Fibers for Permeability Camillus 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.
5701 East Circle Drive
3856 State Route 31 Liverpool, NY, 13090
Elbridge Ace Hardware
237 E Main St, Big M Plaza
P-b Hardware, Inc.
143 Main Street
Port Byron, NY
Kmart 4034 / Cross Merch
2803 Brewerton Rd
Village Ace Hardware
2701 Erie Dr
366 W. 1st St South Fulton, NY, 13069
LOWE'S OF AUBURN, N. Y.
299 GRANT AVE. AUBURN, NY, 13021
Manlius True Value Hardware
8225 Cazenovia Rd
Bobs True Value Hardware
4805 S Salina St
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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