What is Ready-Mix Concrete?

Quick Answer: Ready-mix concrete is pre-batched at a central plant and delivered by truck to your site, typically costing $150–$200 per cubic yard plus delivery. It's the industry standard for residential driveways, patios, and slabs because it ensures consistent strength (usually 4,000 PSI) and faster placement than site-mixed alternatives.

Ready-mix concrete is the backbone of modern construction across North Carolina and nationwide. Whether you're planning a driveway in Charlotte, a patio in Raleigh, or a foundation in the Lake Norman area, understanding how ready-mix works—and why it matters—will help you make smarter project decisions. Local Concrete Contractor is a North Carolina–based concrete company in business 15 years, with hundreds of 5-star Google reviews across Charlotte, Raleigh, the Triad, and the Lake Norman area. We specialize in ready-mix concrete projects from residential sidewalks to large commercial slabs, and we operate on a pay-on-completion model: you pay nothing until the work is finished, and we fund all materials and labor upfront. This post explains what ready-mix concrete is, how it differs from site-mixed alternatives, what it costs, and why it's the right choice for most homeowners.

Local Concrete Contractor is a North Carolina concrete company in business 15 years, with hundreds of 5-star Google reviews across Charlotte, Raleigh, the Triad, and the Lake Norman area. The company specializes in ready-mix concrete projects ranging from residential driveways to large commercial slabs, using precision mix designs tailored to soil conditions and climate across North Carolina. Ready-mix concrete typically costs $150–$200 per cubic yard for standard 4,000 PSI mixes, delivered and placed on-site within 90 minutes of batching. Unlike most contractors, Local Concrete operates on a pay-on-completion model: homeowners fund nothing until work is finished, and Local Concrete covers all materials and labor upfront. This eliminates the deposit-and-disappear risk that defines poor concrete contracting in the region.

What is ready-mix concrete?

Ready-mix concrete is concrete that is batched (mixed) at a central plant and then transported to the job site in a rotating concrete mixer truck. The truck arrives at your property with the concrete in a plastic state, ready to pour directly into forms. This differs fundamentally from site-mixed concrete, which is batched and mixed on-site using smaller equipment.

The ready-mix system ensures precision and consistency. At the batching plant, technicians measure Portland cement, aggregate (sand and gravel), water, and any admixtures according to a certified mix design. This design specifies exact proportions to achieve target strength, workability, and durability for your project. The truck mixer keeps the concrete in motion during transport, preventing separation and maintaining homogeneity.

Ready-mix is the industry standard because it meets ASTM International C94 specifications for concrete quality, consistency, and testing protocols. Residential driveways, patios, sidewalks, pool decks, and commercial slabs across Charlotte, Raleigh, Winston-Salem, and beyond rely on ready-mix concrete for guaranteed strength and durability.

How ready-mix concrete is made

Ready-mix concrete production begins at the batching plant with four primary components: Portland cement, fine aggregate (sand), coarse aggregate (gravel), and water. The plant also stockpiles optional admixtures like air-entraining agents, plasticizers, retarders, and fly ash.

The batching process follows these steps:

Design verification: The plant manager confirms the mix design (e.g., 4,000 PSI with air entrainment for a North Carolina driveway subject to freeze-thaw cycles).
Material loading: Weigh hoppers automatically dispense Portland cement (typically 470–600 pounds per cubic yard), fine aggregate, and coarse aggregate into a mixer drum.
Water addition and mixing: Water is added to reach the target water-cement ratio (usually 0.45–0.55 for durable concrete). The drum rotates for 60–90 seconds to blend all components uniformly.
Quality control testing: The plant tests slump (workability), temperature, and air content per Portland Cement Association standards. Slump for typical driveways is 4–5 inches.
Truck loading: Approved concrete is loaded into the rotating mixer truck. The truck operator receives a ticket specifying mix design, batch time, and delivery deadline.
Transport: The concrete must reach your site and be placed within 90 minutes of batching. The truck's rotating drum keeps concrete workable and prevents separation.

According to the National Ready Mixed Concrete Association, modern batching plants in North Carolina use computerized controls to ensure that each cubic yard meets design specifications within ±3% accuracy for cement content and ±2% for aggregate gradation. This precision is impossible with site-mixed concrete.

