By Eric P. Koehler David, W. Fowler
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Extra resources for AGGREGATES IN SELFCONSOLIDATING CONCRETE
Admixture performance can be strongly dependent on cement characteristics. 49) where a, b, and d are empirical factors. Cubic C3A was included because it is considered more reactive than orthorhombic C3A. Although C3S is less reactive than C3A, it was included because it is sufficiently reactive and is available in large quantity. The cubic C3A and C3S are multiplied by the Blaine fineness to reflect the amount of reactive material on the surface of the cement grain. 4 Supplementary Cementitious Materials SCMs are often used in SCC to decrease cost, improve workability, reduce heat of hydration, and improve durability.
At a constant slump—and, therefore, at a higher water content—the use of limestone dust decreased compressive and flexural strengths and increased shrinkage. 2 Empirical Approaches to Selecting Aggregates The numerous empirical approaches to selecting aggregates may be applicable in whole or in part to proportioning SCC. Many of the approaches described in the literature in the past century our now considered outmoded. This section describes packing density, the excess paste theory and its derivatives, the Shilstone method, water requirement equations, and the ACI 211 method.
1: Constitutive Relationships for Fresh Concrete Plotted on a Flow Curve The Bingham model is the most widely used constitutive relationship for concrete due to its simplicity and its ability to represent concrete flow accurately for the majority of cases (Ferraris 1999). 1) In practical terms, yield stress represents the amount of stress to initiate or maintain flow while plastic viscosity describes the resistance to flow once the yield stress has been exceeded. Increased plastic viscosity results in greater resistance to flow.