Fibers for Permeability Mahopac 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.
12B White St Buchanan, NY, 10511
RIDGEFIELD SUPPLY CO
29 PROSPECT STREET RIDGEFIELD, CT, 06877
Buchanan Home Center, Inc
3119 Albany Post Rd
The Home Depot
1570 Route 9
Wappingers Falls, NY
Kmart 9414 / Cross Merch
Rte 118 355 Downing
Yorktown Hts, NY
Williams Lumber Inc
908 Route 82
Hopewell Junction, NY
LOWE'S OF NEWBURGH, NY
1239 ROUTE 300 NEWBURGH, NY, 12550
Keough's Paint & Hardware
1 Ethan Allen Highway
2 Johnes Street
Jefferson Valley Mall
600 Lee Blvd
Yorktown Hts, 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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