Hydrophobic Products

For years, there has been much debate over which product will provide the best waterproofing of concrete and concrete structures.

The American Concrete Institute (ACI) recently finished a report on Permeability-Reducing Admixtures ("PRAs" - ACI 212.3R-10).

This report splits admixtures into two subcategorizes: PRAs for concrete which is not exposed to hydrostatic conditions (PRAN), and PRAs for concrete which is exposed to hydrostatic conditions (PRAH).

ACI's finding is that hydrophobic (PRAN) admixtures are only good for damp-proofing, not waterproofing of water-retaining structures. To waterproof water-retaining structures, below grade structures, tunnels, bridges, dams and aquatic centers you need to use a PRAH, or crystalline, product. Xypex is the leader in the PRAH category.

Hydrophobic pore blockers are only PRAN-type protection and are good for rain water repelling, improving the quality of pavers and blocks, and helping reduce efflorescence.

In section 15.2 of the report, ACI also explains how hydrophobic pore blockers do not bridge cracks, and that crystalline products do.

For a copy of that section of the ACI report, follow this link: ACI 212.3R-10, Chapter 15.


Independent testing results for PRAH-type product Xypex C-Series Admixture


Performance Standard
Product

Permeability
Resistance
Compressive
Strength
Crack
Sealing
Chemical
Resistance
Set
Time
De-icer
Resistance
Moisture Vapor
Emission Rate
Electrical
Conductance
Xypex
C-Series
Admixture
(PRAH-type
product)

Performance 100% reduction against 460' water head (200 psi). Approx. 15% increase against control. Seals cracks up to 0.4mm Improved resistance against: 5-7% sulphuric acid, ammonium sulphate, acetone, chloride penetration and other chemicals. No impact with C-500.
Set retardation available with C-1000 and C-2000.
Substantial improvement in freeze-thaw durability. 36% reduction in water vapor transmission. 30% reduction in coulomb rating.

Test DIN 1048 & others ASTM C 39
ASTM C 267
ASTM C 672 BBA Certificate 05/4216 - Test BS 3177 ASTM C1202 (modified)

Additional
Info
11 independent tests available for review.
Control leaked through 120mm samples - 4% Xypex-treated samples had 0mm of water penetration.
9 independent tests available for review. 1 independent test available for review. 9 independent tests available for review.
2 independent tests available for review. 1 independent test available for review. This result based on testing by University of New South Wales using a modified ASTM C 1202.

Contact us for additional information and testing data.