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Concrete is made by combining cementitious material, water, fine aggregate such as sand, and coarse aggregate such as gravel or crushed stone. The cement and water react to form a paste that coats and binds the aggregate; the fresh mixture is then placed, consolidated, finished, and protected while it cures. In other words, cement is an ingredient, while concrete is the composite material. The exact recipe is a project-specific mix design, not a single cement-to-sand ratio that works for every driveway, footing, pavement, or building member.
What is concrete made of?
Concrete is a composite of a hydraulic binder, water, aggregate, air, and—when specified—additional cementitious materials or chemical admixtures. The binder reacts with water in a process called hydration. That reaction creates the paste that locks the aggregate into a stone-like mass as the concrete gains strength.
Aggregate supplies most of the concrete’s volume. The WAQTC Concrete Basics workbook reports that aggregate commonly occupies 60–75% of concrete volume. The Federal Highway Administration’s pavement-concrete guidance gives a similar range by volume (60–75%) and says aggregate represents about 80–85% by mass in the pavement concrete it discusses. Those percentages use different measurement bases, so they should not be mixed or treated as a universal batch formula.
The main ingredients and their jobs
| Ingredient | What it does | Typical examples or notes |
|---|---|---|
| Cementitious binder | Reacts with water to form paste and bind the aggregate. | Portland cement or blended cement; supplementary cementitious materials may replace part of the cement. |
| Water | Supplies the water needed for hydration and gives the fresh mix workable consistency. | Quantity and cleanliness matter; impurities can affect setting, strength, reinforcement corrosion, or durability. |
| Fine aggregate | Fills spaces between larger particles and contributes to the grading and workability of the mix. | Usually natural sand or manufactured sand. |
| Coarse aggregate | Provides most of the rigid particle framework and limits paste demand. | Usually gravel or crushed stone; size and grading must suit the member and placement method. |
| Air | Small voids remain after mixing; intentionally entrained microscopic bubbles can improve freeze-thaw resistance. | WAQTC gives broad explanatory values of about 0.5–2% for non-air-entrained concrete and 4–8% when air is intentionally entrained. |
| Optional additions | Adjust fresh behavior, setting, strength development, durability, or other specified properties. | Fly ash, ground slag, silica fume, water reducers, retarders, accelerators, air entrainers, and fibers are mix-design choices. |
The National Ready Mixed Concrete Association describes typical concrete by volume as approximately 10–15% cement, 60–75% aggregate, and 15–20% water, with air potentially contributing another 5–8%. These are typical ranges, not endpoints that should simply be added together for a universal recipe. The association emphasizes that strong, durable concrete depends on careful proportioning and mixing of the ingredients.
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What is the difference between cement and concrete?
Cement is the powdered hydraulic binder; concrete is the finished composite made with cement, water, fine aggregate, coarse aggregate, air, and sometimes other materials. Calling a sidewalk “cement” is common in casual speech, but technically the sidewalk is concrete.
Portland cement is manufactured before it reaches a concrete batch plant. Raw materials are processed in a kiln to make clinker, and the clinker is ground with gypsum and other materials to produce cement. Concrete producers then combine that cementitious material with water and aggregate. The American Cement Association’s cement and concrete FAQ explains this distinction and the role of hydration.
How are concrete proportions chosen?
A mix is proportioned to meet both fresh-concrete needs and hardened-performance requirements. Designers consider the required workability, member thickness, reinforcement congestion, aggregate grading, exposure to weather or chemicals, placement equipment, strength, durability, and the project’s specifications.
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There is therefore no responsible universal instruction such as “one part cement, two parts sand, and three parts gravel” for structural work. A small nonstructural repair, a reinforced beam, and a freeze-thaw-exposed pavement have different requirements. Use the project specification or a qualified mix designer when the concrete is load-bearing, reinforced, exposed to severe conditions, or subject to code acceptance.
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How is cement made before it becomes concrete?
Cement production and concrete production are separate stages. Cement plants heat selected mineral raw materials in a kiln until they form clinker. The clinker is cooled and ground with gypsum and, for blended cements, other approved materials. The resulting fine powder is the cementitious binder delivered to a concrete producer. Once water is added to that powder, hydration begins and the binder develops the paste that holds aggregate together.
How is concrete mixed and delivered?
Concrete ingredients are measured, or batched, and mixed until the cement paste is distributed through the aggregate with a uniform consistency. Ready-mix producers use three common arrangements:
- Truck-mixed: the ingredients are loaded into a rotating truck drum and mixed in the truck.
- Shrink-mixed: the batch is partly mixed at a stationary plant and completed in the delivery truck.
- Central-mixed: the concrete is fully mixed in a stationary plant mixer before being transferred for delivery.
The American Cement Association notes that the batch can be tailored to the contractor’s stated requirements. The best arrangement depends on quantity, haul and site-access conditions, placement timing, available equipment, and the project’s specifications—not on a universal ranking of the three methods.
For drum mixers, the USDA Natural Resources Conservation Service handbook gives sequence guidance that generally puts most of the water and all coarse aggregate in first, followed by the remaining ingredients. That is technical process guidance, not a casual DIY formula. Chemical admixtures must be dosed and introduced in a controlled sequence compatible with the mix.
What happens after mixing?
Fresh concrete is plastic only for a limited period, so the crew plans transport and placement before it becomes too stiff. Concrete may be discharged into formwork, pumped, conveyed, or otherwise moved using equipment suited to the site. Forms define the intended shape and contain the fresh material while it is consolidated.
