Ready-Mix Concrete

What Is Ready-Mix Concrete?

Ready-mix concrete — also called transit mix, readymix, or simply truck mix — is concrete that is manufactured at a centralized batch plant and delivered to construction sites in a rotating drum truck. Unlike volumetric concrete, which is mixed on-site, ready-mix arrives at the jobsite already batched and ready to pour. The rotating drum keeps the concrete agitated during transport to prevent premature setting.

Ready-mix is the dominant form of concrete in North American construction. It is used in foundations, slabs, walls, bridges, roads, and virtually every structural concrete application. According to the National Ready Mixed Concrete Association (NRMCA), the U.S. ready-mix industry produces over 400 million cubic yards of concrete annually.

How Ready-Mix Concrete Is Made

The process begins at the batch plant, where raw materials — cement, water, fine aggregates (sand), coarse aggregates (gravel or crushed stone), and chemical admixtures — are combined in precise proportions according to a mix design specified by an engineer or the customer.

There are two primary batching methods:

Central mix (wet mix): All ingredients including water are mixed at the plant before loading into the drum truck. The drum rotates slowly during transit to maintain consistency.

Shrink mix / transit mix: Ingredients are partially mixed at the plant and the mixing is completed in the drum truck during transit. This is the more common method in North America.

Each batch is documented on a batch ticket — the official record of the mix design, material weights, water content, load time, and plant operator. The batch ticket travels with the load and is the primary compliance document for the delivery.

The Ready-Mix Delivery Cycle

Ready-mix concrete has one of the most time-critical delivery cycles in construction materials logistics. Once water contacts cement, a chemical reaction called hydration begins. This gives producers a limited window — typically 60 to 90 minutes or 300 drum revolutions, whichever comes first — to deliver and discharge the load before the concrete begins to set.

This window creates intense pressure on dispatch operations. A typical ready-mix delivery cycle moves through the following stages:

Order Entry — The customer places an order specifying mix design, yardage, slump, and pour time. The dispatcher enters the order and schedules the load.

Batching — The batch plant produces the load according to the mix design and loads it into the drum truck.

Dispatch — The driver receives the job manifest on their in-cab tablet and departs the plant.

In Transit — The drum rotates continuously. GPS tracking monitors the truck's position and ETA in near real-time.

On Site — The driver arrives at the jobsite. Geofencing triggers an automatic arrival timestamp. The concrete is discharged into forms, a pump, or directly.

Ticket Completion — The customer signs the digital ticket confirming delivery. An eTicket is generated with GPS-validated arrival and departure timestamps.

Return / Washout — The drum is washed out before the driver returns to the plant for the next load.

Efficient dispatch software tracks every stage of this cycle across the entire fleet simultaneously — giving dispatchers visibility into which trucks are loaded, in transit, on site, or returning.

What Makes Ready-Mix Dispatch Uniquely Complex

Ready-mix dispatch is widely considered one of the most demanding logistics operations in the construction materials industry. Several factors combine to create this complexity:

Time sensitivity — The hydration window means late deliveries are not just inconvenient, they result in rejected loads and wasted product. A single missed pour can cost thousands of dollars and delay a project significantly.

Pour scheduling — Concrete pours are often scheduled in sequences. A foundation pour may require multiple trucks arriving in precise intervals — too close together and the site gets congested, too far apart and the pour joint fails. This requires careful load spacing by the dispatcher.

Fleet utilization — Ready-mix plants typically operate with a fixed fleet size. Maximizing the number of loads each truck completes per day directly impacts revenue. Demand forecasting tools help dispatchers plan truck requirements before the day begins.

DOT compliance — Every ready-mix truck is a commercial vehicle subject to federal DOT regulations including hours-of-service rules, weight limits, and inspection requirements. Dispatchers must track driver hours alongside load assignments.

Weather dependency — Concrete cannot be poured in freezing temperatures or during heavy rain without special measures. Weather-related cancellations can cascade across an entire day's schedule.

Customer communication — Contractors on active jobsites need accurate ETAs. Providing real-time truck location to customers through a customer portal reduces inbound calls to dispatch and improves jobsite coordination.

Ready-Mix Fleet Technology

Modern ready-mix operations increasingly rely on integrated dispatch technology to manage fleet complexity. Key tools include:

GPS fleet tracking — Near real-time vehicle location with 5-second refresh rates gives dispatchers a live map of every truck's position and status. This visibility is critical for load spacing and ETA management.

eTicketing — Digital load tickets replace paper batch tickets, providing GPS-validated proof of delivery that satisfies DOT documentation requirements and state e-ticketing mandates where applicable.

Drum sensors — Mounted on the drum housing and wired into the vehicle computer, drum sensors monitor rotation speed to automatically detect when a truck is loading, in transit, discharging, or washing out — without requiring the driver to manually update status.

Batching integration — Plant-to-truck integration automates the handoff of batch data from the plant control system directly to the dispatch platform, eliminating manual ticket entry and reducing errors.

Push-to-Talk communication — Dedicated LTE radio hardware in each cab gives drivers and dispatchers instant voice communication without relying on cell phones, which can be unreliable on active construction sites.

Ready-Mix and Multi-Vertical Operations

Many ready-mix producers also operate aggregate hauling, volumetric mixer, or asphalt & paving fleets alongside their drum trucks. Managing multiple fleet types from a single dispatch platform — with a unified map, shared order management, and consistent eTicketing — eliminates the need for separate systems per vertical and gives operations managers total visibility across the business.

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

Ready-mix is batched at a central plant and delivered in a pre-mixed state in a rotating drum truck. Volumetric concrete is carried as separate dry and wet ingredients and mixed on demand at the jobsite using a volumetric mixer. Ready-mix is faster for large pours with a single mix design; volumetric is more flexible for projects requiring multiple mix designs or remote locations far from a batch plant.

How long does ready-mix concrete last in the truck?

The standard window is 60 to 90 minutes from the time water first contacts cement, or 300 drum revolutions — whichever comes first. Hot weather accelerates hydration and shortens this window significantly. Admixtures can extend workability in some conditions.

What is a cubic yard of concrete?

A cubic yard (CY) is the standard unit of measurement for ready-mix concrete volume in the United States. One cubic yard equals 27 cubic feet. A typical residential foundation pour may require 50 to 100 cubic yards. Drum trucks typically carry between 8 and 11 cubic yards per load.

What is slump in ready-mix concrete?

Slump is a measure of concrete consistency and workability — essentially how fluid or stiff the mix is. It is measured in inches using a standardized slump cone test. A higher slump means a wetter, more flowable mix. The required slump is specified by the engineer and noted on the batch ticket.

How does eTicketing work for ready-mix deliveries?

When the load is batched, the batch plant system generates a digital ticket that is sent to the driver's tablet. Upon delivery, the customer signs the tablet to confirm the pour. The dispatch platform generates a completed eTicket with GPS-validated arrival and departure timestamps — providing instant, tamper-proof proof of delivery for both the producer and the customer.

What DOT regulations apply to ready-mix trucks?

Ready-mix trucks are commercial vehicles subject to federal DOT regulations administered by the FMCSA. Key requirements include hours-of-service rest period rules for drivers, vehicle weight limits (typically 80,000 lbs gross vehicle weight on federal highways), periodic vehicle inspections, and commercial driver's license (CDL) requirements. Some states have additional axle weight or permitting requirements for mixer trucks due to their loaded weight.