Fibers for Permeability Beacon 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.

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Lowe's
(845) 834-5000
650 Route 299
Highland, NY
Fastenal-Poughkeepsie
845-486-8828
35 Patrick Lane Noxon BussPark Poughkeepsie, NY, 12603
Poughkeepsie, NY
TOOL NUT
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247 MAHOPAC AVENUE YORKTOWN HEIGHTS, NY, 10598
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The Home Depot
(845)561-6540
1220 Route 300
Newburgh, NY
Kmart 9462 / Cross Merch
(845) 561-2334
374 Windsor Hwy Rte 32
Vails Gate, NY
Lowe's
(845) 572-2400
3924 Summerville Way
Chester, NY
Lowe's
(845) 567-2860
1239 Route 300
Newburgh, NY
Lowe's of Chester
845-572-2400
3924 Summerville Way Chester, NY, 10918
Chester, NY
The Home Depot
(845)896-0824
450 State Route 9
Fishkill, NY
Jefferson Valley Mall
(914) 248-2500
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.

Click here to read full article from The Concrete Producer

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