Ready mix concrete is pre-batched at a central plant according to precise specifications. It is delivered to construction sites fresh and workable, ready for immediate placement. This factory-controlled process ensures consistent quality, accurate mix proportions, and reliable strength for every load.
The main types include transit-mixed, central-mixed, and shrink-mixed concrete. There are also performance variants such as standard, high-strength, fibre-reinforced, self-compacting, and rapid-setting mixes. Knowing the different types of ready mix concrete helps contractors, builders, and homeowners choose the right product for their project, whether it’s a garden path or a multi-storey building.
Ready-mix concrete represents a fundamental shift from traditional on-site mixing methods. Instead of combining raw materials at the construction location, this approach centralises production at specialised batching facilities where every aspect of the mix can be monitored and controlled.
Ready-mix concrete refers to concrete manufactured in a factory or batching plant according to a set recipe and then delivered to the job site by truck in a plastic, unhardened state.
The concrete arrives ready for placement without any additional mixing or preparation required on-site. This definition distinguishes it from site-mixed concrete, where raw materials are combined manually or mechanically at the construction location.
The differences between ready-mix and site mixed concrete extend far beyond simple convenience.
| Factor | Ready-Mix Concrete | Site-Mixed Concrete |
| Quality Control | Factory-controlled, consistent | Variable, operator-dependent |
| Mix Accuracy | Computer-batched precision | Manual measurement |
| Labour Required | Minimal on-site mixing labour | Significant mixing of labour |
| Equipment Needed | Delivery truck only | Mixers, storage, measuring |
| Material Wastage | Low (precise quantities) | Higher (over-ordering common) |
| Speed | Fast placement | Slower batch-by-batch |
Did you know?
Site-mixed concrete can vary by up to 15% in strength from batch to batch, while factory-batched ready-mix typically maintains consistency within 5% of target strength.
Every concrete mix consists of four primary components combined in specific proportions to achieve desired performance characteristics.
Core ingredients include:
Pro Tip:
The water-to-cement ratio is the single most important factor affecting concrete strength. Lower ratios produce stronger concrete but reduce workability, so admixtures often compensate to maintain both properties.
The production and delivery process involves carefully orchestrated steps, ensuring concrete arrives at your site in optimal condition for placement.
Modern batching plants use computerised systems to measure and combine materials with exceptional precision.
Quality control measures include:
These plants can produce hundreds of cubic metres daily while maintaining consistent quality across every batch.
Once batched, concrete transfers to specially designed truck mixers for delivery to construction sites.
The transport process involves:
The clock starts ticking once concrete leaves the plant, making efficient site preparation essential.
| Stage | Typical Time Frame | Key Considerations |
| Transport | 30-90 minutes | Distance, traffic, weather |
| Workability Window | 60-90 minutes | Temperature, admixtures used |
| Initial Set | 30-45 minutes after placement | No further working possible |
| Final Set | 6-10 hours | Light foot traffic may be possible |
| Full Cure | 28 days | Full design strength achieved |
The method used to mix concrete significantly affects its properties upon arrival at your site. Three primary approaches exist, each suited to different project requirements and delivery distances.
Transit-mixed concrete involves loading dry or partially mixed materials into the truck mixer at the plant, with mixing occurring during transport.
Characteristics of transit-mixed concrete:
This approach offers flexibility because the mixing process can be timed to arrive at optimal consistency regardless of traffic delays.
Central-mixed concrete undergoes complete mixing at the batching plant before loading into the truck for delivery.
Key features include:
The more thorough mixing at the plant typically produces slightly more consistent results than transit mixing.
Shrink-mixed concrete represents a hybrid approach combining elements of both central and transit mixing methods.
The shrink-mix process involves:
Selecting the appropriate mixing method depends on your project’s specific circumstances.
| Mixing Method | Best For | Distance | Quality Priority |
| Transit-Mixed | Standard projects, longer hauls | Up to 90 minutes | Good |
| Central-Mixed | Critical applications, short distances | Under 30 minutes | Excellent |
| Shrink-Mixed | Medium distances, balanced needs | 30-60 minutes | Very Good |
Pro Tip:
For projects requiring C35 concrete or higher-strength mixes, central-mixed or shrink-mixed methods often produce more consistent results due to the controlled plant environment.
Beyond mixing methods, ready-mix concrete comes in numerous performance variants designed for specific applications and conditions.
Standard ready-mix serves the majority of construction applications where no special performance requirements exist.
Common applications include:
This versatile option covers grades from C10 through C25, suitable for most residential and light commercial work.
High-strength mixes exceed 40 N/mm² compressive strength, enabling the construction of demanding structural elements.
Typical uses for high-strength mixes:
Did you know?
Ultra-high-performance concrete can achieve compressive strengths exceeding 150 N/mm², nearly ten times stronger than standard domestic mixes.
Fibre-reinforced concrete incorporates steel, glass, synthetic, or natural fibres throughout the mix to enhance specific properties.
Benefits of fibre reinforcement:
This type proves particularly valuable for industrial floors, pavements, and shotcrete applications.
Self-compacting concrete flows and consolidates under its own weight without requiring mechanical vibration.