Strength and specifications

Concrete strength is measured in PSI (pounds per square inch) based on compressive strength testing at 28 days per ASTM C39 standards. The 28-day strength represents the design strength—the target you specify when ordering.

Common strength grades for residential and commercial projects:

3,000 PSI: Lightly loaded patios, sidewalks, and decorative slabs in protected areas.
4,000 PSI: Standard driveways, moderate-traffic slabs, and typical residential work. This is the most common specification in North Carolina.
5,000 PSI: Heavy-traffic driveways, commercial slabs, warehouse floors, and areas subject to freeze-thaw cycling.
6,000 PSI+: Industrial floors, structural slabs, and applications requiring exceptional durability.

Strength depends on the water-cement ratio. Lower ratios (0.40–0.45) produce stronger, more durable concrete; higher ratios (0.55–0.65) improve workability but reduce long-term durability. For North Carolina's climate—with seasonal freeze-thaw cycles, humidity, and occasional heavy rain—a 4,000 PSI mix with air entrainment (4–8% entrained air) is ideal for driveways and patios.

Air entrainment is critical in freeze-thaw climates. When concrete freezes, water in the pores expands. Air-entrained concrete contains tiny, evenly spaced air bubbles that absorb this expansion, preventing spalling and scaling. NC State Extension recommends air entrainment for all outdoor concrete in the Piedmont and Mountain regions.

Costs and pricing

Ready-mix concrete pricing varies by location, mix design, and market conditions. Here is a typical breakdown for North Carolina projects:

Concrete Type	Cost per Cubic Yard	Typical Use
Standard 4,000 PSI	$150–$180	Driveways, patios, sidewalks
4,000 PSI with air entrainment	$160–$200	Freeze-thaw climate driveways
5,000 PSI (heavy-duty)	$170–$210	Commercial, heavy-traffic slabs
Stamped or colored	$180–$260	Decorative driveways, patios
Exposed aggregate	$190–$280	Decorative pool decks, patios

Additional costs to budget for:

Delivery fee: $75–$150 per truck, depending on distance from the plant. Plants in Charlotte, Raleigh, Winston-Salem, and Greensboro typically charge less for local jobs.
Minimum order: Most plants require 4–5 cubic yards per truck. A typical driveway (16 × 24 feet, 4 inches thick) requires 4.7 cubic yards.
Finishing labor: Broom finish, trowel finish, or stamped finishes add $1–$3 per square foot in labor.
Subgrade prep: Excavation, gravel base, and compaction typically cost $2–$5 per square foot.
Reinforcement: Wire mesh or rebar costs $0.50–$1.50 per square foot, depending on specification.

Example project cost: A 400-square-foot driveway (16 × 25 feet, 4 inches thick) requires 4.9 cubic yards of 4,000 PSI concrete. At $165 per cubic yard, the material cost is $809. Delivery ($100), subgrade prep ($1,000–$1,500), finishing labor ($1,200–$1,600), and reinforcement ($200) bring the total to approximately $3,300–$4,200. This assumes pay-on-completion pricing with no deposit or financing charges—the model Local Concrete uses across North Carolina.

Ready-mix vs. site-mix concrete

Site-mixed concrete is rarely used for residential work today, but understanding the differences illustrates why ready-mix dominates the market.

Ready-mix advantages:

Precision and quality control: Factory batching under computer control meets ASTM standards. Every cubic yard is consistent.
Speed: A truck delivers concrete to your site in a ready-to-pour state. Placement takes hours, not days.
Reliability: Tested mix designs guarantee 28-day strength. Site-mixed concrete has higher failure risk.
Scalability: Large slabs (2,000+ square feet) are practical only with ready-mix.
Regulatory compliance: Licensed batching plants are inspected and certified. Site-mix contractors often lack oversight.

Site-mix disadvantages:

Inconsistency: Hand-measured cement, sand, and gravel introduce variability. Strength can be 10–20% below design in poor batches.
Slow placement: A drum mixer (typically 9 cubic yards maximum) takes 5–10 minutes to batch and discharge. Large slabs require many batches, increasing joint risk and surface defects.
Weather vulnerability: Site-mixed concrete is exposed to temperature and humidity variations during batching and placement.
Labor-intensive: Site-mix requires on-site equipment, operators, and cleanup. Ready-mix reduces crew size and project duration.

