Fibers for Permeability North Tonawanda 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.
1109 Military Road
Woodcraft - Buffalo, NY
1900 Ridge Road
West Seneca, NY
1659 Niagara Falls Boulevard
Hectors Hardware Clinton, Inc.
1955 Clinton Street
Island True Value Hdwe.
1889 Whitehaven Rd
Grand Island, NY
Advantage Trim & Lumber Co
601 Ohio St
Rockler Woodworking and Hardware #11
5085 Transit Rd
Spalding Ace Hardware
215 Davison Rd
Hectors Hardware Of Depew
6231 Transit Road
Hectors Hardware & Paint Co
2455 Niagara Falls Blvd.
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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