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.
115 Old Route 9 Fishkill, NY, 12524
LOWE'S OF POUGHKEEPSIE, N. Y.
GALLERIA MALL 790 SOUTH RD POUGHKEEPSIE, NY, 12601
Buchanan Home Center, Inc
3119 Albany Post Rd
Scotts Corners Hardware
1037 State Route 17K
Jefferson Valley Mall
600 Lee Blvd
Yorktown Hts, NY
1239 Route 300
35 Patrick Lane Noxon BussPark Poughkeepsie, NY, 12603
247 MAHOPAC AVENUE YORKTOWN HEIGHTS, NY, 10598
Yorktown Heights, NY
B. Rose Hardware
313 Main Street
Highland Falls, NY
Webers Hardware & Paint
22 Wallkill Ave
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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