Toughening of Cement Composites with Wollastonite Micro-Fibers

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Title: Toughening of Cement Composites with Wollastonite Micro-Fibers

Author(s): Vikram Dey, Amir Bonakdar, Mehdi Bakhshi and Barzin Mobasher

Publication: Special Publication

Volume: 319

Issue:

Appears on pages(s): 10.1-10.16

Keywords: wollastonite, fracture, shrinkage, digital image correlation, fibers, crack width

Date: 6/1/2017

Abstract:
Wollastonite, a calcium meta-silicate mineral with acicular microstructure can be used in cementbased materials for micro-reinforcing the brittle matrix. Contribution of wollastonite particles in toughening and crack mitigation of cement mortar systems in its early age and hardened state, were studied. Elaborate testing was conducted to quantify the ability of wollastonite to restrain early age plastic shrinkage cracking, and fracture toughness of hardened cement mortar materials. Microstructural investigations on these blended systems validated the contribution of these wollastonite particles in the enhancement of mechanical properties through classical toughening mechanisms such as crack bridging, fiber pullout and rupture. Keywords: