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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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