Advantages of SCC include:
Adjusting aggregate types produces concrete with significantly different densities for specialised applications.
| Type | Typical Density | Applications |
| Lightweight | 1,400-1,800 kg/m³ | Upper floors, roof decks, thermal insulation |
| Normal | 2,300-2,400 kg/m³ | Standard construction |
| High-Density | 2,600-6,000 kg/m³ | Radiation shielding, ballast, counterweights |
Lightweight variants use expanded clay, shale, or pumice aggregates, while high-density mixes incorporate materials like barytes or magnetite.
When project timelines demand fast turnaround, rapid-setting mixes achieve working strength in hours rather than days.
Applications for rapid-setting concrete:
Modern batching technology enables the creation of bespoke mixes tailored to unique project requirements.
Speciality options include:
Concrete grades indicate the characteristic compressive strength achieved after 28 days of curing, providing a standardised system for specifying requirements.
The grading system uses letters and numbers to denote strength class and specific properties.
| Grade Range | Strength (N/mm²) | Category |
| C10-C15 | 10-15 | Ordinary/Gen |
| C20-C25 | 20-25 | Standard |
| C30-C35 | 30-35 | Standard to High |
| C40-C50 | 40-50 | High Strength |
| C55-C60+ | 55-60+ | Very High Strength |
Lower-grade mixes serve applications where structural loading remains minimal.
C10 and C15 uses:
These economical options provide adequate performance without over-specifying for simple applications.
Mid-range grades form the backbone of most construction projects.
C20 through C30 applications:
C35 concrete represents a popular choice for projects requiring enhanced strength without speciality mix requirements, offering excellent durability for demanding applications.
Projects involving significant structural loads or challenging conditions demand premium-grade concrete.
C40 and above applications:
For critical infrastructure projects, these high-performance mixes deliver the strength and durability essential for long service life.
The widespread adoption of ready-mix concrete reflects numerous benefits over traditional site-mixing approaches.
Factory production eliminates the variability inherent in manual mixing processes.
Quality advantages include:
Ready-mix dramatically accelerates construction schedules compared to site mixing.
Time benefits include:
Centralised production transfers much of the work away from the construction site.
Labour and wastage benefits:
Ready-mix production offers environmental advantages over traditional methods.
Sustainability factors:
Did you know? Modern batching plants can reclaim wash water and return concrete, with aggregates recycled into new mixes and water reused in production.
Selecting appropriate concrete involves matching technical requirements with practical project constraints.
Different structural applications demand specific performance characteristics.
Structural matching considerations:
Pro Tip: Always consult your structural engineer’s specifications before ordering. Under-specifying risks structural failure, while over-specifying wastes resources unnecessarily.
Environmental conditions significantly influence appropriate mix selection.
| Exposure Class | Conditions | Mix Requirements |
| XC1 | Dry or permanently wet | Standard mixes suitable |
| XC3/XC4 | Moderate humidity, wetting/drying | Enhanced cement content |
| XD | De-icing salts | Chloride-resistant mixes |
| XS | Marine | Sulphate-resistant cement |
| XF | Freeze-thaw | Air-entrained mixes |
Durability factors to consider:
Experienced suppliers provide valuable guidance for complex projects.
Supplier collaboration benefits:
For projects requiring pumped placement, Concrete Pump Hire services combined with appropriately designed mixes ensure efficient delivery to difficult access areas.
Ready mix concrete has changed construction by providing factory-controlled quality, consistent strength, and efficient placement directly to job sites. Its versatility suits everything from domestic foundations to high-performance structural elements. Different mixing methods, performance variants, and grades ensure there’s a suitable product for nearly every construction need.
For projects across London and the surrounding areas, Pro-Mix Concrete delivers reliable ready mix concrete with over 20 years of experience. Their services include Ready Mix Concrete, Mix On Site Concrete, and Concrete Pump Hire, supporting domestic extensions and large commercial developments alike. Same-day and next-day delivery, computer-controlled batching, and a team of certified experts ensure each pour meets exact project requirements. Their concrete grades range from C10 for general use to C35 and higher-strength options for demanding structural applications.
What is ready-mix concrete?
Ready-mix concrete is factory-batched concrete made to a specified mix design at a central plant and delivered to the job site in a truck ready to place. This approach ensures consistent quality, precise proportions, and reliable strength compared to traditional site-mixing methods.
What are the main types of ready-mix concrete?
The main types are transit-mixed, central-mixed, and shrink-mixed concrete, with additional variants such as standard, high-strength, lightweight, fibre-reinforced, self-compacting, and rapid-setting mixes. Each type serves specific applications and performance requirements.
How do I choose the right type of ready-mix concrete for my project?
Choose a ready-mix type based on the structural load, exposure conditions, required strength, placement method, and your engineer’s or supplier’s recommendations for that specific application. Consulting with experienced suppliers helps ensure appropriate specifications.
Is ready-mix concrete better than site-mixed concrete?
Ready-mix concrete is generally better for most projects because it offers more consistent quality, stronger control over mix design, less on-site labour, and faster placement than site-mixed concrete. However, site mixing may suit very small quantities or remote locations.
Can ready-mix concrete be customised for different uses?
Yes, ready-mix concrete can be customised by adjusting the cement content, aggregate grading, water content, and admixtures to create mixes tailored for uses like high-strength structural work, slabs, floors, or fast-track repairs. Modern batching technology enables virtually unlimited customisation possibilities.
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