If concrete is needed for a project and using a truck full of premixed concrete is not an option, then it will have to be blended on site. So what does that entail? Well, the good news is that at Centenary Landscaping Supplies, we have Concrete Blend already mixed in our Darra yard where the sand and drainage gravels are blended in the correct ratios ready for you to add cement.
As with all materials, if you need a hand in working out the volume required, then give us a call at the office remembering that you can buy the Concrete Blend in any amount you like, from a shovel to a full truck load.
There are two concrete blends available, both feature a 10mm stone and are more than capable of performing most tasks around the home and garden be it a concrete slab for a garden shed, footings for a retaining wall, garden edging, etc. The recycled option features a manufactured sand mixed with a crushed concrete gravel.
When calculating the volume of concrete blend required for a slab or path always allow for a little bit of shrinkage, as when water is added and all the voids are filled the total volume of the mix is slightly less. For example, if the exact mathematical volume needed is 2.3m3, then closer to 2.5m3 would be needed. Plus, there’s nothing worse than running one barrow short of concrete.
As a general rule of thumb, you will need 16 bags of cement (20kg) to go with every cubic metre of concrete blend (1 cubic metre of blend weighs 1.8 Tonne). This equates to roughly 16 mixes in a 2.2 cubic foot mixer. which would be roughly 16-20 barrow loads. Now you know what you’re in for!