Fibers for Permeability Bayside 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.
S & E Building Matls Co
744 Mcdonald Ave, between Ditmas Ave and Cortelyou Rd.
Herman's Has Everything
1070 Linwood Street Brooklyn, NY, 11208
94 Kraft Ave
Canarsie Lumber, Inc
826 Rockaway Parkway
Kmart 9416 / Cross Merch
399 Tarrytown Rd
White Plains, NY
607 18th Street
73 Bloomingdale Rd Hicksville, NY, 11801
321 Queen Anne Road
Modern Paint & Hardware Corp
316 Huguenot St
New Rochelle, NY
The Home Depot
131-35 Avery Avenue
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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