Effect of steel fiber on the crack permeability evolution and crack surface topography of concrete subjected to freeze-thaw damage

This paper describes the steel fiber effect on the crack permeability and crack surface topography of concrete subjected to freeze-thaw damage. The sequential crack permeability of steel fiber reinforced concrete are investigated by a vacuum permeability set-up. The topographical analysis is applied...

Full description

Saved in:

Bibliographic Details
Published in:	Cement and concrete research 2020-12, Vol.138, p.106230, Article 106230
Main Authors:	Zeng, Wei, Ding, Yining, Zhang, Yulin, Dehn, Frank
Format:	Article
Language:	eng
Subjects:	Concrete Crack permeability Crack surface topography Damage Exponential functions Freeze-thaw damage Freeze-thaw durability Laminar flow Permeability Reinforced concrete Reinforcing steels Roughness Steel fiber Steel fiber reinforced concretes Steel fibers Topography
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	This paper describes the steel fiber effect on the crack permeability and crack surface topography of concrete subjected to freeze-thaw damage. The sequential crack permeability of steel fiber reinforced concrete are investigated by a vacuum permeability set-up. The topographical analysis is applied on the crack surface by an invented 3-D laser scanning equipment. The results show that the crack permeability of concrete is less than the value predicted by the Poiseuille flow model and their difference decreases gradually with the crack widening. With increment of steel fiber dosage and freeze-thaw damage level, the effect of steel fiber on reducing the crack permeability becomes strong. Topographical analysis illustrates that both steel fiber and freeze-thaw damage enhance the roughness of concrete crack surface. The relationship between roughness number of crack surface and material permeability parameter α follows an exponential function, which can be employed to quickly estimate the crack permeability of concrete. •Steel fiber and freeze-thaw damage enhance the roughness of concrete crack surface and reduce the crack permeability.•The difference between crack permeability of concrete and Poiseuille flow model decreases with crack widening.•The vacuum permeability set-up are successfully applied to evaluate the sequential crack permeability.•The relationship between roughness of crack surface and crack permeability is suggested for durability evaluation of SFRC.
ISSN:	0008-8846 1873-3948