Knowde Enhanced TDS
Identification & Functionality
- Product Type
- Technologies
- Product Families
Features & Benefits
- Ready-to-Use Product Features
- Advantages
- Initial set in 13 to 19 minutes at 72oF (22oC).
- Repairs from 0.50 inch (1.3 cm) to full depth.
- Extremely versatile - use for horizontal repairs or as a form and pour mortar to repair vertical columns and overhead beams.
- Non-shrink with exceptional bond strength.
- High early strength gaining 3000 psi (21 MPa) in 2 hours at 72oF (22oC).
- May be placed down to 20°F (-7°C) if ACI 306 cold weather concreting standards are followed.
- Accepts rubber wheeled traffic over road surfaces or industrial facilities in 2 hours.
- Resists freeze-thaw cycles and deicing chemicals.
- May be extended for economical placement at depths greater than 1.5 inch (3.8 cm).
- Contains migrating corrosion inhibitor for superior protection of structural rebar.
- May be coated in as little as 4 hours
Applications & Uses
- Markets
- Applications
- Application Area
- Compatible Substrates & Surfaces
- Uses
- Structural repairs to heavy traffic substrates including concrete decks, bridges, parking garages and roadways.
- Fast setting repairs to high load concrete such as loading docks and industrial floors.
- Form and pour repairs to vertical columns and overhead beams.
- Repair adjacent construction and expansion joints.
- Directions
Surface Preparation: If using ChemSpeed 75 as replacement concrete, area to be repaired 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 to a minimum depth of one inch (2.5 cm), undercutting to sound concrete when possible.
Exposed reinforcing steel (NACE 3 Standard SSPC SP6) must be cleaned to a bright metal removing all rust or signs of oxidation. Chip out concrete behind or under rebar to a depth of 3/4” (1.9 cm). Coat any exposed steel with Polyweld EPXCI or other corrosion inhibiting bonding agent as specified and allow to dry. Immediately prior to placement of ChemSpeed 75 remove any remaining dust or dirt with vacuum or oil free compressed air. Saturate the prepared area with clean, potable water to the point of rejection. Remove any puddles or standing water immediately before placing mortar so that concrete is in a Saturated Surface Dry (SSD) condition. If using ChemSpeed 75 to build a new area, follow all normal surface preparation procedures for concrete placement including compacting the substrate, forming the area, addressing drainage issues, etc. Apply form release agent to forms and allow to dry.Mixing: Condition the dry mortar and clean potable mix water to 65° to 75°F (18° to 24°C). Use 2.5 quarts of clean potable water per 50 lbs of ChemSpeed 75.Do not add additional water or re-temper after initial mixing procedure. When mixing one bag use a vari-able speed drill with a jiffler paddle. For multiple bags or deeper pours use a mortar mixer. Refer to Esti-mating Guide for water requirements and yield. For deeper pours add up to 35 lbs. of clean stone to the mix. Add ChemSpeed 75 to the mixing vessel and continue mixing for approximately 3 minutes to achieve a lump free consistency. Do not over mix. Add up to 1/2 pint of additional water per bag to ad-just to the desired finishing consistency.
Over watering causes excessive shrinkage and lower strengths. In exterior applications, check the air con-tent of the mix prior to pouring. If the air content is under 3% add up to 1/2 ounce of chemical air en-training agent per bag to get the air content up to 6%.APPLICATION: Scrub a mortar bond coat into the repair area being sure to fill all voids and pores. Do not allow bond coat to dry before placement of mor-tar. Poor substrate conditions may require the use of a chemical bonding agent. Compact mortar firmly into repair area filling all voids and air pockets paying special attention to spaces beneath any reinforcing steel. Vibrators are recommended for deeper pours or where reinforcing steel is used. Finish the same as ready-mix concrete with floats, trowels, or brooms.
CURING: ChemSpeed 75 continues to gain strength as long as it is damp. Apply a curing compound that meets ASTM C309 or ASTM C1315 such as Polyseal, Polyseal A, or Polyseal WB as soon as all bleed water has dissipated and application will not mar the surface. Call ChemMasters’ Technical Ser-vice Department for recommendations regarding other curing methods. Light foot traffic may be al-lowed in approximately 24 hours.
Extreme Temperature Application: Temperatures above 80°F (26.7°C) - Cool the substrate with cool clean potable water. Prior to mixing keep material in cool, dry area, and use cold water for mixing. Tem-peratures below 50°F (10°C) - Keep material warm and use lukewarm water to speed set time.
Technical Details & Test Data
- Limitations
- Do not apply to frozen or frosted surfaces. Warm substrate 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).
