Transit Mixer Productivity in India: Trips per Day and Cycle Time

What is transit mixer productivity?

Transit mixer productivity is the amount of concrete one mixer truck actually delivers in a working day, measured in cubic metres. It is worked out as the size of one load multiplied by the number of trips the truck completes. A transit mixer is a truck with a rotating drum that carries ready-mixed concrete from a batching plant to your site, keeping it turning so it does not set on the way.

Only one half of that sum is a machine specification. The load size is printed on the spec sheet. The number of trips is decided by your haul distance, the traffic between the plant and the site, how fast the plant fills the drum, and how long the truck waits at the pour. Two contractors running the same 6 m³ (6,000 litre) mixer on the same day can end up 30 m³ apart.

This guide gives you the figures that come from the machine, says plainly which figures no manufacturer publishes, and shows you how to work out your own trips per day from numbers you can measure on site in one morning.

How much concrete does one transit mixer load carry?

Across the 30 mixer units we list, the nominal filling capacity runs from 3.0 m³ to 12.0 m³. Nominal capacity means the volume of mixed concrete the drum is rated to carry, and it is the figure you should plan a pour around. The geometric volume, which is the total empty space inside the drum, runs much higher at 6,350 to 20,690 litres, because a mixer drum is never filled to the top. If it were, concrete would spill out as the drum turns.

The gap between the two is the filling ratio. On 29 of the 30 machines it sits between 47% and 59%, so a little over half the drum is concrete and the rest is the air the mixing action needs. One machine publishes a figure that does not agree with its own two volumes and has been excluded from that band; it is named at the end of this guide.

The 6 m³ class is the most common size on Indian sites. Of the 30 mixer units we list, nine are 6 m³, six are 7 m³ and five are 8 m³.

Table 1: Transit mixer capacity classes and load weight

The load weights above are not our estimate. Every one of the 15 machines that publishes a loaded weight works to exactly 2,400 kg per cubic metre of concrete, without a single exception across the range. That is a useful number to carry in your head: it is the weight your site road, your ramp and your slab formwork have to take when the truck arrives. Load weight and truck sizing are covered in full in our guide to transit mixer capacity and load weight.

How many trips per day does a transit mixer do?

There is no published answer to this, and any guide that gives you one flat number is guessing. Trips per day is your working hours divided by one full cycle time, and cycle time is mostly made of things that happen off the machine.

What you can do is build the number from parts. One cycle is:

• Loading at the plant: the drum is charged with mixed concrete.
• Haul out: plant to site, on the road.
• Waiting at the site: queueing behind the truck that is still discharging.
• Discharging: the drum reverses and the concrete comes down the chute.
• Return: site back to plant, empty.

Then trips per day = working hours ÷ cycle time, and output per day = trips × load size. A 6 m³ machine turning a 90-minute cycle over a 9-hour shift does six trips, which is 36 m³ of concrete. The same machine on a 3-hour cycle does three trips and 18 m³. Nothing about the truck changed; the haul did.

Time each leg with a phone for two or three cycles on your own route and you will have a cycle figure good enough to plan a pour with. Measure it at the hour you actually pour, because a 15 km haul at 6 in the morning and the same haul at 6 in the evening are different jobs.

How fast does a transit mixer travel on the road?

The nine truck-mounted transit mixers we list publish a maximum road speed of 60 to 80 km/h. Read that as a ceiling, not as a planning figure. A loaded mixer on a state highway with a 28-tonne gross weight does not hold 80 km/h, and inside a city it will not come close.

Gross vehicle weight, which is the total legal weight of truck plus drum plus concrete, is 28,000 kg on seven of the nine machines and 35,000 kg on two. The heavier pair are the 8×4 machines that carry the bigger drums. Fuel tanks run from 220 to 300 litres.

Table 2: Road speed and weight, truck-mounted transit mixers

Speed matters to productivity only through the haul legs, and those are the two parts of the cycle you can genuinely shorten by choosing a nearer plant. Diesel is the other half of that decision: our guide to transit mixer mileage and fuel consumption covers what these trucks return per litre and what a round trip costs you in fuel.

Why does the 90-minute rule cap your trips?

Concrete starts to stiffen from the moment water meets cement, and there is a window inside which it must be placed and compacted. That window is what limits how far a plant can usefully be from your site, and therefore how long a haul leg you can accept.

