Category:Ferrocement

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  • Ferrocrete
  • Concrete
  • Cement

Links

Project Ideas

  • Concrete Patio Furniture using Silicone Molds for Flat Castings
    • Similar to PlayaTech plywood flatpack furniture
    • Maybe not great because two-sided molds for concrete sound challenging
    • Maybe make a tabletop, bench seat, or bench back, where one side is unseen
  • Cylinder Fountain

Fountain-examples-med.jpg 3 cylinder fountain.jpg

Formulations

Ratios

  • Dryer mix is stronger, too wet leaves voids when the water evaporates.
    • Plasticizers act like water, but don't evaporate.
  • Aggregate:Portland
    • 1:1 super strong, super expensive
    • 10:1 super weak, super cheap (super light, if using vermiculite or perlite)
    • 2:1 / 3:1: normal

Ingredients

  • Portland Cement
    • S-Type 1/2: Uses lime, weighs 78 pounds per bag, more sticky, less compressive strength.
    • Standard: 96 pounds per bag, less sticky, more compressive strength.
    • Or use standard and add lime (3 portland : 1 lime by volume)
  • Pumice, Vermiculite, Perlite
    • Light Weight Aggregate

GPT

Ferrocement is a type of thin reinforced concrete made with a closely spaced, multiple layers of wire mesh or fine rods, which is then impregnated with a cement-sand mortar. In addition to cement and sand, several additives can be used in ferrocement to enhance its properties. Here are some common additives, their purposes, and typical quantities:

  1. Water:
    • Purpose: Essential for the hydration of cement and to create the paste that binds the aggregates.
    • Quantity: Water-cement ratio typically ranges from 0.4 to 0.6 by weight.
  2. Admixtures:
    • Types and Purposes:
      • Plasticizers (Water-reducing agents): Improve workability without adding more water. Typical dosage is 0.1% to 0.4% of cement weight.
      • Superplasticizers (High-range water reducers): Allow for significant reductions in water content, improving strength and durability. Dosage can range from 0.5% to 3% of cement weight.
      • Retarders: Slow down the setting time of the cement, useful in hot climates or for complex shapes. Dosage usually around 0.2% to 0.6% of cement weight.
      • Accelerators: Speed up the setting and hardening process, useful in cold climates. Dosage varies, often around 1% to 2% of cement weight.
      • Air-entraining agents: Introduce tiny air bubbles to improve freeze-thaw resistance. Typically used at 0.05% to 0.2% of cement weight.
  3. Fibers:
    • Purpose: Improve tensile strength, crack resistance, and overall durability.
    • Types and Quantities:
      • Steel fibers: 0.5% to 2% by volume.
      • Glass fibers: 0.1% to 0.5% by volume.
      • Polypropylene fibers: 0.1% to 0.3% by volume.
  4. Pozzolans:
    • Purpose: Improve durability, reduce permeability, and enhance long-term strength.
    • Types and Quantities:
      • Fly ash: Can replace 15% to 30% of cement weight.
      • Silica fume: Used at 5% to 10% of cement weight.
      • Metakaolin: Typically used at 5% to 10% of cement weight.
  5. Silica Sand:
    • Purpose: Used as fine aggregate to improve the workability and finish of the mortar.
    • Quantity: Replaces a portion of the regular sand, often 10% to 30% by volume of the sand component.
  6. Lime:
    • Purpose: Improves workability and plasticity of the mortar.
    • Quantity: Typically used at 5% to 10% of the cement weight.
  7. Waterproofing Agents:
    • Purpose: Improve water resistance and reduce permeability.
    • Types and Quantities: Dosages vary widely depending on the specific product, usually around 1% to 2% of cement weight.

The exact quantities and combinations of these additives will depend on the specific requirements of the ferrocement application, including desired strength, workability, setting time, and durability.

Pages in category "Ferrocement"

The following 2 pages are in this category, out of 2 total.

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