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.
190 West St. Section 1B Brooklyn, NY, 11222
224 Selleck Street Stamford, CT, 06902
399 8th Avenue
New York, NY
Auburndale Mason Supply
40-02 Francis Lewis Blvd
The Home Depot
111 Jericho Turnpike
BRUCKNER LUMBER & BUILDING SUPPLY
259 Bruckner Blvd Bronx, NY, 10454
LOWE'S OF ORANGEBURG, NY
206 ROUTE 303 ORANGEBURG, NY, 10962
Keoughs Paint & Hardware
907 High Ridge Rd
Best Hardware & Mill Supplies
406 Jericho Turnpike
Floral Park, NY
Tonys Hardware & Tool Rental
12414 Liberty Ave
S Richmond Hill, 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