This is the part of transit mixer productivity that a longer cycle does not simply make slower; past a point it makes the load unusable. A truck that arrives outside the window is not a late delivery, it is a rejected one, and the drum still has to be washed out before the next trip. Our guide to how transit mixers work in India sets out the workability window and the timing rules in detail, and it is worth reading before you fix a plant.

The practical consequence for planning is simple. Adding trips by pushing the truck harder on a long haul does not work. Getting the plant closer does.

Which productivity figures does the spec sheet not give you?

Two of the five legs of the cycle have no machine specification behind them at all, and it is worth knowing that before someone quotes you a number for them.

Discharge rate is not published. Not one of the 40 transit mixers we list publishes a discharge figure in cubic metres per minute, in either of the two spec stores on the product pages. How fast concrete comes out depends on the mix, the slump, the chute angle and how the driver works the drum. If a dealer quotes you a discharge time, ask for it in writing and treat it as their estimate rather than a specification.

Loading time is not a machine figure either. It belongs to the batching plant, not to the truck, so no mixer spec sheet can carry it. Your plant operator can tell you what a charge takes.

What the machines do publish is drum rotation speed, at 0 to 12 rpm on 13 of the 30 mixer units and 0 to 14 rpm on the other 17. That is the speed the drum turns at, and it is set by the drive type rather than by the drum size. It affects mixing and discharge but it is not a discharge rate on its own. The rotation figures and the drive types behind them are covered in our guide to transit mixer drum drive.

How many loads will your pour need?

This is the one productivity question that needs no site measurement at all, because it is pure arithmetic off the published load size. Work out your concrete volume, divide by the machine’s nominal capacity, and round up. You cannot order two-thirds of a load.

Table 3: Loads needed by pour size

For a slab that has to go down in one continuous pour, the loads must also arrive without a break long enough to form a cold joint, which is a weak line where fresh concrete meets concrete that has already begun to set. That usually means running two or three trucks in rotation rather than one truck faster. Compare live transit mixer models and prices and talk to a dealer about what your pour sizes actually need.

If the concrete is being pumped rather than tipped, the pump’s output becomes the other half of the sum, and matching the two is what keeps both machines busy. Our guide to concrete pump output and pressure covers that side.

Is a self-loading mixer more productive than a transit mixer?

They answer different questions, so the honest comparison is per site rather than per hour. A transit mixer brings ready-mixed concrete from a plant, so its output is capped by the haul. A self-loading concrete mixer batches and mixes its own concrete on site from your own aggregate, cement and water, so it has no haul at all, but it has to load and mix every batch itself and its drum is much smaller.

For a large continuous pour with a plant within reach, transit mixers win on volume. For scattered rural work, a road job with no plant nearby, or small daily pours, the self-loading machine keeps working where a transit mixer would spend its day on the road. We cover the output side of those machines separately in self-loading concrete mixer productivity, and the buying decision between the two in self-loading mixer versus transit mixer.

The same cycle thinking applies to every machine that hauls or loads. If you run a mixed fleet, our guide to wheel loader productivity uses the same load-and-cycle arithmetic on the loading side.

Transit mixer productivity, in short

One load is 3.0 to 12.0 m³ depending on the machine, and it weighs 2,400 kg for every cubic metre it carries. The number of loads per day is yours to measure, not the manufacturer’s to publish. Time your own cycle over two or three trips, divide your shift by it, and multiply by the load size. That figure will be worth more than any number in a brochure, because it is your route, your plant and your traffic.

Before you buy, check the drum condition and the hours on any second-hand machine; our used transit mixer buying guide covers what to look at. For what wears out and what it costs to keep running, see transit mixer parts and components, and for the wider family of machines, our guide to concrete mixer types.

A note on the figures in this guide

Every capacity, volume, weight, speed and tank figure above is taken from the specifications published on our own transit mixer product pages at the time of writing, across the 40 machines we list. Two figures were deliberately left out of the published bands. The Schwing Stetter AM 12 (C) publishes a filling ratio of 79% against its own nominal capacity and drum volume, which work out to 58%; the figure has been referred to the manufacturer and excluded here. The Conmat MR 70XL states its capacity as an open-ended “7.0+ m³”, so it is not used in the ratio band either.

Prices, specifications and features are indicative, vary by variant, location and date, and should always be confirmed with the official OEM or authorised dealer before any purchase decision. DesiMachines is not liable for decisions taken on the basis of information that may have changed after publication.