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.


Select a Tech Note below:

1. A new European Assessment Document (EAD) confirms that Xypex is the first and only concrete waterproofing admixture approved in the European Union.

The European Organization for Technical Assessment (EOTA) created a new standard for waterproofing admixtures. This European Assessment Document (EAD), titled “Waterproofing Admixture for Concrete, draws a new distinct line between water-resisting admixtures and waterproofing admixtures. Now, Xypex is the first and only company in the EU approved to label its products “waterproofing admixtures for concrete,” citing EAD 260026-00-0301 as verification.

2. 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.

3. 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 floats in Gunnamatta Bay near Sydney, Australia.

4. 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. 

5. 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. 

6. 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 0.5 mm (0.02 in).

7. 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 waterproofing admixtures, titled Permeability Reducing Admixtures or PRAs.

8. 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.

9. 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 benefit, coupled with the fact that the Xypex concrete waterproofing 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.

10. 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.

11. 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.

12. 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.

13. 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.

14. Xypex for Waterproofing Suspended Slab Concrete 
Xypex has been used in many horizontal suspended concrete applications (suspended slabs). While flexible membranes for waterproofing suspended slabs are commonly used, their characteristics limit performance – drawbacks that the Xypex solution overcomes.

15. FCM 80 for Rehabilitation of Areas with Low to Medium Pedestrian Traffic 

The Riverside WTP rehabilitation project commenced in late 2015. The basic scope of work included the repair and resurfacing of the interior and exterior walls of the sedimentation basins, filters and flocculation basins. In addition, Xypex Concentrate and Xypex FCM 80 were used to coat the top surfaces of the non-air entrained concrete walkways and beams. Xypex was chosen to protect these horizontal elements from water ingress, chemical exposure and potential freeze thaw damage.

16. Xypex Injection Techniques 
A Xypex modified grout injection technique for repair of poorly consolidated concrete (honeycomb) and wide cracks or voids in concrete elements has been proven effective through several years of field experience in India and other markets around the world. The process entails injection of a Xypex rich grout mix into the deficient areas essentially inserting a Portland cement / Xypex chemistry blend into areas where poor consolidation, large crack, “loose” joints, etc. have left a cement paste deficient area within the hardened concrete structure.


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