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About Integral Waterproofing

  • What is Integral Waterproofing?
  • Types of Integral Waterproofing
    • Hydrophobic Admixtures
    • Densifiers
  • Applications for Integral Waterproofing
  • How to Compare Integral Waterproofing Products

What is Integral Waterproofing?

Integral waterproofing goes INSIDE the concrete. Membrane waterproofing has a number of issues. It can be expensive, time-consuming, and easy to damage. Most membranes are made using oil-based materials and are not sustainable. If they leak, it’s not obvious who caused the problem and there can be a lot of finger-pointing. See risk reduction to learn more about the benefits of integral waterproofing over membrane waterproofing.

about-int-waterp-1Membranes are easily damaged. about-int-waterp-2Integral waterproofing is inside the concrete and protected by it.

Download the Concrete Durability White Paper

Integral waterproofing can be a far better solution than membranes for a number of reasons:

  • Faster construction
  • Reduced cost
  • Reduced risk with a performance warranty
  • Greener construction
  • Simple details

Integral waterproofing solutions all work by blocking water from being able to get into concrete, which is usually a water-loving material that sucks up moisture. Not all integral waterproofing solutions are the same – waterproofing admixtures vary in terms of performance, health and safety, service, and warranty.

Types of Integral Waterproofing

Hydrophobic Admixtures

Hydrophobic admixtures absorb less than 1% of water, and give superior performance compared with densifying admixtures. They considerably reduce the amount of water absorbed by dry concrete, and also protect against further water ingress when concrete is wet. They also protect against water ingress from hydrostatic pressure.

Water-Based Hydrophobic Permeability Reducing and Pore Blocking Admixture

Hycrete admixtures work by forming barriers in the concrete matrix, which stop water from getting in through capillaries. They also coat reinforcing steel, protecting against corrosion. For more information, see How Hycrete admixtures work.

about-int-waterp-3

  • Water-based
  • Low dosage required – 1-2 gallons per cubic yard
  • Cradle to Cradle Certified
  • May be used in conjunction with fly ash and slag
  • Service and warranty with Hycrete System W
  • Directly protects against corrosion

 

Ammonia Emulsion Admixture – Caltite

These hydrophobic admixtures consist of tiny “rubber balls” held in suspension in an ammonia solution. The rubber balls block the capillaries in the concrete, reducing the potential to absorb water.

about-int-waterp-4

  • Ammonia-based
  • High dosage required – 6 gallons per cubic yard
  • Service and warranty provided by manufacturer
  • Does not directly protect against corrosion

Densifiers

Densifiers may reduce the permeability of concrete. They tend to work best in situations where the concrete is permanently saturated, and less well where drying and rewetting may occur.

Supplementary Cementitious Materials

Fly ash, slag, and silica fume are industrial by-products: Fly ash comes from electricity production using coal as a fuel; slag is a by-product of steel manufacture; and silica fume comes from silicon manufacture. They are all ground very fine, and when they are used in concrete mixes they fill in gaps in the concrete structure to reduce permeability.

 

about-int-waterp-5Fly ash – from electricity production using coal about-int-waterp-6Slag – from steel manufacture about-int-waterp-7Silica fume – from silicon manufacture
  • May be used with other densifiers and hydrophobic admixtures
  • Generic, non-branded materials, readily available
  • Reduce permeability
  • Will not (on their own) provide a waterproof structure
  • No warranty or service
  • Do not directly protect against corrosion

 

Treated Silicates – “Crystal Growth”

Crystalline waterproofing admixtures are composed of cement, treated silicates, and other unidentified chemicals. These are generally already basic components of concrete, and work to “densify” concrete by reducing pore size. They work by forming crystals within the concrete capillaries – these could be compared to a beaver dam made out of sticks but no mud – limited effectiveness. In fact, it is possible that they may increase the absorption of water because of capillary action in the narrower holes. Imagine sucking water up through a straw – it takes a lot less pressure and effort to suck water through a thin straw than through a thick straw. For this reason, concrete with crystalline admixtures may have higher absorption than control concrete. Manufacturers include Xypex, Kryton, Ipanex, Penetron and Aquafin.

hycrete-other-comparison

 

Applications for Integral Waterproofing

Like all products, integral waterproofing is more suited to certain applications.

hycrete-other-comparison2

 

How to Compare and Select Integral Waterproofing Products

When comparing integral waterproofing products, here are some questions to ask:

how-to-compare

Concrete Durability – Understanding Water Transport Mechanisms in Concrete
Please contact us with any questions you have about integral waterproofing.

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