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Cracking behaviour of steel microfibers reinforced cement pastes
This paper reports the results of an experimental study aiming to assess the influence of steel microfibres on the cracking behaviour of cement pastes subjected to an imposed tensile strain. Mixtures were made using two different size of fibres (80 micrometer x 2 mm and 60 micrometer x 3 mm) made of mild steel and used at different fraction volumes up to 8 %. A test set-up was developed in order to subject the tested specimens (85 x 15 x 600 mm) to a uniform tensile strain all along their length. The characteristics of the crack pattern was measured and recorded up to a 2000 micrometer/m tensile strain value. The results obtained show that the aspect ratio of fibres (L/d) is a key factor as regards with their ability to prevent, delay, or control cracking. Slender fibres are, clearly, much more efficient with this regard. The efficiency of microfibres also increases with the fibre content up to a critical value which is equal to 2 % in volume, for 80 micrometer x 2 mm fibres (L/d = 25), or 6 % in volume, for 60 micrometer x 3 mm fibres (L/d = 50). It can be concluded that it is possible to produce a micro-reinforced cementitious composite having a good cracking behaviour by using only a limited amount of steel microfibres, provided that those fibres have a high aspect ratio. Mechanisms are also proposed in order to explain the results obtained.
Cracking behaviour of steel microfibers reinforced cement pastes
This paper reports the results of an experimental study aiming to assess the influence of steel microfibres on the cracking behaviour of cement pastes subjected to an imposed tensile strain. Mixtures were made using two different size of fibres (80 micrometer x 2 mm and 60 micrometer x 3 mm) made of mild steel and used at different fraction volumes up to 8 %. A test set-up was developed in order to subject the tested specimens (85 x 15 x 600 mm) to a uniform tensile strain all along their length. The characteristics of the crack pattern was measured and recorded up to a 2000 micrometer/m tensile strain value. The results obtained show that the aspect ratio of fibres (L/d) is a key factor as regards with their ability to prevent, delay, or control cracking. Slender fibres are, clearly, much more efficient with this regard. The efficiency of microfibres also increases with the fibre content up to a critical value which is equal to 2 % in volume, for 80 micrometer x 2 mm fibres (L/d = 25), or 6 % in volume, for 60 micrometer x 3 mm fibres (L/d = 50). It can be concluded that it is possible to produce a micro-reinforced cementitious composite having a good cracking behaviour by using only a limited amount of steel microfibres, provided that those fibres have a high aspect ratio. Mechanisms are also proposed in order to explain the results obtained.
Cracking behaviour of steel microfibers reinforced cement pastes
Rißverhalten von stahlmikrofaser-verstärkten Zementpasten
Shink, M. (author) / Pleau, R. (author) / Pigeon, M. (author) / Gagne, R. (author)
2000
10 Seiten, 7 Bilder, 2 Tabellen, 3 Quellen
Conference paper
English
Cracking behaviour of steel microfibres reinforced cement pastes
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