Dry Shotcrete

03 37 13 | No. 8713-400 | Print Version | Safety Data Sheet


SPRAY-CON DS is a Portland cement based, fibre-reinforced, micro-silica modified dry shotcrete (Gunite).


For vertical and overhead repairs of concrete ceilings, walls, columns and beams in parking garages, water storage tanks, swimming pools, concrete silos, tunnels, bridge piers and other concrete structures. SPRAY-CON DS is also used for rock and soil stabilization.


  • Easy, crack-free, thick to thin application
  • Up to 300 mm (12″) in a single application
  • Long lasting crack resistance
  • Low shrinkage
  • Excellent freeze/thaw durability
  • High bond strength
  • Salt resistant
  • Waterproof
  • Air cured
  • Sulphate resistance
  • Prevents chloride ion penetration
  • Non-toxic, non-flammable
  • Superior workability = easy to apply
  • Breathable
  • Resists most oils, solvents and chemicals
  • Labour saving system
  • Low rebound
  • High early strengths
  • Formulated to minimize dust


22.7 Kg (50 Lb.) Bags


10.2 L (0.39 ft.3) and covers approximately 1.72 m2 @ 6 mm (18.5. ft.2 @ ¼”) thickness per bag.  Allowance must be made for waste and “cut-off”.


When stored on pallets in a dry, cool area, shelf life is 12 months.


Compressive Strength
(ASTM C109)
5,900 – 7,100 psi
(40.5 – 48.8 MPa)
Modulus of Rupture
(ASTM C348)
1,100 – 1,300 psi
(7.9 – 8.9 MPa)
Bond Strength with Concrete Exceeds the tensile strength of concrete substrate
Colour Dark Grey


Surface Preparation … Remove all loose, delaminated, or grease-contaminated concrete. Use sand blasting, scabbling, high pressure water blast [min. 55.1 – 68.9 MPa (8000 – 10,000 psi), or other approved methods to remove any laitance, dirt, and efflorescence.  Mechanically roughen or high pressure water-jet existing concrete substrate to a minimum concrete surface profile of CSP-5.

Reinforcing Steel … Remove concrete behind the reinforcing steel to 25 mm (1″) depth. Remove loose rust from the surface of the reinforcing steel and apply two coats of FIBRE-PRIME rust proofing.

Crack Treatment …  Mesh all dynamic cracks with galvanized welded wire fabric mechanically fastened over the crack.

Application Method … Spray apply SPRAY-CON DS using dry shotcrete equipment in accordance with ACI 506- R85, Guide to Shotcrete. Use predampener to adjust the moisture content to 3-4% to reduce dusting and rebound. During shotcreting, the nozzle distance from the substrate should be 0.6 – 1.2 m (2′ – 6′) and the nozzle angle to the substrate 90 degrees. The consistency of SPRAY-CON DS should be similar to a firm jelly.

The excess of the material is “cut -off” (sliced) with a sharp trowel. The surface is then finished using a broom or wood float, or can be steel trowelled for a smooth finish.

Curing … SPRAY-CON DS must be wet cured for two days. Protect against fast drying using a surface evaporation retardant, water-based curing compounds or fine water mist.  1100 or the VOCOMP series from W. R. MEADOWS can be used for curing.  EVAPRE from W. R. MEADOWS can be used as the surface evaporation retardant.  When working under tarps at freezing temperatures, use electrical heaters. Avoid using propane heaters to prevent carbonation of the material.

Cleanup … All tools and equipment must be cleaned with water immediately after use.  Cured material must be removed mechanically.


Do not apply SPRAY-CON DS when the temperature is expected to be below 4° C within 48 hours. Follow Hot Weather concreting procedures when applying SPRAY-CON DS at temperatures exceeding 25° C.