The Four Core Ingredients of Concrete
At its most basic level, concrete is made from four key ingredients. Each plays a vital role in determining how the concrete performs once it is mixed, placed, and cured.
1. Cement – The Binder
Cement is the ingredient that binds concrete together. It is a fine powder, typically made from limestone and clay, which reacts chemically with water in a process known as hydration. This reaction forms a paste that coats and binds the aggregates, hardening over time to create a solid, stone‑like material.
Cement is responsible for:
- Strength development
- Setting time
- Long‑term durability
Different cement types can be used depending on performance requirements such as early strength, sulphate resistance, or reduced carbon impact.
2. Aggregates – Strength and Structure
Aggregates make up the majority of a concrete mix and are divided into two categories:
Fine aggregates – usually sand
Coarse aggregates – typically gravel or crushed stone
Aggregates provide the concrete with its bulk, strength, and stability. Their size, shape, and grading directly influence workability, strength, and finish. At Procon Readymix, aggregates are carefully selected and quality‑controlled to ensure consistent performance in every load.
3. Water – Activating the Mix
Water triggers the hydration process that allows cement to harden. The water‑to‑cement ratio is one of the most critical factors in concrete performance:
Too much water can weaken the concrete
Too little water can reduce workability and proper compaction
Achieving the right balance ensures the concrete is both workable during placement and strong once cured.
4. Admixtures – Enhancing Performance
Admixtures are added in small quantities to modify the properties of concrete. They allow concrete to be tailored to specific applications or site conditions.
Common admixtures include:
Plasticisers and superplasticisers – improve workability without adding extra water
Set accelerators – speed up strength gain (useful in cold weather)
Set retarders – slow down setting time for larger pours
Air‑entraining agents – improve durability in freeze‑thaw conditions
Procon Readymix uses admixtures to fine‑tune concrete performance, ensuring it meets the exact needs of each project.
Optional Additions for Specialist Concrete
Depending on the application, additional materials may be included in the mix:
Fibres
Steel or synthetic fibres can be added to enhance:
- Crack control
- Impact resistance
- Load distribution
Fibre‑reinforced concrete is often used in slabs, floors, and industrial applications.
Supplementary Cementitious Materials (SCMs)
Materials such as ground granulated blast‑furnace slag (GGBS) or fly ash can partially replace cement. These improve durability and significantly reduce the environmental footprint of concrete.
Why Mix Design Matters
While concrete always contains the same core ingredients, the proportions and quality of those ingredients make all the difference. A foundation mix will be very different from a high‑strength structural concrete or a self‑compacting floor slab.
At Procon Readymix, every mix is designed to:
- Meet British and European standards
- Deliver consistent quality
- Perform reliably in real site conditions
Our ready‑mixed concrete is produced under strict quality controls, ensuring customers receive concrete that is ready to place and built to last.
Ready‑Mixed Concrete from Procon Readymix
Ready‑mixed concrete is batched at a controlled plant and delivered to site in the correct condition, removing the guesswork from on‑site mixing. This guarantees:
- Accurate mix proportions
- Consistent strength and durability
- Reduced waste and faster construction
Whether you’re working on a domestic extension, commercial development, or major infrastructure project, Procon Readymix supplies concrete engineered to meet your requirements.
Get in touch by messaging us or call us on 020 8451 7880
