Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Product Type
- Technologies
- Product Families
Features & Benefits
- Labeling Claims
- Ready-to-Use Product Features
- Key Benefits
- Long-term warranty against water penetration.
- Long-term performance with no re-application or future maintenance required.
- 100% trafficable within 8 hours, with minimal risk of damage during construction or thereafter.
- Find stubborn cracks easily, with an easy fix.
- Non-toxic & biodegradable
Applications & Uses
- Applications
- Application Area
- Typical Applications
- Rooftops & podium decks
- Parking decks
- Facades
- Wharf decks
- Wharf decks & marine structures
- Water tanks
- Airport runways, taxiways, aprons
- Specialty applications
- Precast elements & panels
- Tiled shower recesses
- Product Application
Basic Requirements
TechCrete 2500 Waterproofing Agent must be applied to a clean, dry, dust-free concrete surface, at least 28 days old. If the surface is not clean, then the use of one of the following Alchemco Clean & Repair (ACR) products, or a shot blast system, is required for prepping the surface for warrantied applications. Chemical cleaning may require multiple applications and the use of different products to achieve complete cleaning.
- ACR Concrete & Masonry Cleaner
- ACR Emulsifying Cleaner
- ACR Concrete & Masonry Etch
- ACR Paint & Stain Remover
- ACR Rust Converter & Inhibitor
Where segregation or voids are apparent, chip out and treat with ACR Concrete Patch & Repair. Once repaired, allow at least 24 hours for patches to dry and cure. If works needs to be completed faster, then use ACR HP Concrete Repair. Do not apply where ambient temperatures are below 39°F or above 95°F. Do not apply within 24 hours of the surface being wet.
Application Rates
Normal - 1 gallon per 200 square feet (1 liter to 5 square meters) on average. Can vary depending on substrate absorption, which varies depending on the age of concrete and original density.
Application Method
- Locate all cracks and flood with solution, first ensuring they are filled with product.
- Apply the solution to the remaining area at a rate of between 160 - 240 square feet per gallon (4 - 6 square meters per liter).
- First watering is done when surface becomes touch dry - (usually 2 - 6 hours depending on wind conditions and ambient temperature) flood spray the treated areas with water. If product is still wet after 6 hours, begin first watering.
- On Step 2 - 24 hours later apply ACR Accelerating Agent.
- On Step 3 - 24 hours later water again.
- After the third watering, block drains and pond area for a minimum of 12 hours to verify the waterproof seal.
Performance Timeline
The TechCrete® 2500 Waterproofing Agent system utilizes a modified silicate gel forming technology to stop water penetration. TechCrete® 2500 Waterproofing Agent penetrates into the concrete to create a barrier to water, stopping the water from within the concrete rather than on the surface. The technology is catalytic in nature and requires between 3 - 5 days for the products to reach full water stopping capabilities. Full waterproofing should not be expected until complete gel formation has been achieved.
NOTE - The surface will continue to accept water, so a flood test will be required to determine if full waterproofing has been achieved.
- Limitations
- TechCrete® 2500 Waterproofing Agent is not suitable for sealing working volatile cracks as a result of structural defects or caused by mechanical damage. (See large or stubborn cracks)
- The product is NOT suitable for sealing where segregation and voids are likely such as construction joints and pour joints. Nor is it suitable around penetrations where there is a non-masonry/cementitious interface.
- Curing Compounds - Water curing is preferred. Aqueous acrylics that degrade within 28 days are also suitable. Other materials such as chlorinated rubber, resins and wax emulsions are suitable, but must be completely removed by grit blasting or grinding to allow product penetration.
Properties
- Color
- Typical Properties
| Value | Units | Test Method / Conditions | |
| Specific Gravity (77°F) | 1.2 | — | — |
| Boiling Point | 214.0 | °F | — |
| Viscosity | 14.3 | cP | — |
| pH | 11.51 | — | — |
| Non-Volatile Solids | 26.55 | % | — |
Regulatory & Compliance
- Quality Standards
- Testing
- The NSF/ANSI 61 is a set of national standards that relates to water treatment and establishes stringent requirements for all equipment and products that come in contact with either potable (drinking) water or products that support the production of potable water.
- TechCrete 2500 Waterproofing Agent has been UL Certified NSF/ANSI 61.
Technical Details & Test Data
- Performance Characteristics
- UL Classified NSF/ANSI 61
- Safe for potable (drinking) water.
- Seals cracks up to 5/64” on initial application and will seal future non-structural cracks up to 1/64”, except for cold joint applications.
- Reduction of chloride diffusion coefficient by 89% to 3.5 (10-12 m2/s).
- Increases surface hardness from 6 to 8 on Moh’s scale.
- Reduces scaling in freeze-thaw environments by 89% at 50 cycles.
- Allows 84.1% moisture vapor permeability.
- Suitable for tanking applications (positive hydrostatic pressure) - tested to 400 meters (1,312’).
- Detailing Requirements
Cold Joints
Existing Construction A cold joint is a plane of weakness in the concrete caused by an interruption or delay in the concreting operations. Due to the potential for unseen voids to occur below the surface of the concrete at the cold joint, cold joints must be treated with the additional application of ACR PolyMembrane Flashing. Once the initial application of TechCrete 2500 Waterproofing Agent has been applied and is dry, ACR PolyMembrane Flashing is applied no less than 4” wide to the surface of the concrete over all areas designated to be cold joints.
Upturns/Hobbs
Stripseal the cold joint between upturn and slab with liquid applied ACR PolyMembrane Flashing extending 4” either side.
Penetrations
Use ACR PolyMembrane Flashing extending 4” (101 mm) around penetrations and at least 6” up the drain, fulgo inlets etc. Use TechCrete WT Joint System for all areas where expansion joints are specified or required.
Large Cracks
For cracks greater than 1/64” and less than a 5/64”, create a small dam and flood crack with product, repeating the application process. For cracks larger than 5/64” use ACR Concrete Patch & Repair or ACR HP Concrete Repair. ACR PolySeal Sealant should be used if there is a risk that the joint will move in the future.
Underside Crack Preparation
For waterproofing applications where the underside of the horizontal surface is exposed, cracking may be evident. If these cracks or voids telegraph all the way thru the concrete slab, they may allow TechCrete® 2500 Waterproofing Agent to flow through and out of the concrete. To avoid loss of product and failure of the system, it is required that an application of ACR PolyMembrane be made to the underside of the concrete slab (prior to the start of any waterproofing applications). Using a 4” foam roller, apply a coat of ACR PolyMembrane Flashing to the surface and then let dry for at least 4-6 hours prior to the waterproofing application. An alternative method is to use 4” (101 mm) wide high-quality duct tape and seal the underside of crack. After application of waterproofing system, duct tape may then be removed.
Safety & Health
- Precautions
- Protect glass, aluminum, wood and painted surfaces, terra-cotta and glass-glazed tiles, red brick, marble and travertine from overspray.
- Hazardous chemical - Sodium Silicate
Packaging & Availability
- Packaging
TechCrete 2500 Waterproofing Agent comes in the following sizes,
- 5 gallon Pails (18.92 liters)
- 55 gallon drums (208.2 liters)
Storage & Handling
- Shelf Life & Storage
- No known limit to shelf life.
- Keep container sealed and avoid prolonged exposure to direct sunlight.
- Always agitate drum or container before use.