Mechanisms of creep in fibre-reinforced Strain-Hardening Cement Composites (SHCC): Fid-Bau Portal

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Mechanisms of creep in fibre-reinforced Strain-Hardening Cement Composites (SHCC)

Zijl, G.P.A.G. Van / Boshoff, W.P.

Fibre-reinforced Strain-Hardening Cement Composites (SHCC) form a relatively new class of High Performance Fibre-Reinforced Cement-based Composites (HPFRCC), receiving intensive research attention internationally. It is imperative that the time-dependent behaviour of these modern composites is understood in terms of the fundamental mechanisms, allowing the derivation of accurate prediction models. The tensile creep behaviour of SHCC is reported in this contribution. The authors have performed rate and creep tests on the macro-level on dumbbell specimens, as well as on the single fibre level. Hereby, the time-dependent fibre pull-out has been identified as an important mechanism of time-dependent deformation under sustained load. A second rate-effect is caused by the rate-dependence of matrix cracking, postulated to dominate in the micro-crack width range. The fibre-pull-out rate effect is considered to dominate at large deformations, when cracks widen beyond the micro-range. A model for creep of SHCC is proposed and elaborated. The model is shown to realistically capture rate-enhanced tensile resistance, as well as tensile creep fracture.

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Mechanisms of creep in fibre-reinforced Strain-Hardening Cement Composites (SHCC)

Zijl, G.P.A.G. Van / Boshoff, W.P.

Fibre-reinforced Strain-Hardening Cement Composites (SHCC) form a relatively new class of High Performance Fibre-Reinforced Cement-based Composites (HPFRCC), receiving intensive research attention internationally. It is imperative that the time-dependent behaviour of these modern composites is understood in terms of the fundamental mechanisms, allowing the derivation of accurate prediction models. The tensile creep behaviour of SHCC is reported in this contribution. The authors have performed rate and creep tests on the macro-level on dumbbell specimens, as well as on the single fibre level. Hereby, the time-dependent fibre pull-out has been identified as an important mechanism of time-dependent deformation under sustained load. A second rate-effect is caused by the rate-dependence of matrix cracking, postulated to dominate in the micro-crack width range. The fibre-pull-out rate effect is considered to dominate at large deformations, when cracks widen beyond the micro-range. A model for creep of SHCC is proposed and elaborated. The model is shown to realistically capture rate-enhanced tensile resistance, as well as tensile creep fracture.

Mechanisms of creep in fibre-reinforced Strain-Hardening Cement Composites (SHCC)

Zijl, G.P.A.G. Van / Boshoff, W.P.

Fibre-reinforced Strain-Hardening Cement Composites (SHCC) form a relatively new class of High Performance Fibre-Reinforced Cement-based Composites (HPFRCC), receiving intensive research attention internationally. It is imperative that the time-dependent behaviour of these modern composites is understood in terms of the fundamental mechanisms, allowing the derivation of accurate prediction models. The tensile creep behaviour of SHCC is reported in this contribution. The authors have performed rate and creep tests on the macro-level on dumbbell specimens, as well as on the single fibre level. Hereby, the time-dependent fibre pull-out has been identified as an important mechanism of time-dependent deformation under sustained load. A second rate-effect is caused by the rate-dependence of matrix cracking, postulated to dominate in the micro-crack width range. The fibre-pull-out rate effect is considered to dominate at large deformations, when cracks widen beyond the micro-range. A model for creep of SHCC is proposed and elaborated. The model is shown to realistically capture rate-enhanced tensile resistance, as well as tensile creep fracture.

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Title:

Mechanisms of creep in fibre-reinforced Strain-Hardening Cement Composites (SHCC)

Additional title:

Kriechmechanismen in faserverstärkten kaltverfestigten Zement-Verbundwerkstoffen (SHCC)

Contributors:

Zijl, G.P.A.G. Van (author) / Boshoff, W.P. (author)

Published in:

Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures, International Conference on Creep, Shrinkage and Durability of Concrete and Concrete Structures, 8 ; 753-759

Publication date:

2009

Size:

7 Seiten, 11 Bilder, 19 Quellen

ISBN:

978-0-415-47586-0

Type of media:

Conference paper

Type of material:

Print

Language:

English

Keywords:

Zugkriechen , Bildungsmechanismus , faserverstärkter Beton , Kaltverfestigen , Hochleistungsbeton , Zement , Vorhersagetheorie , Langzeitverhalten , Verformungsgeschwindigkeit , Rissbildung , Mikroriss , Kriechbruch , Simulationsmodell , Faserausziehverfahren

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