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.
Costello's Ace Hardware
2323 Jericho Turnpike, In Pathmark Shopping Center/Near Charlie Brown's
Garden City Park, NY
73 Bloomingdale Rd Hicksville, NY, 11801
LOWE'S OF GARDEN CITY, NY
700 DIBBLEE DRIVE GARDEN CITY, NY, 11530
Garden City, NY
206 Pegasus Ave
Great Neck Hardware
135 Cuttermill Rd
Great Neck, NY
607 18th Street
15 East Union Avenue East Rutherford, NJ, 07073
East Rutherford, NJ
330 Fairfield Avenue Stamford, CT, 06902
MORGAN TOOL RENTALS INC
500 MORGAN AVENUE BROOKLYN, NY, 11222
Montvale Hardware & Supply Co
8 Railroad Avenue
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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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