Surface Preparation: Cable ducts, injection points and injection equipment should be tested for leaks using suitable water pressure. Before grout injection water should be blown out. Formwork should be erected and made grout tight.
The formwork must be designed with sufficient head to ensure grout flow into and across the grouting area. Saturate the grouting area with water, leave for one hour then blow out any surplus water.

Mixing: For 50kg cement mixes the use of a high torque slow speed drill with a Grout Stirrer is suitable. For larger mixes use a standard grout mixer. Pour the required quantity of clean water into the mixing vessel. Slowly add the cement or cement and sand to the water whilst continually mixing and sprinkle in the Groutex. Continue mixing for three minutes to achieve a consistent mix. Pass mixed grout through a suitable sieve to remove any formed lumps.

Application: Cable duct grouting will be carried out by pumping. Ensure a continuous supply of grout to the pump using a holding tank if necessary. Agitate grout in the holding tank to assist with maintenance of grout fluidity. The continuous feed of freshly mixed grout enables early placement to obtain maximum expansion effect. Grout should be placed within 20 minutes of mixing. Place continuously from one side of the formwork until grout appears at the opposite side of the grouting area. Do not disturb once grouting has been completed until grout has hardened.

Curing: Groutex mixes may be placed at temperatures between 5°C and 45°C. For temperatures outside this range contact the Technical Service Department. Placed grout
which is exposed should be cured in accordance with good concrete practice including water spray and spray applied curing membrane.