Concreting a rural road when the nearest plant is out of cycle range

A road is a line, and a line has no delivery address. On a farm-to-market section the pour front advances with the work, so the point where concrete has to arrive in the afternoon is not the point it arrived at in the morning. A plant answers that by sending each truck to a different chainage, and every one of those runs is timed and priced on its own. The volume is rarely the difficulty; a village road is poured in modest bays. The difficulty is that the destination is never twice the same, the access is whatever the half-built formation offers, and a loaded transit mixer that cannot reach the front discharges where it can and leaves the rest to be barrowed. None of that is a property of the concrete. It is a property of the address, and it does not improve as the job goes on.

What limits the arrangement is a clock, and the clock is a contract term rather than a published constant. ASTM C94/C94M-24d states no default. Clause 6.1.10 requires the purchaser to state a time limit from the start of mixing to the completion of discharge, and if he does not, the producer establishes one and communicates it before delivery; the limit has to appear on the delivery ticket. Clause 6.1.9 does the same for the drum revolutions permitted before discharge begins. Note 10 records that the specification had carried a one-and-a-half-hour limit since its original publication in 1935, and that the figure has gone. So the first question on a road job is not how far the plant is. It is which document states your limit, and whether anyone has read it.

Some authorities have put a limit back by their own rule. California's health-care construction regulator requires discharge completed within one and a half hours of the mixing water meeting the cement and aggregates, and within 300 drum revolutions of which no more than 100 may be mixing revolutions. It states that neither producer nor purchaser may waive that. Two exceptions are written into the same notice: an alternative compliance method submitted to and approved by the agency, and a procedure for unplanned delay in which the operator records time, slump and temperature at ninety minutes, rechecks temperature at intervals, measures slump at 110 minutes, and ends placement at 120. That is one agency's policy for the hospital work it regulates, not a rule in force anywhere else, and it is quoted here as a documented example of a limit reimposed after the standard dropped it.

In four Philippine cities, the count of registered construction companies for each registered ready-mix supplier within 50 km runs between 44.5 and 69.6. Metro Manila returns 8,284 construction companies against 119 ready-mix suppliers, which is 69.6 to one. Iloilo returns 487 against 7 — the same ratio at a seventeenth of the scale. Cebu is 929 against 15, or 61.9 to one. Davao is the least stretched of the four, 623 against 14, or 44.5 to one. What a contractor should take from that is not a market size, and it is not a map. It is that within 50 km of Iloilo City the entire supplier list is seven names long, short enough to ring in an afternoon. Whether any of the seven will haul to his alignment inside the limit his contract sets is a separate question, and a count of firms cannot answer it.

Three conditions travel with those numbers. First, they count registered business listings inside a radius drawn around a city. A listing is not a plant, a plant is not a batching capacity, and one company can be listed under several categories, so the ratio measures how a market presents itself in a business directory and nothing further. It measures no distance, no haul willingness and no capacity. Second, the dataset holding those counts is recorded in our own archive as the version that contained an error; the correction that followed re-pulled a different business category and left both of the counts used above untouched. We have kept them with the flag attached rather than quietly promote them. Third, comparison across countries is unreliable because directory coverage differs by country, while comparison between cities of one country is the reading the data supports. That is the only comparison made here, and no African or Latin American city was ever measured.

Search behaviour corroborates the shortage without being asked to. An autocomplete sweep run with the country parameter set to the Philippines returns, for the stem "batching plant in", a list of provinces and cities rather than a list of brands: Cavite, Bulacan, Pampanga, Iloilo, La Union, Batangas, Pangasinan, Taguig. That is people checking one administrative area at a time whether a plant exists near them. The localisation was verified by difference rather than assumed — the same stem run against Nigeria and Kenya returned the global default completions, so the province list is genuinely what the Philippine index serves. It is a modest signal, and it is worth saying what it is not. These are the completions a suggestion service offers, not a count of searches, and they record what people went looking for rather than what they found.

The machine answers a moving address by carrying the batch instead of waiting for it: it loads its own aggregate with a self-loading bucket, mixes on board, drives to the front and discharges there. Six self-loading mixers are published on this site. Five of them carry a declared discharge figure per load, from 1.0 cubic metre at the small end to 4.0–4.5 at the large; the sixth carries none, because the specification sheets we hold disagree and we will not average them. Water is carried rather than fetched. One of the six has a water tank with a self-priming system, and the other five have an automatic water-fill controller with an external suction pump. We read that as the machine taking its water at the alignment rather than at a standpipe — that is the mechanism, not a figure in the specification.

The dimensions that decide whether a machine can follow a half-built road are the ones we are shortest of. Sixteen self-loading mixers appear in our specification records, and ten of them carry measured overall dimensions; those ten run from 1.60 to 2.30 m wide. Width is the figure to plan a lane against, and it is the one we can give. Height is not, on nine of the ten. Those nine figures reach us from the plants without the posture stated — travelling, or with the drum raised — and until that is confirmed in writing we will not present any of them as a travelling height. One machine is documented properly, on a drawing that separates the two postures. The SLM-18 measures 7.06 × 2.21 × 2.58 m travelling, articulated and four-wheel drive, with a 2,900-litre drum, a 78 kW Yuchai engine, an operating weight of 5,800 kg and a drum that lifts and rotates through 270°.

Weighing is uneven across the same six machines. Electronic hydraulic weighing is standard equipment on one model and an option on four; on the sixth it appears in neither list. On the one model where it is standard it is also printed in the optional list, which is an inconsistency in the equipment data we hold rather than a choice anyone made. Without it the bucket is loaded by eye, which matters on work tested against an approved mix design and matters a good deal less on a village slab — but it is a thing to specify rather than discover on delivery. What a drum rotating through 270° buys on a narrow formation is chute placement without turning the machine round; that is our reading of the specification and not a figure in it. Four of the six have no dimensioned drawing in our hands at all.

Three things stay open here, and in a quotation too. Shipping mode is the first. Of the six published mixers only two have measured overall dimensions. One of those two loads two units into a 40 ft high cube; the SLM-18 misses the door height by 45 mm and therefore moves on a flat rack, in an open top, or roll-on/roll-off. The door-opening arithmetic behind both verdicts is set out in the container guide on this site, and the other four are quoted out of gauge until a drawing arrives. The discharge limit that governs your own pour is the second. The clauses quoted above are a United States standard and one state agency's policy; we have not read the ready-mixed concrete code of the Philippines or of any other destination market, so we state no local limit. Ask for yours in writing before the mix design is approved.

The road programme itself is the third. We hold no sourced figure for farm-to-market road length, budget or cost per kilometre in any country, so none appears here, and nothing on this page should be read as an estimate of what such a programme costs or how much of it gets built in a season. What we do hold on the Philippines is import data, which is on the Philippines market page. That answers a different question — what has actually been shipped into the country, in what quantity and from where — and it is the only other measured thing on this subject we can put in front of you. Everything between the two, the part a supplier would normally fill with a payback table, is yours to work out with your own haul, your own crew and your own access.

Two of the photographs on the home page belong to this job. One is a mixer discharging through its chute onto a village road under construction, the drum crusted with cured concrete. The other is two workers screeding a narrow strip between timber formwork beside a paddy field, with a three-wheeler standing in for the aggregate delivery. Neither carries a verifiable location, so no country is attached to either, and the section's own disclosure says so rather than leaving it to be inferred. Plant identification has been painted out and faces blurred; nothing has been added to either picture. That is worth a sentence, because the alternative is the category standard — a rendering, or a stock photograph of a machine that was never on a road like this. What these two show is the unglamorous version of the job, which is the version a contractor recognises.