Fibers for Permeability Astoria 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.
Costello's Ace Hardware
2323 Jericho Turnpike, In Pathmark Shopping Center/Near Charlie Brown's
Garden City Park, NY
Ace Hardware of Rockville Centre
315 Sunrise Hwy, between Morris and N.Park
Rockville Centre, NY
Morales Department Store
1862 Jerome Ave
Kings Material Company Inc.
3707 15th Avenue
Kmart 9416 / Cross Merch
399 Tarrytown Rd
White Plains, NY
607 18th Street
700 Dibblee Drive
Garden City, NY
Dick's Do it Best Hardware
9 Gold Street
New York, NY
Great Neck Hardware
135 Cuttermill Rd
Great Neck, NY
6119 7th Avenue
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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