Thank you for your question.

Although we are aware of Postcrete being successfully drilled for fixings, Postcrete has been designed and formulated specifically for the erection of fencing and smaller gate posts to be embedded within the material; as such, we would not consider it to be the best option for your particular application.

Assuming speed is one of your primary concerns, best practice would be to use our Extra Rapid Cement (https://tarmac-bluecircle.co.uk/product/extra-rapid-cement/) mixed with an all in ballast. The lager aggregate of the ballast (typically upto 20mm) reduces the chance of cracks forming while drilling the holes and/or tightening the fixing(s). Concrete made using Extra Rapid Cement will provide an excellent long term durable solution in your particular application while still gaining strength considerably faster than a concrete produced with a conventional cement.

I hope this information helps.

Kind regards