Fibers for Permeability Suffern 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.
Palmer Ace Hardware
940 Kinderkamack Rd, Charlie Browns Restaurant in Oradell
River Edge, NJ
68A Clinton Rd Fairfield, NJ, 07004
Pomona Do it Best Hardware
1581 Route 202
The Home Depot
106 Route 23 North
Jefferson Valley Mall
600 Lee Blvd
Yorktown Hts, NY
BOARDS & BEAMS, CO.
48 OLD JACKSONVILLE ROAD
Closure Systems, Inc.- Hackensack
277 Lodi Street Hackensack, NJ, 07601
Herb Lack Paints & Hardware
124 Main Street
88 Orange Turnpike
Cross County S/C
Rte 87(Ny St) & Cross Ct Pkwy
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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