Batching plant alternative for scattered pours: what carries the batching to the work

If concrete is wanted in three places this month and somewhere else next month, or on one site for only a few weeks, a fixed or semi-mobile batching plant is answering a question you are not asking. A plant is a decision about a piece of ground before it is a decision about concrete. It produces at one point on the map, the pour happens at another, and the distance between them is governed by a clock rather than by the plant's rating. Where that distance differs at every site it feeds, the plant is sited for the average and fails at the one furthest out. The alternative is not a smaller plant. It is to carry the loading, the proportioning and the mixing to the work on one chassis.

Seven conditions have to hold, and not one is the mixer people picture when they price a plant. A site you can hold for the length of the work. A power supply, or a generator sized for the mixer and the conveyors. Stockpile area for aggregate, with access good enough for tippers to keep it filled. A cement silo. Water. Somewhere for washout to settle. And a way of getting the concrete from where it is made to where it is poured. Each is a condition rather than a cost, and one that fails does not make the plant cheaper; it makes it idle. The last is the one most often left out of the comparison, and on scattered work it becomes the whole problem: the ready-mixed concrete specification itself tells a purchaser to consider the projected transportation time between the batch plant and the point of delivery.

The binding limit on a fixed plant is rarely how much it can mix. It is how far the concrete can travel before it has to be in the form, and the clock starts when the mixing water meets the cement and aggregates rather than when the truck leaves the gate. The American ready-mixed concrete specification no longer states a number. In its 24d edition, clause 6.1.10 makes the limit from the start of mixing to the completion of discharge the purchaser's to state, falls back to the producer where he states none, and requires the time limit printed on the delivery ticket. Clause 6.1.9 puts the drum-revolution limit, which governs when discharge must begin, on the purchaser in the same way and with the same fallback to the producer. Some authorities have put a number back. California's health facilities authority requires discharge completed within one and a half hours and within 300 drum revolutions, of which no more than 100 may be mixing, and lets neither party waive either, though it sets out a documented procedure for unplanned delays.

What that does to a haul is arithmetic you can run on your own figures. Take a ninety-minute limit, the one California still imposes on the work it regulates and the one the specification carried until it was deleted. Assume ten minutes from water to the plant gate, thirty-five out, fifteen waiting at the site: sixty gone, thirty left for discharge and placement. Move the pour front ten kilometres further on at an assumed thirty kilometres an hour and the outbound leg grows by twenty minutes, so the window falls from thirty to ten. None of those four durations is measured. Substitute your own and the shape survives, because the allowance is fixed and the haul is not. On scattered work the leg does not grow once. It is a different number for every site, and the site at the far end of the radius runs out first.

The evidence here is our own: a read of the customs declarations on both sides of the record, done row by row. China declared 18,017 concrete-mixer vehicles exported under HS 8705.40 in 2024, worth USD 800.26 million, across 145 partner entries whose rows add back to the world row exactly. The seven largest destinations carry 9,523 units between them, 52.9 per cent of the total. The tail behind them is long and thin: 57 entries record fewer than ten units and account for 200 units in total, and three entries are residual groupings rather than countries at all. So a little over half of this trade moves through seven lines, and rank thirty took 108 units and rank ninety took eight, and the fifty-seven entries under ten units account for 200 machines between them.

The step that makes those figures usable is the one most published rankings skip. A single query returns the total row alongside every partial view of the same total — split by customs procedure, by mode of transport, by second partner — and nothing marks the duplicates as duplicates. Sum every row of the query for Peru's 2024 imports of this heading from China and you get 1,124 units against a correct 281: a ratio of exactly four on units and on value. Four other reporters inflate twofold and two more fourfold. Every figure above comes from the one row where all three breakdown keys sit at their totals value. Five of the twelve importing countries that filed for 2024 then turn out to carry a modelled unit count rather than a counted one, and they give themselves away: the quantities are not whole numbers, and three of the five divide out at USD 58,536 per unit while the other two land on USD 63,315. A shared divisor is not a shared market.

Six things go onto our pages that the trade generally leaves off, and every one is checkable against a page already live on this site. We publish the drum's geometric volume and the volume of mixed concrete that comes out as two separate numbers, and never derive one from the other: on the SLM-18, a 2,900 litre drum discharges 1.6 to 1.8 cubic metres a load. We say when a dimension's measuring position has not been established — ten of the sixteen self-loading mixers in our records carry overall dimensions, and on nine the plant gave figures without stating what position the machine stood in, so those widths stand and those heights are not offered as clearance figures. And we leave a cell blank rather than estimate it: one published model shows no discharge capacity, because two specification sheets disagree and a conflicting row does not render.

The other three are about what a specification may be attributed to. The cubic-metres-an-hour line exists on all six published model sheets, is empty on all six, and stays empty. Weighing is stated model by model rather than as a category feature: the electronic hydraulic weighing device is standard on one of the six, an option on four and on neither list on the sixth, and we say in writing that the option list runs line-wide, so an entry proves the device can be fitted to that line and nothing about how your machine was built. And we state the origin rule the way the agreement writes it: Form E is applied for by the exporter and an importer cannot open one, and where it was not issued at shipment, nor within three days of it, the ACFTA procedures say it shall still be issued at the exporter's request within twelve months of the shipment date, marked ISSUED RETROACTIVELY in Box 13.

Six dimensions decide this, and we can put a sourced figure on four. The other two say so rather than answering.

A plant wins when the demand sits still. If concrete is wanted continuously, from one location, for long enough to justify the installation, and there is ground and power for it, the fixed plant is the better machine and nothing above argues otherwise. It also wins where several pour fronts run at once, for reasons of arrangement rather than measurement: a plant can fill a second truck while the first is driving, and a single self-loading machine cannot load the next batch while discharging this one. It wins on paperwork too, wherever a specification demands proportioning certified per batch, batch tickets or mix designs that change between loads. And a third answer beats both and should be checked first: if a ready-mix supplier already sits inside your discharge window and can reach the pour inside it, buying concrete is simpler than owning anything.

Three gaps on our side belong in the body rather than in a footnote. There is no price here for either option: we hold no sourced figure for a plant, our own pricing is a commercial decision not yet taken, and a payback period built from two unsourced numbers would be the most useful-looking and least true thing on the page. There is no output figure of any kind — not cubic metres per hour, per day, loads per shift, nor fuel — because none has been supplied for any machine in our records, and a rate got by multiplying a discharge volume by an assumed cycle time is arithmetic wearing the clothes of a measurement. And the documents behind the discharge window above are American: no destination market's concrete code has been read for this page, so no national limit is stated anywhere on it.

There is nothing to sign up to here. Send a model number and a destination port, and what comes back is a written quotation: one landed figure to that port with the shipping mode written into it, the certificates your market requires named, and Form E applied for on our side, because an importer cannot open one. Where a specification you need is one we do not hold in writing, the answer says so rather than filling the column from a neighbouring machine — that carry-over is where a container booking goes wrong, and it is why several rows in our published range are blank. The customs heading is confirmed by your broker before the proforma, since this machine answers to both 8705.40 and 8474.31 and the heading used decides whether it arrives as a vehicle or as machinery.