Fibers for Permeability Wappingers Falls 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

Lowe's
(845) 834-5000
650 Route 299
Highland, NY
Fastenal- Fishkill
845-897-4721
115 Old Route 9 Fishkill, NY, 12524
Fishkill, NY
LOWE'S OF POUGHKEEPSIE, N. Y.
845 298-4720
GALLERIA MALL 790 SOUTH RD POUGHKEEPSIE, NY, 12601
Poughkeepsie, NY
The Home Depot
(845)485-0420
3470 North Road
Poughkeepsie, NY
Lowe's
(845) 298-4720
1941 South Road
Poughkeepsie, NY
Williams Lumber Inc
(845) 221-2751
908 Route 82
Hopewell Junction, NY
ABC Supply Co.,Inc/Newburgh
845-561-5565
150 S. Water Street Newburgh, NY, 12550
Newburgh, NY
LOWE'S OF NEWBURGH, NY
845 567-2860
1239 ROUTE 300 NEWBURGH, NY, 12550
Newburgh, NY
Webers Hardware & Paint
845-895-2781
22 Wallkill Ave
Wallkill, NY
The Home Depot
(845)298-9200
1570 Route 9
Wappingers Falls, 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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