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Advisory Committee Chair

Fouad H Fouad

Advisory Committee Members

Robert W Peters

Cristopher J Waldron

Document Type

Thesis

Date of Award

2020

Degree Name by School

Master of Science in Civil Engineering (MSCE) School of Engineering

Abstract

Centrifugal casting (spinning) produces concrete which is denser and of higher strength than that produced by traditional static-casting due to the reduced water/cement ratio and lower void content. High-strength concrete is now used commonly in the production of spun prestressed poles due to the resulting increased durability and resistance to weathering, reduction in cross-sectional area, reduced weight (ease of transport), and economic benefits. Correlation factors relating the increased compressive strength and modulus of elasticity of spun high-strength concrete to that of static-cast concrete have primarily been restricted to a cure time of 28 days in existing studies. The primary objective of this thesis is to evaluate the mechanical properties of centrifugally cast concrete, study its behavior, and develop spun correlation factors for compressive strength and modulus of elasticity over multiple curing ages using a high strength concrete mix. Spun specimens of 8” diameter and 16” length were compared to static hollow cylindrical specimens of the same dimensions and standard 4”x 8” test cylinders. Spun correlation factors were developed for compressive strength and modulus of elasticity over a number of curing ages, namely 1, 7, 28, and 56 days. Further, reductions in water/cement ratio and increase in density of the materials resulting from the centrifugal casting process were evaluated. Additional testing was conducted to study the behavior of centrifugally cast high-strength concrete. Specifically, the inner mortar or slurry layer that forms in some cases in spun concrete due to the induced centrifugal forces was assessed by evaluating its physical and mechanical properties.

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