Changing the stone size from 6 mm to 10 mm (or 10 mm to 14 mm or 14 mm to 20 mm) will reduce the water required to obtain a nominal 75 mm slump by about 10 L/m3. It is the reduction in water not the increase in stone size that increases the strength of the concrete.
Curing concrete means keeping the concrete wet to allow the mix water to chemically react with cement to develop the required strength. Curing time is the time taken for concrete to reach its optimum strength.
Covering the concrete with plastic or spraying with a curing compound is the most practical method.
A good practical mix would be 1:2:3 by volume mix. This means 1 part cement to 2 parts sand to 3 parts stone, measured with a container (e.g. a 10 litre bucket). Do not measure your mix by shovelfuls.
Cement is dry and flows easily while sand is usually damp and sticks together. The result is a shovelful of cement will lie fairly flat on the shovel and thus will be less in volume than a shovelful of sand.
Type GP is 100% General Purpose (normal portland) cement, Type GB is a General Blended Cement (approx 70% normal portland cement with 30% granulated blast furnace slag)
These times can vary depending on time of year, however their 28 day strengths are similar.
Concrete has a 28 day compressive strength of 25 MPa (if cured correctly). Speed Set is has a 28 day compressive strength of 10 MPa, however its fast setting characteristics mean that any supports to hold up a post may be removed after an hour.
DryPak Concrete can be used for structural projects such as driveways, footpaths and small slabs such as bbq and shed foundations. DryPak Speed Set is a non-structural concrete that is ideal for applications where fast setting speeds are required such as fence posts, letterboxes and other light load bearing applications.
Basic Mortar is a 1:4 sand/cement M4 mortar mix that is ideal for brickwork and applications below the damp course level or areas that are susceptible to high moisture such as, setting toilet pans, ridge tiles on roofs and the screeding of shower recess prior to tiling. Brickies Grey/Cream Mortar is a 1:1:6 sand/lime/cement mix that can be used for all general mortar applications above the damp course level.
No. Colouring oxides will not disperse homogenously, may result in stained pavers and will affect the product, preventing it from gelling as the product is designed.
Yes. However mixing instructions should be followed carefully as an excess of colouring oxide can affect the bonding characteristics of the product.
No. Any deviation from the instructions to the back of the bag can affect the workability of the product and may damage your pavers.
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