A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Free and restrained plastic shrinkage of cementitious materials made of engineered kraft pulp fibres
https://orcid.org/0000-0001-5946-406X
https://orcid.org/0000-0002-2752-7019
https://orcid.org/0000-0002-4262-9398
Highlights Engineered pulp fiber reinforced cementitious materials were tested for restrained and free plastic shrinkage. Engineered fibres are either mechanically modified or chemically treated. Both crack width and crack area reduced when fiber amount increased. Mechanically modified fibre was the most effective one in eliminating the surface cracks. Compressive strength of the reinforced cementitious materials reduced when kraft pulp is added.
Abstract Early age cracks caused by plastic shrinkage of cementitious materials is a major problem in concrete structures. These cracks allow ingress of water, chlorides, and other deleterious materials and minerals into the material, causing early deterioration and damage to structures. Recently, two low-cost special Kraft pulp fibres have been designed and developed for reinforcement in cementitious materials. These fibres have never been used in any previous cementitious materials. Softwood fibres are engineered by extreme refinement followed by specific modification to produce these two special fibres. The modifications are done to create numerous tiny fibrils on the surface of the fibres to help increase the bond between the fibres and the cement matrix. These fibres are called mechanically modified fibre and chemically treated fibre and they are not commercially available. The expectation is that these fibres would be successful in eliminating cracks and reducing the strain induced by plastic shrinkage in cementitious materials. Hence, this study undertook both restrained and free plastic shrinkage tests on various fibre-reinforced composites made of these two engineered fibres. Furthermore, the effect of fibre type and fibre content on compressive strength was determined. The study found that these two engineered pulp fibres are highly effective in controlling both cracks and strains induced by plastic shrinkage.
Free and restrained plastic shrinkage of cementitious materials made of engineered kraft pulp fibres
https://orcid.org/0000-0001-5946-406X
https://orcid.org/0000-0002-2752-7019
https://orcid.org/0000-0002-4262-9398
Highlights Engineered pulp fiber reinforced cementitious materials were tested for restrained and free plastic shrinkage. Engineered fibres are either mechanically modified or chemically treated. Both crack width and crack area reduced when fiber amount increased. Mechanically modified fibre was the most effective one in eliminating the surface cracks. Compressive strength of the reinforced cementitious materials reduced when kraft pulp is added.
Abstract Early age cracks caused by plastic shrinkage of cementitious materials is a major problem in concrete structures. These cracks allow ingress of water, chlorides, and other deleterious materials and minerals into the material, causing early deterioration and damage to structures. Recently, two low-cost special Kraft pulp fibres have been designed and developed for reinforcement in cementitious materials. These fibres have never been used in any previous cementitious materials. Softwood fibres are engineered by extreme refinement followed by specific modification to produce these two special fibres. The modifications are done to create numerous tiny fibrils on the surface of the fibres to help increase the bond between the fibres and the cement matrix. These fibres are called mechanically modified fibre and chemically treated fibre and they are not commercially available. The expectation is that these fibres would be successful in eliminating cracks and reducing the strain induced by plastic shrinkage in cementitious materials. Hence, this study undertook both restrained and free plastic shrinkage tests on various fibre-reinforced composites made of these two engineered fibres. Furthermore, the effect of fibre type and fibre content on compressive strength was determined. The study found that these two engineered pulp fibres are highly effective in controlling both cracks and strains induced by plastic shrinkage.
Free and restrained plastic shrinkage of cementitious materials made of engineered kraft pulp fibres
https://orcid.org/0000-0001-5946-406X
https://orcid.org/0000-0002-2752-7019
https://orcid.org/0000-0002-4262-9398
Highlights Engineered pulp fiber reinforced cementitious materials were tested for restrained and free plastic shrinkage. Engineered fibres are either mechanically modified or chemically treated. Both crack width and crack area reduced when fiber amount increased. Mechanically modified fibre was the most effective one in eliminating the surface cracks. Compressive strength of the reinforced cementitious materials reduced when kraft pulp is added.
Abstract Early age cracks caused by plastic shrinkage of cementitious materials is a major problem in concrete structures. These cracks allow ingress of water, chlorides, and other deleterious materials and minerals into the material, causing early deterioration and damage to structures. Recently, two low-cost special Kraft pulp fibres have been designed and developed for reinforcement in cementitious materials. These fibres have never been used in any previous cementitious materials. Softwood fibres are engineered by extreme refinement followed by specific modification to produce these two special fibres. The modifications are done to create numerous tiny fibrils on the surface of the fibres to help increase the bond between the fibres and the cement matrix. These fibres are called mechanically modified fibre and chemically treated fibre and they are not commercially available. The expectation is that these fibres would be successful in eliminating cracks and reducing the strain induced by plastic shrinkage in cementitious materials. Hence, this study undertook both restrained and free plastic shrinkage tests on various fibre-reinforced composites made of these two engineered fibres. Furthermore, the effect of fibre type and fibre content on compressive strength was determined. The study found that these two engineered pulp fibres are highly effective in controlling both cracks and strains induced by plastic shrinkage.
Free and restrained plastic shrinkage of cementitious materials made of engineered kraft pulp fibres
Booya, Emad (author) / Gorospe, Karla (author) / Ghaednia, Hossein (author) / Das, Sreekanta (author)
Construction and Building Materials ; 212 ; 236-246
2019-03-25
11 pages
Article (Journal)
Electronic Resource
English
Proposed restrained plastic shrinkage test for cementitious materials
| British Library Conference Proceedings | 2005
Influence of basalt fibres on free and restrained plastic shrinkage
| Online Contents | 2016
Influence of basalt fibres on free and restrained plastic shrinkage
| Elsevier | 2016