Title: Durability of Cement Systems Reinforced with Wollastonite Microfibers
Author(s): J. J. Beaudoin, P. Gu, N. M. P. Low, and N. P. Mailvaganam
Publication: Symposium Paper
Appears on pages(s): 81-96
Keywords: cements; durability; mechanical properties
The performance of wollastonite-reinforced portland cement-based binders hydrated in saturated Ca(OH)2 solution, 1N NaOH solution, 1N KOH solution, distilled water and saturated moist air was evaluated as a precursor to the development of a test for assessing the durability of these composites. The cementitious binders are made of cement and silica fume. The effect of the different solutions on the mechanical behavior and microstructural characteristics of the systems investigated at 24 degrees Celsius and 80 degrees calicoes was determined. Porosity and pore structure determinations were made using mercury intrusion porosimetry, helium pycnometry, and isopropyl alcohol saturation techniques. Flexural strength and fracture toughness behavior was also determined. Pore structure modifications, leaching effects and mechanical test results were stability of wollastonite micro-fibers in cement binders. Wollastonite microfiber appears to merit serious consideration as a candidate reinforcement for the development of new composite systems.