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Title: Workability and stability of lightweight aggregate concrete from rheology perspective
Keywords: air entrainment, lightweight aggregate concrete, rheology, segregation, slump, vibration.
Issue Date: 4-May-2006
Citation: CHIA KOK SENG (2006-05-04). Workability and stability of lightweight aggregate concrete from rheology perspective. ScholarBank@NUS Repository.
Abstract: This dissertation describes a study on workability and stability of fresh lightweight aggregate concrete. It involves using rheological parameters of Bingham model, which are yield stress and plastic viscosity, to evaluate the workability and stability of concrete under vibration. The rheological parameters are modified by a superplasticizer and an air entraining agent, and measured by a coaxial-cylinders rheometer. In general, a lower yield stress and plastic viscosity improves the workability but decreases the stability of fresh concrete. Hence, there is a need to provide information to address this dilemma in design of concrete mixtures. The beneficial use of air entrainment to improve both workability and stability is investigated from rheology perspective. Empirical relationships between the rheological parameters and slump are proposed. Influences of the density of the lightweight aggregates and water-to-cement ratio are also investigated. In addition, the effect of vibration frequency and amplitude on the stability is evaluated.
Appears in Collections:Ph.D Theses (Open)

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