Measuring the Rheological Properties of Self-compacted Concrete using Direct Shear Box
Proceedings of Fourth National Conference on Road and Infrastructure 2019 (ISBN: 978-93-5367-163-1)
8 Pages Posted: 20 May 2019
Date Written: April 4, 2019
Abstract
Flow characterization and controlling fresh property of SCC is most critical. Even slight variations in ingredients can have an adverse effect on fresh properties; strength and durability of hardened concrete. The material science approach to study rheological properties is essential in order to overcome the paucity posed while characterizing mixes by empirical methods such as the slump flow test.
In the present work, the Bingham parameters of SCC were assessed by using the direct shear box. The SCC mixes were designed with a constant volume of paste 0.38 (powder type SCC) based on absolute volume concept. The two water contents of 185 and 205 lt/cum and cement contents of 300,375 and 450 kg/cum along with slag as filler was used. A unique test procedure was followed, by applying low normal stresses of 0.025, 0.050 and 0.10 MPa with three different displacement rates of 0.25, 0.625 and 1.25mm/min under static condition. The results indicate that the direct shear box shall effectively put to use, as an additional instrument for evaluating the rheological properties of SCC.
Keywords: Bingham model, Rheological properties, Direct shear box
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