153424 Cement Aggregate Bond

There is now accumulated evidence that the microstructure of the interfacial zone between the cement paste and the aggregate is not so typical of the bulk paste. It is characterized by a more porous structure and oriented CH crystals and as a result is more prone to cracking, particularly under stress concentration that may occur at the interface. In the presence of MS, the interfacial zone has a denser, more uniform structure that does not appear to differ significantly from the bulk paste. The small particle size of the microstructure inhibits the development of segregated water films, which is probably the cause of the porous zone and inhibits the growth of oriented CH crystals. Similarly, the bond between the paste and other embedded materials such as fibers will also be improved.

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