Assessment of wollastonite microfibre on drying shrinkage behaviour of cement-based composites

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Conference Proceeding
From Materials to Structures: Advancement Through Innovation - Proceedings of the 22nd Australasian Conference on the Mechanics of Structures and Materials, ACMSM 2012, 2013, pp. 499 - 504
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To date there has been limited research carried out on the effect of wollastonite as a microfibre addition to concrete or mortar and its effect on drying shrinkage behaviour. This investigation assesses the effect of wollastonite on drying shrinkage behaviour and compressive strength development of cement-based mortars. Mortar was selected for this study as a behavioural model since it is more sensitive to shrinkage strain than cement-based composites containing coarse-sized aggregate (concrete). Specimens were prepared with the addition of wollastonite at 2%, 4% and 6% by mass of cement. Key indicators of performance evaluated were change in length relative to control mortar exposed to the same storage conditions, as well as change in mass and compressive strength assessment at ages of 7 and 28 days. Results demonstrate that drying shrinkage decreases with the addition of wollastonite, while compressive strength increases with increasing age. © 2013 Taylor & Francis Group.
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