Riverside construction comes with a familiar set of headaches. The Xiangjiang River waterfront in Changsha is no exception, saturated, low-bearing-capacity soil underlies much of the area, and the site earmarked for a new sports park was no different. Excavating and replacing the unsuitable material was considered early on, but the logistics and cost ruled it out quickly. The team needed to treat the ground in place.
The contractor started with a locally sourced mixer. It worked, up to a point. Output hovered around 40 m³/hour — manageable, but not fast enough given the volumes involved. The more pressing issue was reliability. Hydraulic oil leaks surfaced periodically under continuous operation, triggering unplanned stops, maintenance calls, and the kind of scheduling uncertainty that makes a site manager’s job difficult. With a fixed handover date and a large area still to treat, something had to change.
They brought in the ALLU PMX (Processor Power Mixer), mounted on a conventional excavator. The PMX uses counter-rotating drums to break up and thoroughly blend stabilizing binder, in this case, cement slurry, directly into the soft soil at depth, without excavation. The switch had an immediate effect on daily output: throughput climbed to around 75 m³/hour, roughly double what the previous unit had been delivering. The hydraulic system held up throughout the wet, demanding site conditions without a single unplanned stop.
Beyond raw speed, the PMX’s mixing action produced a noticeably more uniform result. Consistent binder distribution throughout the treated volume matters, weak zones in stabilized ground tend to surface during later construction stages, often at the worst possible moment. The site team didn’t encounter that problem here.
The site manager put it simply: “The old machine was slower and kept giving us trouble. With the ALLU PMX, we’re getting nearly double the output per shift and we’re not losing time to breakdowns. When you add it all up, less downtime, fewer delays, it more than justified the switch.”
Soft, waterlogged ground along river corridors is a common constraint across Chinese infrastructure projects, and the usual responses, soil replacement, preloading, pile foundations, each carry significant cost and time implications. In-situ mass stabilization with equipment like the ALLU PMX offers an alternative that’s worth serious consideration: the ground is treated where it sits, there’s no material to haul off-site, and a single excavator-mounted unit can cover ground quickly. At Changsha, it turned a problematic site condition into a resolved one — on schedule.
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