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.
2381 Route 9 Bldg 2 Suite 4 Mechanicville, NY, 12118
LOWE'S OF HALFMOON, NY
476 ROUTE 146 HALFMOON, NY, 12065
Burnt Hills Hardware & Supply Co
217 Kingsley Rd
Burnt Hills, NY
The Home Depot
4 Halfmoon Crossing Blvd
Clifton Park - D
15 Park Ave
Clifton Park, NY
Noble Ace Hardware
80 William St, Hannaford on Rte. 9
South Glens Falls, NY
GUNS & HOSES
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Hudson Falls, NY
LOWE'S OF SARATOGA SPRINGS, NY
10 LOWE'S DRIVE SARATOGA SPRINGS, NY, 12866
Saratoga Springs, NY
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93 Freemans Bridge Road
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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