A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A new look at tensile creep of fiber-reinforced concrete
Creep of concrete is composed of basic and drying creep components, and the drying creep is primarily caused by two mechanisms: stress induced shrinkage and microcracking. The effects of steel fibers on basic creep, stress induced shrinkage, and microcracking components for two concrete mixtures with w/c of 0.4 and 0.5 are discussed. The steel fibers were found to enhance the basic creep mechanisms and reduce the drying creep mechanisms. The reduction in drying creep offsets the increase in basic creep leading to a net tensile creep similar for both plain concrete and FRC; a conventional conclusion that usually obscures the role of fibers on shrinkage stress relaxation and cracking. A new look that is consistent with material behavior is introduced by dividing the creep mechanisms into beneficial aspects associated with real creep mechanisms and detrimental aspects associated with apparent creep mechanisms (microcracking). Basic creep and stress-induced shrinkage are real creep mechanisms associated with deformation of hydration products, while microcracking is detrimental because of the associated microstructural damage. Steel fibers tend to enhance the beneficial mechanisms and reduce the detrimental ones, thus enhancing the overall performance. The results explain the difference in shrinkage cracking between plain concrete and FRC; an insight that would not be achieved by looking at total tensile creep alone.
A new look at tensile creep of fiber-reinforced concrete
Creep of concrete is composed of basic and drying creep components, and the drying creep is primarily caused by two mechanisms: stress induced shrinkage and microcracking. The effects of steel fibers on basic creep, stress induced shrinkage, and microcracking components for two concrete mixtures with w/c of 0.4 and 0.5 are discussed. The steel fibers were found to enhance the basic creep mechanisms and reduce the drying creep mechanisms. The reduction in drying creep offsets the increase in basic creep leading to a net tensile creep similar for both plain concrete and FRC; a conventional conclusion that usually obscures the role of fibers on shrinkage stress relaxation and cracking. A new look that is consistent with material behavior is introduced by dividing the creep mechanisms into beneficial aspects associated with real creep mechanisms and detrimental aspects associated with apparent creep mechanisms (microcracking). Basic creep and stress-induced shrinkage are real creep mechanisms associated with deformation of hydration products, while microcracking is detrimental because of the associated microstructural damage. Steel fibers tend to enhance the beneficial mechanisms and reduce the detrimental ones, thus enhancing the overall performance. The results explain the difference in shrinkage cracking between plain concrete and FRC; an insight that would not be achieved by looking at total tensile creep alone.
A new look at tensile creep of fiber-reinforced concrete
Altoubat, S.A. (author) / Lange, D.A. (author)
2003
17 Seiten, 13 Bilder, 3 Tabellen, 18 Quellen
Conference paper
English
Creep Deformation of Fiber Reinforced Plastics-Plated Reinforced Concrete Tensile Members
| Online Contents | 2005
Creep Deformation of Fiber Reinforced Plastics-Plated Reinforced Concrete Tensile Members
| British Library Online Contents | 2005
Tensile Creep Test of Fiber-Reinforced Ultra-High Performance Concrete
| British Library Online Contents | 2010
Uniaxial tensile creep of a cracked polypropylene fiber reinforced concrete
| Springer Verlag | 2018
Uniaxial tensile creep of a cracked polypropylene fiber reinforced concrete
| Online Contents | 2018