Technologies used for Active and Static Waterbars.

Technologies

All Manorteq waterbars, FormPlugs and FormRings are waterproof. However not all of Manorteq’s waterbars use the same technology. The differing waterbar technologies available enable you to supply a bespoke solution for your project. The choices are also not just about whether the waterbars are Active or Static; there are the various different Active options to consider, understanding the benefits these can bring to the project in question.

Active Waterbars

Bentonite

Bentonite is a naturally absorbent clay. Of the two types of bentonite clay, it is sodium bentonite that has the natural ability to absorb large quantities of water which can increase its volume by up to a factor of eight. It is this property that makes it an excellent joint sealing material within concrete as it provides a self-sealing, low permeability barrier.

When mixed with butyl rubber, the clay takes on the ability to hold its form and slow the process of washout. The butyl rubber aids the holding of the form once swollen. However, during continuous wet and dry cycles*, the active waterbar will reduce in size during the dry cycle (though not to its original size), and then swell again when water is reintroduced.

* Often, when wet / dry cycles are referenced, it refers to laboratory condition tests where material is thoroughly wetted and then completely dried. In the ‘real world’ this is highly unlikely to occur unless very long periods of hot, dry weather are experienced between rain.

Synthetic Rubber

Synthetic rubbers are a mix of polymers (normally a combination of a plastic and a rubber) that contain thermoplastic and elastomeric properties.

Synthetic rubbers show advantages typical of both plastic and rubber-based materials. The benefit of using synthetic rubber is its

ability to elongate and return to its near original shape thus creating a more durable and versatile material.

The combination of this technology with hydrophilic elements, gives the ability to create products with differing swelling properties.

Material Comparison

The big differences between synthetic rubber and sodium bentonite are:

 Bentonite / Clay Mix Synthetic Rubber
Sealing Force / ExpansionAt a size of 20 mm × 25 mm the sealing force is up to 1.25 tonne per metreAt a size of 20 mm × 5 mm the sealing force is greater than 2.60 tonne per metre
Wet / dry cycles

The mix is the highest quality of bentonite waterbars on the market. This is reflected in the fact that it can easily withstand 3 full wet / dry cycles without loss of important properties.

However, as with any bentonite based waterbar, at a certain point, washing out will be initiated.

There is a benefit of this phenomenon though in that minor concrete voids can be filled up with the bentonite.

The synthetic rubber is a high quality, durable product.

After >35 wet / dry cycles the material has been proven to keep its expansion potential. 

Weight

17 % heavier than synthetic rubber @ equal size.

586 % heavier than synthetic rubber @ actual size.

15 % lighter than bentonite mix @ equal size.

83 % lighter than bentonite mix @ actual size.

Mechanical properties 

The bentonite mix is butyl rubber based, and therefore has a low-level of, in relative terms, tensile properties and longitudinal tear strength.

Due to the consistency of the bentonite mix, the bar will not crack or split during the nailing process.

The synthetic rubber has a high-level of, in relative terms, tensile properties and tear strength. 

Due to the constancy of synthetic rubber the bar is likely to crack or split if punctured. Therefore, if nailing is required a containment such as Fixing Wire, must be used.  

History Bentonite based sealing profiles are well-known and have been widely used in the construction industry for more than 20 years.Synthetic rubber is a new innovation, proving an excellent alternative to bentonite.
* Often, when wet / dry cycles are referenced, it refers to laboratory condition tests where material is thoroughly wetted and then completely dried. In the ‘real world’ this is highly unlikely to occur unless very long periods of hot, dry weather are experienced between rain.

Static Waterbars

Static waterbars are, in simple form, a solid physical barrier placed at the joint line to produce a tortuous path for the water to navigate.

Manorteq Static waterbars have this technology as the primary barrier, but also have a secondary line of defence incorporated into them. This secondary barrier is either the HydroBar Original

technology which swells to seal; or a bitumen layer which adheres to the concrete creating an impermeable barrier.

All the Manorteq Static waterbars are made of galvanized steel. Whichever options your project requires the steel waterbar is protected from corrosion.

Material Comparison

Why Static waterbars instead of Active?

Is there a simple answer to this question? There are reasons to use Static waterbars, and reasons to use Active. In fact, it is not unusual to find construction sites using both types of system where demands of the of the site and the construction methods so require.

That said, Static waterbars are much more robust than any Active waterbar and can be left in situ for significant amounts of time prior to the subsequent pour. There are many additional non-waterproof benefits to Manorteq Static waterbars. Please consult your Manorteq representative for further information.

Are you interested?
If you have any questions on any of the products, please contact us.