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.
Roberts Plywood Co.
45 North Industry Court
Deer Park, NY
DYNAMITE TOOL CO
1551 SMITHTOWN AVENUE BOHEMIA, NY, 11716
LOWE'S OF MEDFORD, NY
2796 ROUTE 112 MEDFORD, NY, 11763
Agnew & Taylor True Value
501 Hawkins Ave
Lake Ronkonkoma, NY
Lake Ronkonkoma-Sears Hardware Stores
585 Portion Rd
Lk Ronkonkoma, NY
EXOTIC WOODS USA
698 Fort Salonga Rd
16 Railroad St
Huntington Station, NY
61 D Carolyn Blvd Farmingdale, NY, 11735
SUNRISE TOOL SERVICE
124 SUNRISE HIGHWAY WEST ISLIP, NY, 11795
West Islip, NY
Brinkmann True Value Hdwe
15 Foster Ave
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.
Click here to read full article from The Concrete Producer