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Temperature dependence of viscoelastic Poisson’s ratio of cement mortar

Journal Article · · Materials and Structures
Abstract

Concrete creep research has focused primarily on uniaxial response. However, biaxially prestressed concrete structures are common, resulting in a multiaxial stress state that can complicate the behavior of a viscoelastic material like concrete. Significant creep strains may be induced in directions transverse to each principle stress due to Poisson’s effect. Past research is unclear regarding the viscoelastic or viscoplastic properties of concrete outside of uniaxial response. It has been reported in separate studies that concrete viscoelastic/viscoplastic Poisson’s ratio (VPR) is an increasing, decreasing and constant function with time, with all reported measurements performed at room temperature. In this paper, the 3D basic creep response of mature cement mortar is examined using a confined compression experiment that allows direct determination of the full stress and infinitesimal strain tensors in a single test, which enables the determination of VPR under a multiaxial stress state. For this purpose, a unique, miniature version of the standardized concrete creep frame is designed that is amenable to placing in climate chambers and temperature ovens. The experimental results indicate that the VPR of sealed, mature cement mortar is nearly constant and equal to the elastic at room temperature, while the VPR gradually increases with time when measured at 60 °C.

Sponsoring Organization:
USDOE
OSTI ID:
1846208
Alternate ID(s):
OSTI ID: 1850504
Journal Information:
Materials and Structures, Journal Name: Materials and Structures Journal Issue: 3 Vol. 54; ISSN 1359-5997
Publisher:
Springer Science + Business MediaCopyright Statement
Country of Publication:
France
Language:
English

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