Fibers for Permeability Bellmore 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.
Roberts Plywood Co.
45 North Industry Court
Deer Park, NY
315-B Roslyn Road Mineola, NY, 11501
144-17 Hardware, Inc.
14417 243rd St
The Home Depot
475 Commack Road
Deer Park, NY
Huntington Sq Mall
4000 Jericho Tpke
E Northport, NY
EXOTIC WOODS USA
698 Fort Salonga Rd
16 Railroad St
Huntington Station, NY
57-08 37th Avenue Woodside, NY, 11377
Best Hardware & Mill Supplies
406 Jericho Turnpike
Floral Park, NY
N Babylon/Deer Pk - Sears Hardware Stores
20 Deer Shore Sq
North Babylon, NY
Data Provided by:
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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