Fibers for Permeability Buffalo 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.

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Certainly Wood, Inc.
716-655-0206
13000 Route 78
East Aurora, NY
RC Tonewoods
716-873-6043
1109 Military Road
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Woodcraft - Buffalo, NY
(716) 674-0795
1900 Ridge Road
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The Home Depot
(716)871-8800
2100 Elmwood Avenue
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Lockport - Sears Hardware Stores
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5847 S Transit Rd
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Advantage Trim & Lumber Co
716-827-3915
601 Ohio St
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Niagara Lumber and Wood Products, Inc.
716-655-2142
47 Elm Street
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Rockler Woodworking and Hardware #11
(716) 631-8922
5085 Transit Rd
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Wagners Agway
716-937-9301
2206 Sandridge Rd
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Lowe's
(716) 677-1500
3195 Southwestern Boulevard
Orchard Park, 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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