Ready-mix concrete union stoppage disrupts 70 construction sites

A work stoppage by the ready-mix concrete transport union, which began Monday, has disrupted concrete pouring at 70 construction sites across the Greater Seoul area, according to industry data.

As of 3 p.m. Tuesday, the Korea Contractors Association's ready-mix concrete work stoppage support center had logged disruptions at 70 sites operated by 12 large construction companies, with approximately 50,000 cubic meters of concrete pouring delayed due to halted supply. That volume is equivalent to roughly 8,348 mixer trucks.

With more than 19,000 construction sites currently active in the Greater Seoul area, the actual scale of disruption is expected to be far larger once unreported cases at other large and small construction companies are factored in.

"Even when concrete pouring stops, the costs of keeping workers and equipment on site do not," a construction industry official said. "With the added risk of penalty charges for schedule delays, a prolonged stoppage will only deepen the industry's losses."

The official added that the stoppage was compounding an already dire situation. "The construction industry has been pushed to its limits by rising material costs and a deteriorating market — this latest development has only heightened the sense of alarm across the sector," the official said.

Industry voices are also calling for reform of the construction equipment supply regime governing concrete mixer trucks to ensure a more stable supply of ready-mix concrete.

The Korea Contractors Association says the current supply adjustment system, which has restricted new mixer truck registrations since 2009, has entrenched a near-monopoly market structure. The association argues this has led to repeated disruptions — driven by freight rate hikes and collective refusals to haul — that continue to destabilize supply.

In response, one industry official said the system needs to respond more quickly to market conditions. "The review cycle for construction equipment supply adjustments should be shortened from two years to one, and supply expansion should be differentiated by region to better reflect local conditions," the official said.

Meanwhile, the Korea Contractors Association on Monday formally requested government mediation over the nationwide ready-mix concrete transport union's strike. The association said it would maintain a direct hotline with the Ministry of Land, Infrastructure and Transport to monitor damage at construction sites and continue pushing for its proposals to be adopted until the supply disruption is resolved.