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1. Place the concrete
Placement should avoid unnecessary segregation, in which coarse particles separate from the mortar. The delivery method, drop height, layer thickness, reinforcement layout, and access all influence how the concrete is placed. The mix must remain workable enough to reach the required locations without unauthorized water addition.
2. Consolidate it
Consolidation removes or reduces trapped voids and helps the concrete flow around reinforcement and into corners. Internal or external vibration is commonly used, while small batches may receive other specified consolidation methods. Too little consolidation can leave honeycombing and pockets; excessive vibration can allow the mixture to segregate. The method and duration depend on the mix, reinforcement, formwork, and equipment.
3. Finish the surface
Finishing is performed while the concrete remains workable. Screeding establishes level, and subsequent operations create the specified texture or smoothness. Finishing too early or working bleed water into the surface can damage the intended surface properties, so crews follow the project’s placement and finishing requirements rather than a fixed clock.
What does curing do?
Curing is not simply letting concrete dry. It protects the placed concrete from premature moisture loss and harmful temperature changes so cement hydration can continue. As hydration proceeds, the paste develops the hardened structure that gives concrete its strength and durability. The American Cement Association explains that curing ensures continued hydration and continued strength gain after placing.
Curing begins after the surface can resist marring. The selected method may include maintaining moisture, limiting evaporation with curing compounds or coverings, and controlling temperature. The appropriate duration and method vary with cement type, admixtures, member size, weather, exposure, and the specified performance. A single number of days is therefore not a universal answer for every placement.
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Premature drying can leave the surface underdeveloped even when the interior is stronger. Hot, dry, windy conditions accelerate evaporation; cold conditions can slow hydration or damage young concrete if temperatures are not controlled. Project documents normally specify curing procedures, protection, and acceptance criteria.
Can you make concrete yourself on a small project?
Small batches can be mixed with a portable concrete mixer when the quantity, access, and required properties make self-batching practical. You still need accurately measured ingredients, clean and suitable aggregate, an appropriate water supply, safe electrical or fuel arrangements, formwork, placement help, and a curing plan. A mixer does not replace proportioning: the batch must be designed for the intended use.
- Define the job. Identify whether the work is decorative, nonstructural, reinforced, load-bearing, or exposed to freezing, chemicals, or heavy traffic.
- Obtain the required mix information. Use the project specification or professional guidance for strength, exposure class, aggregate size, air content, and admixtures.
- Measure every component. Keep the water amount under control and account for moisture in sand and coarse aggregate.
- Mix to a uniform consistency. Follow the mixer and admixture instructions; do not improvise chemical dosage or sequence.
- Place, consolidate, and finish promptly. Arrange enough labor and equipment so the batch does not sit while becoming unworkable.
- Protect and cure. Prevent premature drying and temperature damage according to the specified procedure.
For structural slabs, foundations, columns, retaining walls, or large placements, ready-mix supplied to an approved design is generally more practical than trying to reproduce a controlled production process with improvised measurements.
What can go wrong when concrete is made?
- Too much water: It increases workability temporarily but changes the water-cement ratio and can reduce the specified performance.
- Poor aggregate grading or dirty aggregate: Excess voids or contamination can increase paste demand and interfere with bonding or durability.
- Incorrect air content: Air-entrained and non-air-entrained mixes serve different purposes; the broad WAQTC ranges are explanatory, not a substitute for the project target.
- Insufficient consolidation: Voids and incomplete filling around reinforcement can remain in the hardened concrete.
- Over-vibration: Prolonged or inappropriate vibration can promote segregation.
- Finishing at the wrong time: Working the surface before it is ready can trap bleed water or weaken the surface.
- Inadequate curing: Rapid moisture loss or damaging temperatures interrupt the conditions needed for continued hydration.
- Uncontrolled admixture use: Retarders, accelerators, water reducers, air entrainers, fibers, and supplementary cementitious materials must be compatible with the specified mix.
How should you think about the finished material?
Concrete performance comes from the whole system: binder chemistry, water content, aggregate quality and grading, air structure, mixing uniformity, placement, consolidation, finishing, and curing. A strong result cannot be rescued by one ingredient alone. The same cement can produce different concrete when the water-cement ratio, aggregate, admixtures, air content, curing environment, or placement method changes.
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Frequently Asked Questions
Can I use tap water to make concrete?
Often, potable water is suitable, and the NRMCA notes that many drinkable natural waters can be used. Water with excessive impurities may alter setting or strength, promote reinforcement corrosion, or reduce durability, so questionable sources should be evaluated against the project requirements rather than assumed safe.
Why is air added to some concrete mixes?
Air-entraining admixtures create a controlled system of microscopic bubbles. That system is commonly specified where resistance to freezing and thawing is important, but the target air content remains a mix-design requirement and is not interchangeable with accidental air trapped during poor mixing.
Does concrete get stronger forever after it is placed?
Hydration can continue as long as suitable moisture and temperature conditions remain, so concrete generally gains strength beyond initial placement. The rate and amount of later gain depend on the cementitious materials, water availability, temperature, curing, and the specified test age; no single age describes every mix.
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Is ready-mix concrete always better than mixing on site?
Neither route is universally best. Ready-mix offers a batch tailored to project requirements and may be practical for larger or structural work, while a portable mixer can suit small quantities with good access and appropriate controls. Quantity, delivery time, site logistics, and the required specification determine the sensible choice.
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