Self Healing Concrete: A Biological Approach , 2007 .

[6]  N. Sottos,et al.  Autonomic healing of polymer composites , 2001, Nature.

[7]  Masanori Iiba,et al.  Experimental study on enhancement of self-restoration of concrete beams using SMA wire , 2003, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[8]  Toshiharu Kishi,et al.  Crack Self-healing Behavior of Cementitious Composites Incorporating Various Mineral Admixtures , 2010 .

[9]  F. Vermolen,et al.  A mathematical model for bacterial self-healing of cracks in concrete , 2014 .

[10]  G. Muyzer,et al.  Application of bacteria as self-healing agent for the development of sustainable concrete , 2010 .

[11]  Björn Johannesson,et al.  A review : Self-healing in cementitious materials and engineered cementitious composite as a self-healing material , 2012 .

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

[13]  Tang Luping,et al.  Chloride Transport in Concrete - Measurement and Prediction , 1996 .

[14]  S. Bang,et al.  A new method for controlling leaching through permeable channels , 1995 .

[15]  Diane Ruth Gardner,et al.  Self-healing cementitious materials: a review of recent work , 2011 .

[16]  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 .

[17]  Tomoya Nishiwaki,et al.  Development of Engineered Self-Healing and Self-Repairing Concrete-State-of-the-Art Report , 2012 .

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

[19]  Henk M. Jonkers,et al.  Quantification of crack-healing in novel bacteria-based self-healing concrete , 2011 .

[20]  Akira Hosoda,et al.  SELF-HEALING BEHAVIOUR BY CEMENTITIOUS RECRYSTALLIZATION OF CRACKED CONCRETE INCORPORATING EXPANSIVE AGENT , 2007 .

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

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

[23]  K. Van Breugel,et al.  IS THERE A MARKET FOR SELF-HEALING CEMENT- BASED MATERIALS? , 2007 .

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

[25]  Nancy R. Sottos,et al.  Mechanical Properties of Microcapsules Used in a Self-Healing Polymer , 2006 .