Abstract
Compact tension specimens were prepared from a cement-flyash paste with an especially-high content of cenospheres, to permit examination of the details of the influence of cenospheres on the cracking pattern obtained on loading such specimens in the SEM. It was found that even after extensive aging, the advancing crack typically went around the cenosphere-paste interface rather than cleaving through the cenosphere itself. Branching of the crack on its path around the cenosphere perimeter was commonly observed. Thus, cenospheres in flyash-cement systems appear to act as energy-dissipating inclusions in fracture and do not necessarily weaken the system.
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