Portland Cement Versus Expansive Cement in Post-Tensioned Concrete Structures

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Title: Portland Cement Versus Expansive Cement in Post-Tensioned Concrete Structures

Author(s): Mark W. Hoffman

Publication: Special Publication

Volume: 64

Issue:

Appears on pages(s): 205-238

Keywords: columns (supports); concrete slabs; creep properties; expansion; expansive cement concretes; expansive cements; modulus of elasticity ; post-tensioning; prestressing; prestress loss; shrinkage; shrinkage-compensating concretes;

Date: 7/1/1980

Abstract:
All concrete structures are affected by shrinkage and creep; post-tensioning introduces elastic shortening as well. This paper compares the effect of volume changes on structures using expansive cement concrete and conventional cement concrete. The primary focus of the paper is to show that the use of expansive cement concrete can minimize the induced moments created by volume changes. A structural example is used to compare these effects. A series of concrete bars tested for the amount of expansion that occurs in restrained and unrestrained conditions is discussed. A computer program used to perform a stiffness analysis on frames using sectional properties and displacement loadings (shortening or expansion movements) is described.