Want to know about Concrete Mix Ratio? The durability of your concrete is based on the accuracy of your cement mix ratio as it pins the durability. Knowing and understanding how to correctly mix the concrete and getting the correct ratio of cement mix assists to ensure that the job will last long.
What is Concrete?
A combination of building material, including the mixture of gravel or broken stones, sand and cement with water which hardens over time, is known as the concrete. The vast application of concrete mix in construction works makes it necessary to understand and know the advised quantities of the materials required in the concrete mix for a specific application as found appropriate. It is necessary to think of the possible concrete strengths ranging from C40 and down to C10 in this respite. C10 is the least strong, and C40 is regarded as the strongest possible.
Best Ratio of Concrete Mix for Domestic Tasks
The C20 is the medium strength of the concrete mix. For basic domestic constructions like retention of garden walkways, posts, and many more the C20 concrete mix ratio is the standard ratio. However, this sand and cement mix ratio is not advised for utilization in the construction of the base or other construction works that require a super-strong concrete mix.
If you have any major construction projects or structural adjustments, the building control officer, quantity surveyor or architect should suggest the strength needed for the concrete mix to be utilized. This is based on some parameters they are required to discover.
C20 includes the following appropriate ratio
- 1 part of cement
- Two parts of sand (fine aggregate)
- Four parts of gravel (coarse aggregate)
For 1 part of cement, six parts are needed when premixed ballast is required. If all the other materials are supplied completely dry, the water ideally to be utilized should be 55 per cent of the total weight of the cement. However, the materials, mainly the sand, is generally damp in reality. You then are required to reduce added water quantity. It definitely does not need up to a bag of cement mix if you have to fix a small fault in your fence. So if you will not use the left up concrete mix soon, it will be a waste then.
You can check in your neighborhood the DIY shed if they have mixed DIY concretes’ mortal stock, which might be suitable for the repair. For your skin, cement is not the best of powders. So, while working with the concrete mix, you need to be mindful of that. You should utilize proper materials and wear protective clothing. Make sure that you, while adding water take enough precautions because it is an estimation of the volume of water to be added.
Other Types and Strengths of Concrete Mix You Can Have
Based on the recommended utilization, various types and strengths of the concrete mix are available. Before the type of concrete can be selected, the essential factor that needs to be considered is the role of the concrete it has to serve. Different types and strengths of the concrete mix are;
- C10 Concrete Mix
- C15 Concrete Mix
- C15 Concrete Mix
- C25 Concrete Mix
- C30 Concrete Mix
- C35 Concrete Mix
- C40 Concrete Mix
To make the concrete mix, you will need some materials, which are;
- Aggregates: After buying them loose, you can request a lorry to supply the aggregates to you. Another aggregate option is ready-mixed cement, which you can buy from builder merchants. It is usually a cheaper option if you purchase it loose, but you need to check it with your local merchants. Your local merchants might have a great deal for you. A ballast may contain sharp grit or sand and small stones as it is a mixed aggregate.
- Water: To make the concrete mix, water is indispensable. It is not required in abundance despite its necessity. To ensure the concrete mix is strong, a calculated quantity of water is needed.
- Cement: Cement bags can be taken from builders’ merchants, and they come in either 25 or 50 kg. Limestone undergoes many steps of processing to turn into cement a sit is made from limestone.
Concrete Mix Ratio During Mixing Concrete
A proper combination and mixture of materials are necessary to have a good concrete mix. When ensuring appropriate quantities of materials are utilized, it is tricky to ensure that. The ballast will heap well on the shovel; the cement will not because cement will slide down from the heap. For the time being, 1 part of the ballast has to be equal to 1 part of cement. Instead of a shovel, it is then advised to utilize a headpan or a bucket to stop measurement errors.
Concrete Mixing Methods
Concrete mixing can be done by using different methods as you can mix the concrete manually with your hands or using a concrete mixer to mix the concrete. Ensure that they are equally damp if you are going to be making more than one batch of concrete, or it will not dry smoothly. This may evacuate some shrinkage or cracks in your concrete mix.
Mixing Concrete Manually or By Hand
- You are required to know how to mix the cement; it is okay if the concrete is small in quantity, or you will not be able to mix it thoroughly, and it will result in the bad quality of concrete.
You should follow the steps if you ever need to mix it with your hands:
- You need to cover the area with any suitable material or with a tarp. You can also utilize a mixing board that can be reutilized. You can also extemporize with a wooden piece. Consider the precautions as explained earlier and deploy the utilization of ratios. Put the materials on the tarp or at the center of the board in the recommended ratio.
