Abstract
Strengthening and toughening efficiency contributed by calcium carbonate whisker was questioned in this study when the interfacial bonding strength between whisker and Portland cement was increased by adding silica fume. A simple proving experiment was employed and the basic mechanical properties were measured. The results showed that the compressive strength of the composites with silica fume was more sensitive to whisker loading. The flexural strength, split tensile strength and work of fracture were increased no matter with or without silica fume. However, the strengthening and toughening efficiency caused by whiskers in the composites with silica fume was lower than that without silica fume. The scanning electron microscopy images illustrated six mechanisms which can account for the strengthening and toughening effects. It is concluded that crack deflection was the efficient mechanism to toughen cement composite materials. And the interfacial bonding strength should be weak enough to introduce more crack deflection mechanism.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
