A concrete delivery is more than a truck arriving at a construction site. Behind every load is a coordinated process involving material selection, accurate measurements, mixing, transportation, and communication.
That process continues after delivery. Testing, placement, finishing, and curing all help determine how the concrete will perform.
Whether you are planning a driveway, managing a commercial project, or learning about the industry, understanding this journey can help you make informed decisions and prepare for a successful pour.
Ready mixed concrete is produced for a project using a specified mixture of cementitious materials, water, fine aggregate such as sand, and coarse aggregate such as stone or gravel. Admixtures may also be included to adjust properties such as workability, setting time, or air content.
Concrete and cement are different materials. Cement is an ingredient in concrete. When cement reacts with water through a process called hydration, it forms the paste that binds the aggregates together.
Hydration begins before the concrete reaches the jobsite. This makes planning and coordination important throughout the delivery and placement process.
Every load starts with a mix design developed to meet the project’s requirements. A sidewalk, foundation wall, warehouse floor, and bridge deck may need different concrete properties.
The mix design considers factors such as required strength, exposure conditions, placement methods, and finishing needs.
At the batch plant, materials are carefully weighed or measured:
Material conditions also matter. Sand and stone can hold moisture, especially after rain. Producers account for this moisture when determining how much water to add.
Accurate batching helps the concrete achieve the consistency and performance the project requires.
Concrete can be mixed in different ways depending on the plant and equipment.
Some plants use a central mixer before loading the concrete into a truck. Others load the measured ingredients into the truck drum for mixing. Some operations combine plant mixing with additional mixing in the truck.
The goal is the same: Distribute the ingredients evenly throughout the load.
Proper mixing depends on established procedures, including the loading sequence, mixing speed, and drum revolutions. The rotating drum then helps keep the mixture uniform during delivery.
A delivery ticket accompanies the load. It typically includes information such as the mix identification, quantity, batching time, and project details. This record helps the receiving team confirm that the delivery matches the order.
Once the truck leaves the plant, delivery timing becomes a shared responsibility.
During transportation, drum rotation helps prevent the ingredients from separating. It does not stop hydration or eliminate the effects of time and temperature.
Several factors can affect delivery:
Good communication between the producer and contractor helps keep the pour organized. Before the first truck arrives, forms, reinforcement, equipment, and the placement crew should be ready.
If site conditions or the schedule change, notifying the producer promptly can help the team adjust deliveries.
When the truck arrives, the driver and site representative confirm the delivery location and load details.
Safe access is essential. Mixer trucks need suitable ground conditions, adequate clearance, and enough room to maneuver. The team should identify a safe discharge location and determine how concrete will reach the placement area.
Depending on the project, concrete may move directly through the truck chute or require a pump, conveyor, buggy, or other equipment.
The receiving team also reviews the delivery ticket and coordinates any required testing. Appearance alone cannot confirm whether concrete meets the project specifications.
Jobsite water additions may be permitted within the approved mixture and project requirements. Any adjustment must stay within applicable limits, be documented, and be followed by the required mixing.
Adding water beyond those limits can reduce strength and durability and increase shrinkage. Workability concerns should be addressed with the producer rather than through uncontrolled adjustments.
Testing provides information about the concrete delivered to the project. Requirements vary, but common tests include slump, temperature, air content, and strength specimens.
A slump test measures the consistency of fresh concrete. It helps determine whether the mixture falls within the specified range.
Slump does not directly measure strength. A higher slump also does not necessarily mean excessive water was added, because admixtures can increase flow without increasing water content.
Concrete temperature affects setting and strength development. Testing helps the team assess whether the concrete meets project requirements and whether additional weather protection may be needed.
Air content testing is especially important when specified air entrainment is needed for exposure conditions. Properly distributed microscopic air bubbles help concrete resist damage from freezing and thawing.
Test cylinders may be made from fresh concrete and tested at specified ages. Standard-cured cylinders are used to evaluate the concrete’s strength potential and compliance with specified strength requirements.
These results serve a different purpose from evaluating the actual strength of concrete in the structure.
Qualified testing personnel should follow the applicable sampling, testing, handling, and curing procedures. Accurate records help the project team evaluate results and address questions.
Placement brings fresh concrete into its final location, whether that is a slab, footing, wall, or another structural element.
The goal is to place concrete efficiently while limiting segregation, which occurs when the mixture’s components separate.
Crews distribute the concrete, bring it to the required elevation, and consolidate it as appropriate. Consolidation helps concrete settle around reinforcement and embedded items while reducing unwanted trapped air.
Equipment and techniques depend on the mixture and application. Improper consolidation can leave voids or contribute to segregation.
Steady placement also helps avoid unplanned interruptions. If previously placed concrete stiffens before the next portion is placed, a cold joint may form. Delivery timing and crew coordination help manage that risk.
For slabs and other exposed surfaces, finishing affects appearance, texture, and usability.
Crews first strike off the concrete to the required elevation. Floating and later finishing operations follow as conditions allow.
Timing matters. Final finishing should not trap or work bleed water into the surface. Bleed water is water that rises as the solid materials settle. Improper finishing can contribute to a weak surface, dusting, scaling, or other defects.
The finish should match the project’s intended use:
Jointing also requires planning. Contraction joints create locations where shrinkage cracks are more likely to occur. Their layout, depth, and timing depend on the project and method used.
A surface that looks finished still needs protection and curing.
Curing maintains suitable moisture and temperature conditions so concrete can continue developing its intended properties.
Concrete hardens through hydration. It does not gain strength simply by drying.
Curing methods may include:
The method must suit the project, finish, weather, and any later surface treatments.
Protection from moisture loss may be needed during placement and finishing. Specified curing should begin as soon as practical without damaging the surface.
Concrete also needs protection from freezing, impact, and premature loading. A surface may look hard before it is ready for vehicles, equipment, or construction loads.
A successful pour begins before the truck leaves the plant.
Before delivery:
During the pour, communicate changes promptly, document permitted adjustments, and coordinate placement with incoming deliveries.
After finishing, begin curing and maintain the required protection.
Ready mixed concrete depends on teamwork. Producers, drivers, contractors, testing technicians, and finishers each contribute to the final result.
Accurate batching establishes the mixture. Proper mixing and coordinated delivery support consistency. Careful placement and finishing shape the concrete, while curing supports strength and durability.
Understanding these steps helps owners ask better questions and helps project teams prepare for the work ahead.
Planning a concrete project in Indiana? Visit the IRMCA Member Directory to connect with member companies serving the concrete industry.