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Enhancing the longevity of our built infrastructure will undoubtedly reduce the impact of mankind¡¯s activities on the stability of the biosphere. Attempts to justify fundamental and risky research by promising the solutions of the serious environmental problems faced by society today may sound a bit modish. This, however, should not keep us from starting this research. Not starting this research will worsen the situation. Moreover, a direct benefit for many parties involved in the building industry and for society as a whole is conceivable if it were possible to improvethequality and servicelife ofconcretestructures.Historically,the concrete in these structures has been designed to meet predefined specifications at the start of its life. Longevity of the structure is then monitored through maintenance programs. More recently, however, material scientists have begun to adopt a change in philosophy whereby adaptability or ¡®¡®self-healing¡¯¡¯ of the material over time is explicitly considered. The inspiration for this change has often come from nature through biomimicry. In concrete, early research in this self-healing area has focusedon boththe natural ability ofhydratestoheal cracks overtime,and artificial means of crack repair from adhesive reservoirs embedded within the matrix. |
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