- Technical Data
Estimating Guide Yield per bag 0.42 ft3 (0.012 m3)
With 60% extension 0.60 ft3 (0.017 m3)
Test Formulation Material ChemSpeed 75 Mixing Conditions 73°F @ 50% relative humidity
Batch Dates: September 2015 Water Addition Rate: 2.5 quarts per 50 lbs of ChemSpeed 75
Curing: Air Cure, 50 % relative humidity @ 73°F
Where Extended: 50 lbs ChemSpeed 75 with 30 lbs 3/8” ssd pea gravel
Test Results (Plastic) ASTM C109
Flow@ 5 minutes: 138%
@ 15 minutes: material set upASTM C1611
Slump Flow Extended24.25 in ASTM C191
Set Time (Vicat)Initial: 16 minutes
Final: 25 minutesTest Results (Chemical) AASHTO T105: Sulfate
Sulfate Content (SO3)
Sulfate Content (SO4)1.07%
1.28%ASTM C1218:
Water Soluble Chloride0.00% * Material extracted from cast cylinder cured 28 days before testing. Test Results (Hardened)
ASTM C109 Compressive Strength (psi)
Average of three 2 inch cubes1 day 7 day 28 day 7,810 11,610 13,240 Compressive Strength of Hydraulic Cement Mortars ASTM C157 Length Change (%)
Average of three 3x3x11 1/4 “ specimens
Initial readings at 3 hours per
ASTM C928 Air Cure1 day 7 day 28 day -0.044 -0.082 -0.1 Length Change of Hardened Hydraulic Cement Mortar & Concrete ASTM C157 Length Change (%)
Average of three 3x3x11 1/4 “ specimens
Initial readings at 3 hours per
ASTM C928 Water Cure1 day 7 day 28 day 0.004 0.004 0.011 Length Change of Hardened Hydraulic Cement Mortar & Concrete ASTM C348 Flexural Strength (psi)
Average of three 40 x 40 x 160 mm specimens1 day 7 day 28 day 795 1,052 1,135 Flexural Strength of Hydraulic Cement Mortars ASTM C469 Compressive Modulus of Elasticity (psi)
Average of three 4 x8” cylinders1 day 7 day 28 day 3.66 x 106 3.84 x 106 4.22 x 106 Static Modulus of Elasticity and Poisson’s Ratio of Concrete in Compression ASTM C496 Splitting Tensile Strength (psi)
Average of three 3 x 6” cylinders1 day 7 day 28 day 446 626 668 Splitting Tensile Strength of Cylindrical Concrete Specimens ASTM C39 Compressive Strength (psi)
Average of three 40x 40 x 160 mm specimens1 day 7 day 28 day 5,952 8,050 9,310 Compressive Strength of Cylindrical Concrete Specimens ASTM C531 Linear Shrinkage and
Coefficient of Thermal Expansion
Average of four 1 x 1 x 10” specimens7 day 28 day Coefficient of Thermal Expansion
-0.08% -0.10% 6.2 x 10-6 in/in/°F
Linear Shrinkage and Coefficient of Thermal Expansion of Chemical- Resistant Mortars, Grouts, Monolithic Surfacing,
and Polymer ConcretesASTM C666 Freeze Thaw Resistance : Procedure A
Average of three 3 x 3 x 11 1/4” specimens
Air cured until 28 days before testing. 300 cyclesDurability Factor Mass Loss Surface Condition
97.7 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 Chemicals ASTM C882 Slant Shear Bond Strength (psi)
Average of three 3 x 6” specimens cast per ASTM C9281 day 7 day 28 day 3,001 3,780 3,914 Bond Strength; of Epoxy-Resin Systems Used
With Concrete by Slant ShearASTM C1583 Direct Bond Strength (psi) Average of three 2” diameter cores
Material applied at a 2” thickness over 4,500 psi sandblasted concrete1 day 7 day 28 day 276 429 471 Tensile Strength of Concrete Surfaces & the Bond Strength or Tensile Strength of Concrete Repair and Overlay Materials by Direct Tension (Pull-off Method) M-DOT Direct Shear Bonding Strength (psi)
Average of three bonded specimens
Bonded 1“ thick over 4 “ concrete cube1 day 7 day 28 day 282 320 366
Packaging & Availability
- Packaging Type
- Packaging
Packaging Product Number 50 lb (22.7 kg) bag 56 per pallet F2035.50
Storage & Handling
- Storage
Store between 40° and 90°F (4° and 32°C) in un-opened bags on pallets in a dry area. Shelf life of properly stored material is one year from date of manufacture.