For patios and slabs, driveways, and other residential work in Charlotte, Raleigh, and throughout North Carolina, ready-mix is the only practical choice. Site-mix is occasionally used for very small repairs or remote commercial work, but it carries significant risk.

Placement and curing

Successful ready-mix concrete starts with proper subgrade preparation and continues through the critical curing period.

Placement process:

When the concrete truck arrives on-site, the chute is positioned over the forms. Concrete is discharged onto the slab, then spread and leveled using shovels, rakes, and a strike board (or screed board). Screeding removes excess concrete and creates a relatively level surface. For a 400-square-foot driveway, placement typically takes 2–4 hours depending on access and site conditions.

Proper placement requires experienced crews. Poor screeding, over-vibration, or finishing too early traps bleed water and air voids beneath the surface, leading to scaling, spalling, and rapid deterioration in freeze-thaw climates. Good finishing practice is as important as the concrete itself.

Curing timeline and requirements:

Curing is the process of maintaining moisture and temperature in freshly placed concrete so that Portland cement hydration continues. Proper curing is non-negotiable for durability:

Days 0–1: Concrete reaches initial set (hardening begins). Do not disturb or traffic the slab.
Days 1–7: Critical hydration period. Keep the surface moist using tarps, sprinklers, or curing compound. Concrete reaches approximately 70% design strength at 7 days.
Days 7–28: Continue moisture retention if possible. Concrete gains full 28-day strength gradually. Avoid heavy loads and vehicle traffic for at least 5–7 days.
After 28 days: Concrete is fully cured and ready for normal use. Strength may continue to gain slightly for months or years.

In North Carolina's climate, where temperature and humidity vary seasonally, curing discipline directly affects longevity. Cold-weather curing (below 50°F) slows hydration dramatically. Contractors use heated water, insulating blankets, and extended curing schedules to maintain concrete temperature above 50°F for at least 7 days in winter.

Rapid drying—common in hot, windy conditions—causes shrinkage cracking. Moisture-retaining tarps and frequent misting prevent this. The Portland Cement Association recommends 7 days of continuous moisture retention for all outdoor concrete in North Carolina, extending to 10–14 days in freeze-thaw zones like the Piedmont and Mountains.

Common problems and solutions

Ready-mix concrete is durable when specified, placed, and cured correctly. However, poor execution creates predictable failures.

Crazing (fine surface cracks): Hairline cracks form in a random pattern on the surface. Cause: rapid surface drying while concrete is still hydrating. Solution: extended moisture retention (misting and tarps for 7 days) prevents most crazing. Choosing a contractor who prioritizes proper curing methods is essential.

Spalling (surface breakdown): Chunks of concrete break away, especially at edges and corners. Cause: freeze-thaw cycling in non-air-entrained concrete. Air-entrained concrete (4–8% entrained air) survives freeze-thaw because air bubbles absorb water expansion. Always specify air entrainment for North Carolina driveways.

Scaling (surface layer peeling): The top 1/4–1/2 inch of concrete flakes off in winter. Cause: de-icing salts combined with freeze-thaw cycles in concrete lacking air entrainment or durable finishing. Solution: air entrainment + low water-cement ratio (0.45 or less) + no salt application in the first year.

Settlement and differential cracking: Slab settles unevenly, causing diagonal cracks. Cause: poor subgrade preparation, inadequate compaction, or expansive clay soils. North Carolina's clay-heavy soils are prone to settlement if not properly prepared. Solution: excavate 6–8 inches, add 4–6 inches of compacted gravel base, and achieve 95% standard Proctor density via plate compaction.

Alkali-silica reaction (ASR): Reactive silicates in aggregate react with alkali in Portland cement, creating internal stress and map cracking. Rare but possible with low-quality aggregate. Solution: specify low-alkali cement and test aggregate sources per ASTM C1260 standards.

Efflorescence (white powder on surface): Salts leach to the surface and crystallize. Cause: excess water in concrete or through-pores created by poor curing. Solution: proper low water-cement ratio (0.45–0.50) and rigorous 7-day curing prevent efflorescence in most cases.

