ballest concrete

How Much Ballast for 1m3 Concrete

If you’ve ever worked with concrete, you know that the mix design and raw material ratio are extremely important. Getting the right mix is crucial for the success of the project from start to finish. Moreover, it ensures us that the projects we complete are safe structures. One of the key components in a concrete mix is ballast. But how much ballast do you need for 1m3 of concrete? Well, that’s what we’re going to find out today. 

It is next to impossible to declare how much ballast you need for 1m3 concrete. Still, don’t lose hope because, by the time you’re done reading this, you will know how to calculate it for yourself. Further, the reason we cannot state the specific amount of ballast is that there are a lot of variables in between. 

Read More: How To Calculate Cement Bags for Concrete of Different Grades?

What is Ballast in Concrete?

Ballast, in the context of concrete, is a coarse aggregate made up of larger particles. These particles are typically gravel or crushed stone. It is an essential ingredient in the concrete mix and serves as a filler. In addition to this, it is responsible for providing strength and stability to the structure. 

Moreover, ballast plays a crucial role that guarantees that the mix is well-balanced. Not to mention, it makes the structure capable of withstanding the stresses and loads that it will be subject to. 

The Importance of Ballast in Concrete Mixes

The inclusion of ballast in concrete mixes serves several essential functions:

  • Ballast contributes to the density of concrete. It makes it more robust and capable of bearing heavy loads. 
  • By adding ballast, you can reduce the potential for the concrete to shrink. This further reduces the risk of cracking or developing voids as it cures. 
  • Using the right amount of ballast can save costs by decreasing the need for excessive amounts of cement. 
  • Moreover, ballast helps improve the workability of the concrete mix. To be specific, ballast makes it easier to handle the concrete mix during the construction project. 

Calculating the Amount of Ballast Needed

To determine how much ballast you need for 1m3 of concrete, you must first understand the composition of a 1m3 concrete mix. In a typical 1m3 mix, you’ll have cement, sand, ballast, and water. The precise quantities of each component depend on the desired concrete strength and other factors. More on this below…

Factors Affecting the Amount of Ballast Required

Numerous factors influence the amount of ballast you should use. Here are two of them:

Type Of Ballast

The type of ballast you choose can significantly impact the concrete mix. Different types, such as crushed stone or gravel, come in various sizes and materials. It’s crucial to select the type that best suits your project’s requirements. 

Since ballast types are highly varied, the amount you will need depends on your project requirements. 

Desired Concrete Strength

The required strength of the concrete also affects the amount of ballast. High-strength concrete mixes may require more ballast. For instance, foundations require strong and durable concrete. Consequently, you will need 8 parts ballast for 1 part cement. 

If you are unsure, it is best to consult a Concrete Supplier for this. Further, you can also use mix design software to get precise calculations. 

Preparing to Mix Concrete

Before you start mixing concrete, take some precautions. 

Safety Precautions: 

Wear appropriate gear, including gloves, goggles and a mask. Concrete can be caustic and may cause skin or eye irritation. To avoid issues, you can acquire premixed concrete from your Concrete Supplier.

Read more: Everything You Should Know About This Premixed Concrete

Gathering Materials and tools: 

Moreover, make sure that you have all the necessary materials and tools. It includes a concrete mixer or a wheelbarrow, a shovel, and a measuring container. In addition, you may need a concrete pump for a larger quantity of concrete. 

Measure Ballast and Other Ingredients and the Mixing

Once you’ve taken the safety precautions and got your materials together, it’s time to measure the ballast and other ingredients. Accuracy is crucial in this step! Follow the instructions on the cement bag to understand the best proportion for each component. Also, you can seek expert opinion from an engineer or a Concrete Supplier. 

Mixing concrete is both an art and a science. It’s paramount to achieve a homogenous mix to maintain the structural integrity of your project. Take your time and mix thoroughly, ensuring there are no pockets of unmixed material. It is advisable to use a volumetric mixer for accuracy. 

Pouring and Curing the Concrete

Mixing concrete is like starting a timer. Once you begin the mixing process, it is time to act quickly. After all, we use cement as a key ingredient, and when you mix it with water, it begins to dry at the first contact with air. So act fast and pour the concrete into the mould or formwork. At this point, you will want to confirm that the pouring is level and free of air bubbles. Air pockets have a terrible impact on the structure and can weaken it beyond repair. 

Besides, proper curing is equally important for strength. The longer it takes, the stronger the end product will be. If your project is located in a dry clime, you can cover the concrete with plastic or wet curing blankets. Many sites spray the top layer with water and cover it with a tarp. This step will keep it moist for several days, slow the curing process and result in strong structures.

Common Mistakes To Avoid

Despite our best efforts, we may end up making mistakes. But with a little awareness, you can put a stop to the more riskier ones. Moreover, here are some common mistakes that you can avoid when you’re working with concrete and ballast. 

Careless measurements: 

If you visit the batching plant of your Concrete Supplier, you will see how many protocols are in place to ensure accurate measurements. This is because a minor mistake can impact the entire outcome of the project. Consequently, you should take the measurement process seriously. 

Insufficient mixing:

When it comes to concrete, there is no such thing as overmixing. But it can result in a non-uniform mixture. Not only will inadequate mixing affect the properties you’re hoping to achieve, but it will also risk the structural integrity. On the contrary, the more you mix, the better quality it will turn out. 

Neglecting curing: 

Improper curing can cause it to dry too quickly. This often results in cracks and compromises the strength, too. 

Using Ready Mix Concrete

Some may even go as far as to say that manual mixing is a method of the past. There is some truth in this as more and more modern construction professionals prefer ready-mix concrete or RMC. Besides the obvious benefit of a perfect mix, you will also get a more efficient, fresh, and workable mix. Additionally, you only need to inform your Concrete Supplier of the specific mix design you need and the quantity. They will deliver the product to your site according to the schedule you’re following. 


The precise amount of ballast for 1m3 of concrete is paramount to get a strong and durable result. To determine the right among ballast you will need for your project, you should first consider the mix design and the end product. In addition to this, speak to professionals who can guide you to the right track. 

Whether you’re looking for advice or RMC, Pro-Mix Concrete is your solution to both. Let the experts do the calculating!