Technologies used for Active and Static Waterbars and Mortars.
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.
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.
The big differences between synthetic rubber and sodium bentonite are:
|Bentonite / Clay Mix||Synthetic Rubber|
|Sealing Force / Expansion||At a size of 20 mm × 25 mm the sealing force is up to 1.25 tonne per metre||At 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.
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.
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.|
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.
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.
AquaRend Mortars are in general, single-component dry mortar mixtures designed specifically for creating waterproof layers on concrete and masonry substrates.
All Manorteq AquaRend mortars have been developed specifically to create a layer upon a substrate, utilising the market leading crystalline technology within it.
Due to the crystallization process within the pore tracks of the AquaRend system, a waterproof layer is a created which is impermeable to liquids such as water, oil, oil-based products, organic solvents, etc.
AquaRend products that include the crystalline technology are waterproof up to 50 metres hydrostatic head (limit of test).
If required, paints or other coatings can be directly applied on to the AquaRend repaired area. Any application of paints or coatings must be of a breathable nature. If in doubt, please refer to your Manorteq technical representative.
All AquaRend waterproof mortars are in accordance with EN 1504-3 and are classified as either an R3 or an R4 mortar.
The crystalline technology used within Manorteq cementitious based products is completely compatible with Xypex treated concrete, allowing for a seamless, continuous waterproof barrier.
The crystalline formation is a non-soluble matrix within the product. This primary and most distinguishing performance feature creates a crystalline structure within the pores and capillary tracks of the render permanently sealing against the penetration of water and other liquids from any direction.
AquaRend Fix-B is a reinforcement mesh made from basalt fibre. Basalt fibre is manufactured by the melting of crushed and washed basalt rock at approximately 1500 °C. The molten rock is then extruded through fine nozzles to produce continuous basalt fibre.
Basalt fibres have a high elastic modulus resulting in high specific strength; typically, three times that of steel.