Tech Note

Simplified expansion of Xypex's technical information focusing on a particular application issue and written in terms to be understood by the non-professional. The content may include diagrams for illustration purposes.

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Select a Tech Note below:

1) Corrosion Resistance of Xypex-Treated Concrete

While Xypex Admixtures and Coatings are recognized throughout the world as reliable treatments for the waterproofing and protection of both new and existing concrete structures, the ability of Xypex Crystalline Technology to improve reinforced concrete’s resistance to the damaging and very costly effects of various chemicals (specifically, chloride salts) is not as well known.

2) Xypex for Chloride Protection – A Case Study

Proof of Xypex permanence and its ability to enhance the durability of concrete structures was clearly evident in a recent review of the Xypex-treated precast concrete used to construct the Cronulla Marina oats in Gunnamatta Bay near Sydney, Australia.

3) Fast-Track Coating System

The Xypex concrete waterproofing procedure detailed below is intended for situations when there is too little time available to waterproof structures using normal Xypex coating application and curing procedures. Typical situations include structures taken out of service for planned or unplanned maintenance but where a return-to-service is required within days or even hours. 

4) Secant Pile Construction Waterproofing

Secant pile construction is a technique used to build underground walls without the need to rst excavate. It is a commonly used method for creating walls for tunnels and for deep U-shaped below grade guideways. Secant piles are also suitable for foundation wall construction in dense urban settings where excavation size is critical. 

5) Waterproofing of Periodically Moving Cracks and Joints Using Xypex Products

Xypex Crystalline Technology is excellent for reducing the water permeability of concrete and for the healing of leaking, non-moving cracks and joints in concrete structures. Xypex crystals will bridge most non-moving cracks up to 0.4 mm (1/64”).

6) ACI Examines Waterproofing Admixtures: Crystalline vs. Pore Blocking and Other Admixtures

Of interest to specifying engineers and architects is the new ACI 212.3R-10 Report on Chemical Admixtures for Concrete. This recently published guide has a substantially improved chapter on waterproo ng admixtures, titled Permeability Reducing Admixtures or PRAs.

7) Microbial Induced Corrosion (MIC) Attack of Concrete in Sewage Applications

It is well known that concrete often ages more quickly in sewage applications. Why does this occur and what can be done to minimize such deterioration? Both physical and chemical attack of concrete in sewage systems are possible.

8) Xypex "White"

Because the unique chemistry of Xypex’s Crystalline Technology works within the concrete itself, the application of the Xypex coating system to in-place and in-service facilities can be made from either the positive or negative side of the concrete structure. This bene t, coupled with the fact that the Xypex concrete waterproo ng system lasts the life of the concrete and requires no re-application or maintenance regardless of UV exposure and most other environmental effects, has made Xypex Crystalline Technology a reliable waterproo ng solution for users, worldwide.

9) Bonding Procedures

The steps needed to achieve a successful bonding of layers in a multiple-layer-system can be challenging and require the special attention of everyone involved, including specifying engineers, architects, builders and owners.

10) Xypex Patch'n Plug vs Other Cement Based Water Plug Products

Xypex Patch’n Plug is the most effective rapid-setting-hydraulic-mortar (RSHM) available in what is a very crowded world of competitive products. This opinion is largely based on the distinguishing Xypex crystallization effect that is integral to Xypex Patch’n Plug – a property that elevates the product beyond the normal effectiveness of this family of materials. This is further explained below.

11) Effects of Cold Weather on Xypex

Most methods for waterproofing concrete structures, including Xypex coatings and admixtures, are affected to some degree by cold temperatures. In fact, many coatings cannot be installed in cold temperatures. Elastomeric materials often lose their elongation capabilities as the temperature drops, and most crack-injection products react slowly and become too viscous to penetrate well, thus becoming ineffective.

12) Xypex Treatment of Pile Caps and Pile Supported Mat Slabs
Piles are a commonly used foundation for the support of structures. Groups of piles will often be combined into pile caps. The lowest level slab is cast on top of the pile caps to create a level uninterrupted surface. Load bearing columns typically align with the pile caps and either sit on the slab or extend through the slab onto the pile cap itself. The illustration below shows both of these assemblies.

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