Made by Cement Australia
Cement · Blended
Builders Cement 20kg
Type GB blend of cement and fly ash or slag, for a creamy, easy to work mix with a smooth finish.
Comes on pallets of 48 or 84 × 20kg bags.
1 bag (less than a pallet).
Lead time: Approx. 1 to 2 working days
Code: 200841955
Available to order from Allmat. Click and collect or delivered across Adelaide.
How many bags do I need?
Work it out with the free Allmat concrete calculator.
About Builders Cement 20kg
A uniform blend of Portland cement and fly ash or slag, made to the Type GB requirements of AS3972 and also meeting Type SL and SR. Concrete made with it is easier to work, keeps gaining strength over time and lasts better. Early strength gain can be slower than GP cement, so curing matters more.
Cement Australia recommends it for mixing your own concrete at home, for a creamy mix and a smooth surface.
- Type
- GB to AS3972
- Also meets
- Type SL and SR
- Blend
- Portland cement with fly ash or slag
- Finish
- Creamy mix, smooth surface
- Early strength
- Slower than GP, so cure it well
- Curing
- Keep moist for 7 days
Concrete and render ratios with the bags of cement per m3 are in our mix ratio table; mortar mixes are on the mortar calculator.
Best for
- Mixing your own concrete at home
- Small paths and footings
- Brick and block mortar
- Wall render and grouts
Not for
- Work that needs a fast set or high early strength, where a specialised cement suits better
How to use
- Combine Builders Cement with sand and clean aggregate in the ratio for your job, in a barrow or tub that will not soak up water. A mixer saves effort on larger pours.
- Bring in drinkable water slowly and mix through, using only enough for a creamy, workable mix.
- Place it straight away, then keep it moist for a week. Blended cement depends more on curing for full strength.
Storage & safety
Keeps about 6 months from manufacture, sealed, dry and off the ground. Do not use a bag that has gone hard. Wear dust-proof goggles and PVC or rubber gloves. Each 20kg bag is a two-person lift. Storing and handling bagged cement.
- Its Safety Data Sheet also warns against breathing the dust.
Documents
The manufacturer's own sheets. Open one to read it on the page, share it or download the PDF.
Builders Cement questions
Yes, that is what Cement Australia recommends it for, on jobs of about 0.1 to 0.5m3, and it gives a creamier, easier to work concrete with a smooth surface finish. For how much sand and aggregate to add, see our mix ratio table, linked below these questions.
As cement : sand : lime, Cement Australia's data sheet gives 1 : 3 : 0 to 0.2 for a high durability mortar such as a retaining wall, 1 : 4.5 : 0.2 to 0.5 for maximum bond such as structural brickwork, and 1 : 6 : 1 for general purpose mortar. Wall render is 1 : 3 with no lime.
Linked from these answers: Mix ratio table
Sources and guidance
The product information on this page comes from Cement Australia's published product data sheets, safety data sheets and website (see Documents above). It is general guidance only. Other manufacturers may give different advice for their own products, so always follow the instructions on the bag and the product's data sheet. Structural work, such as footings for buildings, must follow your engineer's design and the relevant Australian Standards.
You may also need
Often ordered with this product. Use + Add to pick the option and quantity and put it on the same quote.
General Purpose Cement 20kg
Straight Type GP cement for mixing your own concrete, mortar, render and grout.
Low Carbon Cement 20kg
A direct replacement for GP cement with 30% less embodied CO2, using the same mix ratios.