Fibers for Permeability Cortland 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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Fastenal- Ithaca
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229 Cherry St Ithaca, NY, 14850
Ithaca, NY
Builders Best Do it center
607-756-7871
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Cortland, NY
Alpine Building Supply
315-497-1221
Route 38
Moravia, NY
La Fayette True Value Hdwe
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La Fayette, NY
Cortland - D
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854 State Rte 13
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Lowe's
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Ithaca, NY
Cincinnatus Home Center
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Valu Home Center #43
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1122 Rt 222
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Tully Do it Best Bldg Supply
315-696-8984
24 Onondaga Street
Tully, NY
Moravia True Value Hardware
(315) 497-1966
102 Main St
Moravia, NY

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.

Click here to read full article from The Concrete Producer

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