- Mix the cement and aggregate until you get a uniform product that is the aggregate mixed wells with the cement. On another side of your board, scoop your mix pile. At the same time, you work your way through the pile break, the lumps smoothly heaping a scoop over the other.
- Scoop, put the needed amount of cement and collect the mixture together in the middle of your work area.
- You need to sprinkle over the top of your heap around a third of the cement and then blend as you did above by folding until the cement is mixed entirely and for the remaining two-thirds, repeat the process another two times. Break the lumps finely if there are any remaining. The cement is evenly mixed with the aggregate and sand to ensure this is the essential part of it.
- To make a hollow at the center, spread out the pile. The water is held in the hollow area you require to utilize. A third of the estimated water should only be added, which is needed for utilization.
- Slowly scoop from the outer side of the mix, working around the heap, into the hollow part crate with water and using your hand trowel or shovel, mix it well with the water.
- Have your hollow in the middle and make it a pile again, adding the second third of the water, then, like the first time, work your way around it.
- Sprinkle and spread the remaining water over the mix, turning it as you do, turning it inside out. This is to be done until the water is uniformly spread and the “molten” mix is water-saturated uniformly.
Using Cement Mixers to Mix the Concrete
If you require a lot of mixing, you can hire and use a cement mixer; it could be more economical to purchase one in the long run. You can sell it if you no longer require the cement mixer. A cement mixer generally gives the best quality, uniform product with no stress mixes by completely churning the concrete. These cement mixers are available in different volume capacities. You need to take the following steps and guidelines to use the mixer:
- You need to cover the area with a tarp and place the mixer in the middle of the area to stop any mess upon the floor. Utilizing a suitable extension cable, connect the mixer to a power source. To ensure it is working, turn the connection on.
- Start with three-quarters of the water and fill it with this need for the concrete, then add half the amount of sand and gravel.
- As you add the materials to the mixer, you must be conscious of not placing the shovel entirely into it. The mixer could twist the shovel out of your hand and overpower you. So it would be ideal if you learned to put the materials into the mixer without the shovel expanding into its drum. The shovel can hit you in the end while rotating in the mixer.
- Add all the cement required after that. While you turn the cement in the mixer, you might get a cloud of lime as cement is like dust which can irritate your eyes and skin as well as can make you cough.
- Finally, add the rest of your gravel and sand. Then, quit the blend to churn for half a minute before checking to examine if adequate water is there.
- While watching out for the consistency of the mixture, you can add only a small quantity of water if required and leave it around for a minute before adding water again.
- You may also utilize a sprinkler to damp the concrete mixture and try to gauge the quantity of water you are adding to the mixture. You are advised to never utilize a hose for water addition to the cement mixer.
- You can empty the drum of the mixer slowly by tilting the drum into a wheelbarrow when the concrete has mixed up satisfactorily. You can utilize a hand trowel to clean the mixer, of course, when it is stopped and try to get everything out of the mixer. When you are done with mixing the drum, rinse it out with water. To check out the quality of your concrete mix, you can carry out a slump test.
How to Protect Your Concrete Until it is Cured
There are several measures you need to take and understand to assist you concrete cure well depending on the condition under which you are working. Generally, your concrete is left with cracks once it is dried too fast. This concrete mix will also be weaker than it must be. But it comes out more potent when it dries out slowly. However, in freezing temperatures, your concrete cures literally slowly, but it does not mean it will be stronger.
The concrete water freezes, and the binding capacity of the cement is reduced. So, when the weather gets to a high temperature, pieces of ice or frozen water melt, your concrete is left with many minute cavities. Due to these cavities, the strength of your concrete is limited. Hence, it would be best to have the optimal temperature to work under to obtain the best result. If you cannot wait for suitable temperature and weather conditions, you can follow the following steps.
- On dry and hot days, let your concrete dry until it is a little strong. Then, cover the concrete up with bubble wrap and plastic sheets to minimize how quickly it dries.
- In low temperatures and cold days, you can cover or wrap or cover your concrete with blankets to maintain it warm and stop water from freezing. You might also select the warmest time of the day to keep the concrete firm enough before the temperature gets low.
It is instrumental in having a good concrete mix to have the correct composition of your concrete with the materials in the advised ratio. Utilizing an appropriate mixing method and assisting your concrete preserve well will also make the concrete long-lasting.