Fibers for Permeability Cambria Heights 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.
8111 5th Ave
700 Dibblee Drive
Garden City, NY
KASS INDUSTRIAL SUPPLY/Bronx
1715 Washington Ave Bronx, NY, 10457
Idlewild Do it Best Hardware
157-17 Rockaway Blvd
The Home Depot
980 3rd Ave
New York, NY
607 18th Street
BRUCKNER LUMBER & BUILDING SUPPLY
259 Bruckner Blvd Bronx, NY, 10454
190 West St. Section 1B Brooklyn, NY, 11222
Canarsie Lumber, Inc
826 Rockaway Parkway
The Home Depot
2970 Cropsey 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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