Knowde Enhanced TDS
Identification & Functionality
- Product Type
- Technologies
- Product Families
Features & Benefits
- Ready-to-Use Product Features
- Advantages
- Light weight for high build in vertical or overhead use
- Able to be applied in 1” to 1.5 ” overhead lifts
- Integral fibers for added strength
- Includes corrosion inhibitor to protect steel reinforcement
- Non-shrink to provide structural repair of holes or cracks
- Excellent bond to existing concrete or masonry
- Dense for chloride ion repellency and durability
- Latex modification provides enhanced resistance to acids compared to standard concrete patching products
- Very rapid setting for minimal turnaround time
- Dries to a light concrete gray to blend better with surrounding concrete
- Contains no silica fume, gypsum, or metallic particles
- Easy to finish
- Versatile consistency for horizontal, vertical, and overhead repairs
- Does not require separate bonding agent for most applications
Applications & Uses
- Markets
- Applications
- Application Area
- Compatible Substrates & Surfaces
- Uses
- Rapid structural and cosmetic repairs to any vertical or overhead concrete on bridges, parking garages or wherever high strength repair mortar is required
- Fills holes, spalls, cracks or honeycombs on vertical or horizontal concrete
- Restore disintegrated surfaces of old concrete and masonry, cornices, lintels, sills, handrails
- Directions
Surface Preparation: Surface must be free of all dust, dirt, loose concrete, oil, grease, old asphalt, curing and sealing compounds, form release agents, efflorescence, or other contaminants that might interfere with adequate bond. Square cut perimeter of holes or cracks to a minimum width of 3/4 inch (1.9 cm) and depth of 1 inch (2.5 cm), undercutting to sound concrete when possible. Do not V cut cracks.
Exposed reinforcing steel must be cleaned to bright metal, removing all rust or signs of oxidation. Chip out concrete behind or under rebar to a depth of 3/4 inch (1.9 cm). Coat clean metal with an epoxy bonding agent such as Polyweld EPXCI to prevent further oxidation and deterioration.
Immediately prior to placement of ChemPatch Fast VO, remove any remaining dust or dirt with vacuum or oil free compressed air. Saturate surface with clean potable water to the point of rejection. Remove standing water or puddles.
Bonding: When undercutting or squaring the edges of the patch is impractical or when application must be made in hot or dry conditions, use Cretelox as the mixing liquid for the slurry bond coat. Do not allow slurry bond coat to dry out before application of the mortar. Do not add Cretelox to the ChemPatch Fast VO mortar itself. Refer to Cretelox product data sheet.
Mixing: ChemPatch Fast VO sets very rapidly. Mix only an amount that can be placed and leveled within 5 to 8 minutes. Condition the dry mortar and water to 65° to 75°F (18° to 24°C). Do not add accelerating or bonding admixtures. Do not add additional water or re-temper after initial mixing procedure.
To make mortar, measure 2 quarts (1.9 liters) of water into a clean mixing container, gradually add 50 pounds (22.7kg) of ChemPatch Fast VO to water and mix with high RPM, low speed drill with paddle for 2 to 3 minutes to achieve a smooth, slump free consistency for placement. Add up to 0.5 quarts (0.5 liters) of additional water only if needed. Do not over mix.Application: Due to its very rapid setting characteristics, place ChemPatch Fast VO mortar in lifts of not more than 1 to 1.5 inches (2.5 to 3.75 cm). Compact mortar firmly into repair to area filling all voids and air pockets paying special attention to spaces beneath any reinforcing steel. The top surface of each lift must have a 1/8 to1/4 inch (0.31 to 0.62 cm) raked profile. Keep surface of lift damp with fog spray, sprinkler hose or brush. Apply next layer within 12 to 18 minutes. When design depth is obtained, finish final placement to match surrounding surface tex-ture.
Curing: ChemPatch Fast VO continues to gain strength as long as it is damp. It generates considerable heat when used in quantity. Keep cool by wetting. Repaired areas should be kept damp for 20 to 30 minutes or cured with a water based curing compound such as Safe-Cure & Seal 309 or Polyseal WB. ChemPatch Fast VO gains strength very rapidly.- Special Applications
At temperatures exceeding 80°F (26.7°C), cool surface to be patched with cool, clean, tap water. Prior to mixing, keep material in cool place and use cold mixing water. Mix small batches that can be used quickly.
At temperature below 50°F (10°C), keep material warm and use lukewarm water to speed set.
Vertical / Overhead: Adjust consistency by using less water to make a stiffer mix.
Technical Details & Test Data
- Limitations
- ChemPatch Fast VO hardens in 20 to 30 minutes. Prepare only enough for immediate use.
