Fibers for Permeability Depew NY
Permeability is defined as the property that governs the rate of fluid flow through a porous solid (Ref. 1). The porosity of cement paste determines the permeability of concrete (Ref. 2). The water-cement ratio is one of the largest contributors to porosity development, but, on the whole, porosity is determined through chemical interaction.
Certainly Wood, Inc.
13000 Route 78
East Aurora, NY
1109 Military Road
Woodcraft - Buffalo, NY
1900 Ridge Road
West Seneca, NY
Philipps Bros. Supply
2525 Kensington Ave Amherst, NY, 14226
Summit Park Mall
6929 Williams Rd
Niagara Falls, NY
Advantage Trim & Lumber Co
601 Ohio St
Niagara Lumber and Wood Products, Inc.
47 Elm Street
East Aurora,, NY
Rockler Woodworking and Hardware #11
5085 Transit Rd
5901 S. Transit Rd Lockport, NY, 14094
Valu Home Center #22
Grey St & Big Tree Rd
East Aurora, NY
Data Provided by:
Source: THE CONCRETE PRODUCER/CONCRETE JOURNAL MAGAZINE
Publication date: March 1, 2001
Question: A customer has asked us to include fibers in the mix design for a water retention tank. The idea is that the fibers will reduce the permeability of the concrete. Is that true?
Answer: There are really two responses here. The first defines permeability, and the second determines how fibers affect permeability.
Permeability is defined as the property that governs the rate of fluid flow through a porous solid (Ref. 1). The porosity of cement paste determines the permeability of concrete (Ref. 2). The water-cement ratio is one of the largest contributors to porosity development, but, on the whole, porosity is determined through chemical interaction. Since the fibers themselves are chemically inert and have no interaction with cementitious reactions, it is not possible for the fibers to decrease the permeability of concrete.
However, this is not to say that fluid will not flow through the concrete at a different rate when fibers are present. In a simple sense, fibers are small, flexible aggregates. As such, they create a small matrix of aggregates within the larger concrete matrix. If moisture flows through concrete via the cement paste, then the fibers create a more tortuous path. The more tortuous the path, the longer it takes the water takes to traverse it.
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