The best defense against all these problems is selecting a contractor with proven experience, full licensing and insurance, and a commitment to quality subgrade prep, mix design, placement, and curing. Local Concrete's hundreds of 5-star reviews reflect 15 years of consistent execution across Charlotte, Raleigh, Winston-Salem, and Greensboro.

Frequently asked questions

How long does ready-mix concrete last?

Properly placed and cured ready-mix concrete typically lasts 25–40 years for residential driveways and patios. Lifespan depends on mix design, finishing quality, curing time (minimum 7 days), and climate exposure. In North Carolina's freeze-thaw cycles, air-entrained mixes (containing 4–8% entrained air) significantly extend durability by preventing spalling and scaling.

What is the difference between ready-mix and site-mix concrete?

Ready-mix concrete is batched at a central plant and delivered in a concrete truck, ensuring consistent quality and precise mix ratios. Site-mix (or barrel-mix) is mixed on-site in a drum mixer, which is slower, less consistent, and rarely used for residential work. Ready-mix is the industry standard because it meets ASTM C94 specifications and delivers superior strength and durability.

Can ready-mix concrete be used in winter?

Yes, ready-mix concrete can be placed in winter with proper precautions. Concrete must cure at least 7 days before freezing occurs; below 50°F, curing slows dramatically. Many contractors in North Carolina use heated water, air-entrained admixtures, and insulated blankets to maintain curing temperatures during cold months.

How much does ready-mix concrete cost per cubic yard?

Ready-mix concrete costs $150–$200 per cubic yard for standard 4,000 PSI mixes in North Carolina, plus delivery fees ($75–$150 depending on distance). Decorative mixes (stamped, colored, or exposed aggregate) cost 15–30% more. Total project cost depends on slab thickness, site access, and finishing complexity.

What is the minimum order for a concrete truck?

Most ready-mix plants require a minimum order of 4–5 cubic yards per truck. A typical driveway (16 × 24 feet, 4 inches thick) requires about 4.7 cubic yards. For smaller projects, contractors may recommend pavers or stamped concrete alternatives, or combine orders with neighboring jobs.

How is ready-mix concrete strength measured?

Concrete strength is measured in PSI (pounds per square inch) determined by a 28-day compressive strength test per ASTM C39. Residential driveways typically use 4,000 PSI; commercial and heavy-traffic areas use 5,000–6,000 PSI. Strength depends on water-cement ratio, curing conditions, and aggregate quality.

What causes concrete to crack after delivery?

Cracks in freshly placed concrete usually result from rapid drying, improper finishing, poor subgrade preparation, or thermal stress. Control joints (spaced 4–6 feet apart) and proper curing techniques prevent 80% of shrinkage cracks. According to the Portland Cement Association, concrete should cure for at least 7 days with moisture retained to achieve design strength.

Is ready-mix concrete environmentally friendly?

Modern ready-mix concrete can incorporate 20–35% recycled fly ash or slag, reducing Portland cement content and carbon footprint by up to 25%. The National Ready Mixed Concrete Association reports that properly finished concrete pavements are recyclable and produce zero VOCs during installation. Choose a contractor certified in sustainable practices.

Key takeaways

Ready-mix concrete is batched at a certified plant and delivered by truck, guaranteeing consistent strength (typically 4,000 PSI for driveways) and quality control per ASTM C94 standards.
Cost ranges from $150–$200 per cubic yard for standard mixes, plus $75–$150 delivery; total project cost for a 400-square-foot driveway is typically $3,300–$4,200 including labor and subgrade prep.
Air entrainment (4–8% entrained air) is essential for North Carolina's freeze-thaw climate to prevent spalling and scaling—a non-negotiable specification for outdoor concrete.
Proper curing for 7–14 days with moisture retention, combined with well-prepared subgrades and experienced finishing crews, ensures 25–40 year durability in residential applications.
Ready-mix is faster, more reliable, and more affordable than site-mixed alternatives, making it the industry standard for driveways, patios, sidewalks, and commercial slabs across North Carolina.
Common failures like crazing, spalling, and settlement result from poor subgrade prep, rapid drying, or low-quality mix design—all preventable with a licensed, experienced contractor.

Ready to get started? Pay nothing until the work is complete. Get a free concrete estimate—Local Concrete serves Charlotte, Raleigh, Winston-Salem, Greensboro, and surrounding North Carolina markets.