Grout Plant Selection Guide: 12 Questions Buyers Ask
Most enquiries for a cement grout plant start with a capacity figure and end with a price comparison that misses the things which decide whether the plant works on site. This guide collects the questions that actually change a specification, in the order a grout plant manufacturer needs them answered. Eizoo’s application team hears these same questions from buyers specifying plants for Chinese and overseas sites, and the answers below reflect that experience. If you can answer twelve of them before you send the first email, the quotation you get back will be worth comparing.
Output and duty
1. How much grout does the job need per hour, and for how long?
Output is not a single number. A plant that averages 8 m³/h across a shift may still need to deliver 20 m³/h for twenty minutes while a hole is being filled. Specify both the sustained rate and the peak, and say how many hours a day the plant is expected to run. Continuous work such as SMW, TRD or CSM wall construction is a different machine specification from intermittent foundation grouting, even when the daily volume is identical.
2. Is the work batch or continuous?
Batch mixing gives you control over every batch and a natural record of what was mixed. Continuous mixing gives you steady supply and a smaller buffer. The injection method usually decides this for you: if the rig draws without stopping, continuous supply removes the surge that otherwise shows up as pressure fluctuation. Our comparison of batch and continuous mixing works through the trade-off in detail.
3. Do you need a holding tank between the mixer and the pump?
A holding tank is often the cheapest output upgrade available, because it lets batching and placing overlap instead of running in sequence. It is not always the right answer: mixes with a short working window and duties made of short, separate placements gain little. The holding tank decision checklist covers the cases in the order that decides them.
Mixing and mix design
4. What does the mix actually require from the mixer?
Colloidal and high-shear mixers break up cement agglomerations that a paddle mixer leaves intact, which changes bleed, stability and the strength you get from the same cement content. If the specification calls for low bleed or a low water-cement ratio, say so when you ask for the mixer, not when the plant arrives. See whether high-shear mixing matters for your mix.
5. How many admixtures, and how accurately must they be dosed?
One admixture line is a different machine from four. Above two or three admixtures, recipe management stops being a convenience and becomes the only way to keep mixes repeatable across shifts and operators. Ask what the dosing tolerance is, how the lines are flushed, and whether the recipe is stored with the batch record.
6. What tolerance does the specification put on the water-cement ratio?
Weighing accuracy, meter drift and operator habits all show up here. If the spec sets a tight W/C window, the plant needs weighing rather than volumetric batching, and the record needs to capture what was actually batched. Our note on why the water-cement ratio drifts lists the faults worth ruling out.
Powder handling
7. Bagged cement or bulk silo?
The answer is usually volume driven, but the real comparison is handling labour, waste, dust and the cost per tonne delivered into the mixer. Bulk wins quickly on volume and loses on sites with poor access or short campaigns. The full comparison is in bagged versus bulk cement feeding.
8. Vertical silo or horizontal silo?
Transport height, wind exposure, site clearance and how often the plant moves decide this. Horizontal silos suit low-clearance, high-wind and frequently relocated sites; vertical silos suit fixed installations with room above them. See horizontal versus vertical silo layouts.
9. Does the powder line hold the output you just specified?
Silo discharge, screw conveyor capacity, mixer cycle and pump draw have to be sized as one line. A mixer that can produce 20 m³/h is irrelevant if the conveyor feeding it delivers cement for 12. Our powder line sizing guide covers the check before you order.
Control, records and site reality
10. What records does the project require?
Pressure, flow, W/C ratio and batch data are increasingly part of the deliverable rather than an internal QA exercise. Ask what the plant records, whether the record is tamper-evident, and how it is exported. A printout requirement should be stated in the enquiry, because retrofitting data capture is far more expensive than specifying it.
11. What power and water are actually available on site?
Three-phase power of the right capacity and a water line that holds pressure are the two utilities that decide whether a plant ever reaches its rated output. Confirm both before mobilisation. The power and water planning note lists what to verify.
12. Where will the plant stand, and how will it get there?
Access width, turning circle, ground bearing, hardstanding, drainage and dust all belong in the first conversation. Compact and containerised configurations exist precisely because these constraints are common. If the site is narrow or enclosed, say so up front: it changes the recommended layout more than any other single piece of information.
A short checklist to send with your enquiry
| Question | Why the supplier needs it |
|---|---|
| Sustained and peak output, hours per day | Sets mixer size, pump size and cooling duty |
| Batch or continuous, and the injection method | Decides buffer volume and control strategy |
| Mix design, W/C tolerance, admixture count | Decides mixer type, dosing lines and weighing accuracy |
| Bagged or bulk, silo orientation | Decides the powder handling layout |
| Required records and export format | Decides the control and instrumentation package |
| Available power and water | Decides motor specification and whether output is achievable |
| Site access, clearance and ground conditions | Decides footprint, transport configuration and silo type |
Where to go from here
Send the checklist above with the quantity and the project location, and the quotation you receive will be comparable line by line. For a plant sized to your mixing method and site, talk to Eizoo Machinery’s application team before you commit capital — send the checklist and project location to Eizoo, and a Chinese grout plant manufacturer will come back with a configuration rather than a price alone. If you want to see how suppliers hide cost in the fine print, read how to read a grout plant quotation before the quotes arrive. For a broader walk-through of the selection itself, start with our guide to choosing a geotechnical grout plant, or browse the AGP-V60 automated cement grout plant as a typical starting configuration.
Frequently asked questions
What output should I specify if I am not sure?
Work backwards from the hole volume and the number of rigs you need to keep supplied, then add realistic utilisation. Over-specifying output costs capital and under-specifying it costs shifts, so give the supplier both the steady rate and the peak draw and let them size against the duty.
Is a containerised plant worth the extra cost?
It depends on how often you move and how far you are from service. Containerised stations reduce mobilisation time and protect the plant on remote or exposed sites, which pays back faster than the capital difference suggests on short or repeated campaigns.
Do I need full automation?
Automation earns its cost where the specification requires records, where the mix is complex, or where operator turnover is high. On simple, short, single-mix jobs a simpler control package is often the better use of budget.
What is the most common specification mistake?
Specifying the mixer and forgetting the powder line. Output is set by the slowest element in the chain, and that is usually cement delivery rather than mixing. Eizoo’s quotation reviews check the powder line first for exactly this reason.
How early should the supplier be involved?
Before the site layout is fixed. Access, power, water and silo orientation are far cheaper to plan than to work around once the plant has been built. Eizoo recommends involving the grout plant supplier while the specification is still fluid, not after the layout is fixed.