A concrete slab s strength depends on how the concrete its mixed.
Correct mix for concrete floor.
When both fine and coarse aggregates are poorly graded the following general rules regarding suitable proportioning of these will be found helpful.
For maximum size of coarse aggregates as 20mm and over sand should be two thirds as much as coarse aggregates.
The best combination would be 1 part cement 2 parts sand small aggregates 3 parts gravel large aggregate and 1 part water.
By measuring the cement stone and sand you will have a consistent concrete mix throughout your entire project.
So picking a mix with an appropriate strength the correct frame or mold into which it is poured and the proper thickness of the pour is the most important.
Simply pouring wet concrete into a hole in your driveway sidewalk or basement floor won t make for a lasting repair.
Accurate concrete mixing ratios can be achieved by measuring the dry materials using buckets or some other kind of measuring device.
When durability is key high strength concrete makes a great choice.
Add more water and mix the concrete further.
Choose whether you need ready mix concrete delivered or plan to mix your own from a dry mix.
This is ideal for foundations footers and heavy equipment.
To make 1 cubic metre of 15 mpa concrete you will need to mix 5 1 2 bags of cement with 0 75 cubic metres of sand and 0 75 cubic metres of stone.
For larger jobs you could rent a mixer 35 per day but it may be more economical to simply order ready mix concrete.
For maximum size of coarse aggregates as 40mm and over sand should be half as much as coarse aggregates.
When you mix concrete properly it ends up with a consistency that has been compared to cookie dough.
Since garage floors will be supporting heavy equipment such as cars and trucks you need to make sure that the concrete mix you use will effectively provide the needed strength to make your concrete mix get some cement sand gravel and water.
Mix the concrete well and you ll pour a slab that s likely to reach the concrete s rated compression strength.
When you need to support a fence or mailbox post or create a small concrete slab fast setting concrete makes a great choice.
However it s easier to move and dump concrete that s mixed in a wheelbarrow.
Holes 1 inch or deeper require a concrete mix with coarse crushed stone aggregate which bonds well with existing concrete.
If it is too dry the channel walls will be crumbly.
Whether you hand mix concrete in a plastic tub homemade mixing tub or wheelbarrow the technique is the same to find the right concrete mix ratio.
The less water you use to mix the concrete somewhat dry but workable the stronger the concrete mix.
The first decision is deciding what type of concrete works best for your project.
This sets in just 20 to 40 minutes.
To test the consistency use the blade of your shovel like a knife and try to cut a shallow channel through the surface of the premix concrete.
Shallower holes need a sand mix.
Large batches of concrete mixes.
