Fibers for Permeability New York 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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Mitchell Simon Co Inc
(201) 568-2108
15 S Dean St
Englewood, NJ
Haworth Hardware
201-384-8146
300 St Nicholas Ave
Haworth, NJ
Kings Material Company Inc.
718-438-5232
3707 15th Avenue
Brooklyn, NY
The Home Depot
(973)848-0600
399-443 Springfield Ave
Newark, NJ
Lake Success S/C
(516) 574-5500
1400 Union Tpke
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Monster Woodshop
888-506-6678
607 18th Street
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KASS INDUSTRIAL SUPPLY/Bronx
(718) 299-6060
1715 Washington Ave Bronx, NY, 10457
Bronx, NY
Great Neck Hardware
516-439-4399
135 Cuttermill Rd
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Decorama Bldg & Plb Supply Inc
718-651-1800
1233 Metropolitan Ave
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The Home Depot
(212)929-9571
40 West 23rd Street
New York, NY
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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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