Fibers for Permeability Beacon 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

J & R TOOL CO
(845) 279-6169
3651 DANBURY RD, RTE 6 BREWSTER, NY, 10509
Brewster, NY
LOWE'S OF POUGHKEEPSIE, N. Y.
845 298-4720
GALLERIA MALL 790 SOUTH RD POUGHKEEPSIE, NY, 12601
Poughkeepsie, NY
Webers Hardware & Paint
845-895-2781
22 Wallkill Ave
Wallkill, NY
Lowe's
(845) 298-4720
1941 South Road
Poughkeepsie, NY
Poughkeepsie - D
(845) 471-9300
635 Dutchess Turnpike
Poughkeepsie, NY
Lowe's
(845) 572-2400
3924 Summerville Way
Chester, NY
Lowe's of Lloyd
845-834-5000
650 Route 299 Highland, NY, 12528
Highland, NY
Rim Supply
845-565-5220
2 Johnes Street
Newburgh, NY
The Home Depot
(914)528-1539
3131 E Main St
Mohegan Lake, NY
Poughkeepsie Galleria
(845) 298-3700
2001 South Rd
Poughkeepsie, 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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