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
LOWE'S OF NEWBURGH, NY
1239 ROUTE 300 NEWBURGH, NY, 12550
Buchanan Home Center, Inc
3119 Albany Post Rd
The Home Depot
1220 Route 300
Kmart 9462 / Cross Merch
374 Windsor Hwy Rte 32
Vails Gate, NY
ABC Supply Co.,Inc/Newburgh
150 S. Water Street Newburgh, NY, 12550
10 Federal Rd Danbury, CT, 06810
Ring's End Lumber/South Salem
Rte. 123 Smithfield Rd South Salem, NY, 10590
South Salem, NY
The Home Depot
114 Federal Road
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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