Benefits of Concrete Mixed On Site in Bromley: Preps and Ratio of On site Concrete

Concrete is a fundamental building material used in countless construction projects, from foundations to highways and skyscrapers. In Bromley, like in many other places, concrete plays a vital role in developing infrastructure and buildings.

When it comes to sourcing concrete, one important decision that contractors and builders face is whether to have concrete mixed on-site in Bromley or to order pre-mixed concrete. Therefore, this article will explore the advantages of choosing on-site concrete mixing in Bromley.

Reasons to Choose On Site Mix Concrete

Customization and Quality Control

One of the primary benefits of having on site mix concrete is the level of customization and quality control it allows. Through on-site mixing, contractors can adjust the concrete mix to precisely match the project’s specifications and requirements. Further, the customization shows that the concrete is tailored to meet the project’s strength, durability, and workability demands.

Moreover, on-site mixing enables continuous monitoring and adjustment of the mix as needed. Contractors can make real-time modifications based on factors, for instance:

  • Weather conditions
  • Temperature
  • Humidity

Above all, they ensure that the concrete remains at optimal consistency throughout the construction process. This degree of control contributes to a higher-quality end product, reducing the likelihood of defects or performance issues.

Cost Efficiency

On-site concrete mixing can also lead to significant cost savings for construction projects in Bromley. While the initial setup cost of on-site batching plants may seem high, the long-term pros outweigh the initial investment. Besides, here is how on-site mixing can be cost-efficient:

●      Reduced Waste:

On-site mixing minimizes the risk of over-ordering concrete, a common issue when using ready-mix suppliers. Over-ordering results in unused concrete that must be disposed of, incurring additional costs. Furthermore, in this way, you only produce the amount of concrete needed for the project.

●      Elimination of Delays:

Delays in concrete delivery can be costly, leading to project setbacks and increased labor expenses. On-site mixing eliminates the need to rely on external suppliers and their schedules, confirming a steady and timely supply of concrete.

Lower Transportation Costs:

Transportation amount can be significant when ordering ready-mix concrete from suppliers outside Bromley. Moreover, on-site mixing reduces the need for long-distance transportation, saving time and money.

How to Prepare the Site for On site Concrete Mixing?

1. Site Assessment:

Begin by evaluating the site where you plan to mix and pour the concrete. This assessment should consider factors, for example:

  • The size of the project
  • Accessibility
  • Environmental conditions

Afterward, identify any potential obstacles, such as trees, utility lines, or existing structures, that might hinder concrete placement then thoroughly clean the site.

2. Grading and Compaction:

Confirm the subgrade (the natural soil or compacted fill beneath the concrete) is properly graded to achieve the desired slope or elevation. Further, compact the subgrade using a compactor or roller to achieve adequate soil compaction. As a result, proper compaction:

  • Helps prevent settlement
  • Ensures a stable base for the concrete.

3. Formwork Installation:

Install formwork, which consists of boards or panels that create the shape and dimensions of the concrete structure. Moreover, make sure the formwork is securely anchored and properly aligned.

You can use level and measuring tools to guarantee that the formwork is at the correct elevation and alignment.

4. Reinforcement Placement (if needed):

Place steel reinforcement (rebar or mesh) within the formwork according to the structural engineering plans for reinforced concrete structures. Additionally, make sure there is proper spacing and alignment of the reinforcement.

5. Vapor Barrier (if required):

In some cases, a vapor barrier may be necessary to prevent moisture from the ground from affecting the concrete. Therefore, install the vapor barrier over the compacted subgrade.

6. Logistics:

  • One must ensure that there is adequate space for concrete mixing equipment and transportation vehicles to access the site.
  • Also, plan for a clear path for concrete delivery trucks to reach the pouring location without causing damage to the site.

7. Water Supply:

Arrange for a reliable water source nearby for mixing concrete. You will need water for the concrete mix, and having it readily available is paramount.

8. Safety Measures:

  • Implement safety measures, including the use of appropriate personal protective equipment (PPE) for workers.
  • Moreover, secure the site with barriers and warning signs to prevent unauthorized intervention.

9. Environmental Considerations:

Take into account any environmental regulations or restrictions in your area. You are required to go for an appropriate disposal of any waste materials generated during site preparation.

10. Site Inspection:

You better conduct a final inspection of the site to verify that all things are following the following:

  • Project plans
  • Specifications
  • Safety guidelines

What is the Ratio for OnSite Mixing Concrete?

The ratio depends on your project, including the type of concrete needed, its intended use, and the materials available. However, a common concrete mix ratio for general construction is the 1:2:3 mix, which consists of:

  • 1 part cement
  • 2 parts sand
  • 3 parts gravel or crushed stone (also known as aggregate)
  • Water is added as needed to achieve the desired consistency

Moreover, here is how you can calculate the quantities of materials needed for a certain volume of concrete using the 1:2:3 mix ratio:

  • Determine the volume of concrete you need in cubic feet or cubic meters.
  • Now, calculate the quantities of each material based on the mix ratio. For example, if you need to make 1 cubic yard (27 cubic feet) of concrete:

Cement: 1/6 (1 part out of 6 total parts) of 27 cubic feet = 4.5 cubic feet

Sand: 2/6 (2 parts out of 6 total parts) of 27 cubic feet = 9 cubic feet

Gravel or Aggregate: 3/6 (3 parts out of 6 total parts) of 27 cubic feet = 13.5 cubic feet

*Convert the cubic feet to the units (e.g., pounds or kilograms) if needed, considering the density of each material.

  • Mix the calculated quantities of cement, sand, and gravel thoroughly, and then gradually add water while mixing until you achieve the desired consistency. Further, the amount of water can vary depending on factors such as the type of mix.

Remember that the mix ratio can be adjusted based on the demands of your project. Different mix ratios and additional additives may be needed for specialized applications, such as high-strength concrete, lightweight concrete, or decorative concrete. Always refer to project needs or consult with a structural engineer or concrete expert to determine the appropriate mix for your specific project.


In Bromley, on-site concrete mixing offers numerous advantages for construction projects. As Bromley continues to grow and develop, on-site concrete mixing stands as a valuable resource for guaranteeing the success of construction projects in the area.

Pro-mix Concrete offers premium service for concrete mixed on-site in Bromley. Our team is always available for expert advice and consultation, helping you make informed decisions about your concrete requirements.

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