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Positive sealing with a variety of systems


There are several positive sealing systems available in the market:
Cementitious systems (polymeric cement based), bituminous systems (by-product of crude oil refining process, or by the other name “tar”) and polyurethane systems.
Implementation processes and integration of critical impact systems on project success.
Combining concrete restoration systems together with plaster systems and decorative finishing on a variety of types requires the use of material systems that know “talk to each other”, enabling continuity between the different systems without creating failure between the layers.
Therefore, every project requires a complete and broad specification that defines the systems and their interrelationships – including curing times, types of applied color families, types of adhesives and the interval of application (window of time) between system and system.

Preparing the area before applying the sealing system is crucial to the success of their chosen sealing solution.

1. Complete or partial removal (as needed) of the previous sealing system until stable infrastructure is required if concrete restoration is required for the infrastructure.
2. In case of sealing on existing tiles, care should be taken to roughen and remove the shine of the tiles and in addition, ensure full sealing of the existing joints (fugues).
3. Complete drying of the sealing infrastructure.
4. Cleaning the infrastructure from loose particles, dust and other contaminants.
5. Application of rollers (rounded / triple casting) to horizontal (floor) to vertical (wall) fences to allow good sealing and cracking in the corners of the infrastructure.
6. Filling nozzles / holes (including segregations) / Handling cracks and stitches in existing infrastructure while creating a homogeneous, smooth, uniform texture before applying the sealing system.                                                                                                                                                                                                                                                                                                       7. Videor / gradient creation in existing infrastructure (1.5-2%) assuming that the sealing system implemented transfers the existing surface and no gradients can be repaired.
8. Treatment and preparation of drains, sleeves and other types of pipes that are expected to pass through the surface intended for sealing.

Choosing a sealing system as a suitable sealing solution over time is a direct derivative of a number of characteristics that influence the writing of the technical specifications.

 

feature\System typeCement sealing systemBitumen sealant systemPolyurethane sealing system
UV sun resistanceNo resistantNo resistant(Requires coating)resistant and even reflective
Application RestrictionsPriority for application on cementitious infrastructure such as water reservoirs or concrete wallsPriority for application in non-sun exposed areas on a variety of infrastructureCan be applied to all types of infrastructure, including metal debts
Use in a damp / wet environmentCan be applied to moist infrastructureCan be applied to moist infrastructureIs not resistant and even sensitive to moisture and water (up to 4% moisture)
Using a foundation layerNot requiredrequiredUsually not required
Drying speedQuick – half an hour to an hour for touchMedium – hours to days for final dryingFast to medium – several hours
Make a cureYes – mandatorynono
Adapted to negative sealingyesnono
Flexibility with the other systemsLow (30-40%)High ( above 500%)Medium (100-200%)
Adapted for drinking wateryesnoyes-Depends on the product
System partsSingle / Two ComponentsUsually single componentsUsually single components
Application MethodBrushing / scrollingBrushing / scrolling / splashing in dedicated earlsBrushing / scrolling / splashing in earls
“Green” versionyesnoyes
Costs compared to other systemsMediuminexpensiveexpensive