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What Most Builders Get Wrong About Concrete

Written by Lenther Nafula | Oct 17, 2026, 9:16:03 AM

Cement is usually the first element that comes to mind when thinking about concrete. However, aggregates make up the largest percentage of concrete in construction. Their greatest impact is to offer strength and durability to concrete.

Having poor-quality aggregates leads to:

  • Weak concrete strength
  • Cracking
  • Increased cement costs
  • Reduced lifespan of the structure

At Kenya Builders and Concrete Company Ltd., contractors, homeowners, and construction professionals are assured of the best, high-quality aggregates in Kenya for strong and durable concrete for their builds. Our aggregates form the structural backbone that determines the performance, durability, and longevity of buildings and infrastructure.

What Are Aggregates?

Aggregates are coarse and fine materials such as gravel, crushed stone, and sand used in making concrete. They make up 60–75% of the total volume of concrete in order to improve its strength.

Kenya Builders and Concrete Company Ltd. mines and supplies mined, crushed, and graded aggregates tailored for diverse construction needs. They include:

1. Stone Dust (0–3 mm, 0–4 mm): With ultra-smooth particles, it produces polished finishes and strong bonding in precast concrete and ready-mix concrete.

2. Graded Aggregates (10–20 mm): As a core ingredient in precast concrete and ready-mix concrete, it delivers stability and strength.

3. Double Crush Aggregates (3–6 mm, 6–10 mm, 10–14 mm & 14–20 mm): It is crushed twice for uniform shape and strength, making it perfect for asphalt concrete surface dressing and high-strength ready-mix concrete.

They help in concrete mix design optimization and saving on cement concent.

4. Washed Sand (0–2 mm): It is clean, fine sand for ready-mix concrete and plaster sand, giving smooth finishes.

5. Crusher Run (0–37.5 mm): It is a well-graded mix for sub-base and filling material, producing solid, compact foundations for roads and parking areas. 

Why Aggregates Quality Matters

Construction conditions in Kenya, such as varying soil types and weather, make material quality even more critical.

High-quality aggregates improve:

  • Strength & Load Capacity. This ensures concrete can support heavy structures.
  • Durability through resistance to weather, moisture, and wear.
  • Reduced cracking and structural failures over time.
  • Cost efficiency, as it reduces cement consumption.

Kenya Builders and Concrete Company Limited focuses on controlled production and consistency:

    • Sourced from our reliable quarries
    • Crushed and graded to standard sizes
    • Quality-controlled for strength and durability
    • Suitable for residential, commercial, and infrastructure projects

This ensures you get reliable materials every time that perform optimally in various applications like foundations, roads, drainage systems, and structures.

At Kenya Builders and Concrete Company, we acknowledge the fact that great construction requires the right materials. We are committed to produce and supply high-quality aggregates and other concrete products, guaranteeing you of building structures that are safe for one and all.

In case you have any residential, commercial or infrastructural projects, choosing the right supplier is key. Kenya Builders and Concrete Company Ltd. Is ready to partner with you for quality, dependable and cost-smart aggregates.

Request a quote today and get high-quality aggregates delivered directly to your site.

Let’s Build Together.