- Do not use solvent based curing compounds.
- Recommended use of Cretelox acrylic bonding agent is limited to the slurry bond coat under high tempera-ture or dry conditions as described above. Do not add Cretelox to ChemPatch Fast VO mortar.
- Do not apply to frozen or frosted surfaces, warm sub-strate to a minimum of 40°F (4°C) prior to application. Do not apply if ambient or substrate temperatures are below 40°F (4°C).
- Do not add sand or gravel to extend. Do not use any admixtures other than those recommended by Chem-Masters.
- Technical Details
Estimating Guide Yield per bag 0.43 ft3 (0.12 m3)
- Technical Data
Test Formulation Material ChemPatch Fast VO
Mixing Conditions 73°F @ 50% relative humidity
Batch Dates: November 2015 Water Addition Rate: 9.5% (unless noted otherwise)
Curing: Air Cure, for 2 days, then moist cure
until testing unless notedASTM C157 Length Change (%)
Average of three 1x1x 11 1/4 “ specimens
Initial readings at 3 hours per ASTM C92828 day Air Cured -0.07 Water Cured 0.012 Length Change of Hardened Hydraulic Cement Mortar & Concrete Test Results (Hardened)
ACI 503R Direct Bond Strength (psi)
Average of three 2” diameter cores
Applied at 2” thickness over 4,500 sandblasted concrete1 day 7 day 28 day 278 349 372 Direct Tensile Test ASTM C348 Flexural Strength (psi)
Average of three 40 x 40 x 160 mm specimens1 day 7 day 28 day 873 1,118 1,523 Flexural Strength of Hydraulic Cement Mortars Test Results (Plastic) ASTM C138 (Density (lbs/ft3) 127.9 ASTM C191
Set Time (Vicat minutes)Initial: 17
Final: 19ASTM C469 Compressive Modulus of Elasticity (psi)
Average of three 4 x8” cylinders28 day 3.6 x 106 Static Modulus of Elasticity and
Poisson’s Ratio of Concrete in CompressionASTM C109 Compressive Strength (psi)
Average of three 2” cubes
ChemPatch Fast VO1 day 7 day 28 day 6,500 7,580 9,060 Compressive Strength of Hydraulic Cement Mortars ASTM C496 Splitting Tensile Strength (psi)
Average of three 3 x 6” cylinders7 day 28 day 441 500 Splitting Tensile Strength of Cylindrical Concrete Specimens ASTM C109 Compressive Strength (psi)
Average of three 2” cubes
ChemPatch Fast VO (10.4% water addition).1 day 7 day 28 day 4,050 4,380 5,280 Compressive Strength of Hydraulic Cement Mortars ASTM C666 Freeze Thaw Resistance : Procedure A
Average of three 3 x 3 x 11 1/4” specimens
Cured 28 days before testing. 300 cyclesDurability Factor Mass Loss Surface Condition
96.40 0.00% No change Resistance of Concrete to Rapid Freezing and Thawing ASTM C672 Salt Scaling (lbs/ft2)
Average of two 8 x 10 x 4” specimensScaling Loss @ 25 Cycles Scaling Loss @ 50 Cycles
0.0 lbs/ft2 Rating 0
No Scaling0.0 lbs/ft2 Rating 0
No ScalingScaling Resistance of Concrete Surfaces
Exposed to deicing ChemicalsASTM C882 Slant Shear Bond Strength (psi)
Average of three 3 x 6” specimens cast per ASTM C9281 day 7 day 28 day 2,598 3,038 3,140 Bond Strength; of Epoxy-Resin Systems Used
With Concrete by Slant ShearASTM C1202 Rapid Chloride Permeability (coulombs)
Average of two 2 x4” specimens28 day 1,197 coulombs (low)
Electrical Indication of Concrete’s Ability to resist
Chloride Ion PenetrationM-DOT Direct Shear Bonding Strength (psi)
Average of three bonded specimens
Bonded 1“ thick over 4 “ concrete cube1 day 7 day 28 day 214 354 378 NYSDOT 503-3P Freeze Thaw Resistance %
Average of three 2” cubes in lime-saturated
water for 6 days prior to testing.Mass Loss @ 25 cycles
0.00% Freeze-thaw test
Packaging & Availability
- Packaging Type
- Packaging
Packaging Product Number 50 lb (22.7 kg) bag 56 per pallet F2014.50
Storage & Handling
- Storage
Optimum storage temperatures are between 40 and 90oF (4 and 32oC). Store unopened bags on pallets in a dry area. Shelf life of properly stored material is two years from the date of manufacture.