Fibers for Permeability Hopewell Junction 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.

Local Companies

Williams Lumber Inc
(845) 221-2751
908 Route 82
Hopewell Junction, NY
Fastenal- Fishkill
845-897-4721
115 Old Route 9 Fishkill, NY, 12524
Fishkill, NY
Ring's End Lumber/New Milford
(860) 355-5566
Rte 7 140 Danbury Road New Milford, CT, 06776
New Milford, CT
The Home Depot
(845)561-6540
1220 Route 300
Newburgh, NY
Kmart 3372 / Cross Merch
(845) 297-1246
1895 South Road
Poughkeepsie, NY
Williams Lumber Inc
(845) 698-1004
4246 Albany Post Rd
Hyde Park, NY
Lowe's
(845) 834-5000
650 Route 299
Highland, NY
Lowe's of Lloyd
845-834-5000
650 Route 299 Highland, NY, 12528
Highland, NY
The Home Depot
(860)350-0304
104 Danbury Road
New Milford, CT
The Home Depot
(845)279-9669
80 Independence Way SE
Brewster, 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.

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