Turn lunar soil into stone.
No bulk water. No cement kiln.
The credible lunar baseline is dry, binderless and compression-first: excavate whole regolith, screen only what the process needs, compact it, fuse selected regions and inspect every lot.
Scoop → screen → compact → fuse → inspect.
S01 maps and skims a qualified cell. Whole regolith remains the default feed; oversize becomes berm material.
P01 weighs, rejects rocks and meters recipe-selected grading into a sealed hopper.
R01 grades thin lifts, compacts a slip-form or fills reusable molds for keyed units.
F01 scans a 2.45 GHz microwave or qualified laser head over the surface under thermal feedback.
Cool under control; scan geometry and cracks; run NDE and witness-coupon acceptance before release.
Start horizontal. Earn vertical.
Raw civil works
Grade, compact, trench, backfill and mound. Lowest energy; the largest local-mass multiplier.
Fused horizontal skin
Harden dust-control lanes, utility zones, pavers and test pads where brittle material remains in compression.
Keyed masonry
Batch-compact and step-heat pavers or blocks, then robotically assemble arches, vaults and protective shells.
Cast / melted units
Later molds produce abrasion tiles and high-load bases, accepting higher energy, refractory and shrinkage risk.
Vertical freeform “printing” is not the first mission. Horizontal infrastructure and assembled compression units are easier to support, inspect and repair.
Vacuum changes the heat problem.
Closed-loop power and scan speed expose poor coupling and thermal runaway.
Small vacuum tests show gas evolution and pores can appear as temperature rises; the cycle must be site-qualified.
Vacuum removes convection. Cooling schedule and conduction paths become part of the recipe.
Strength values from gram-scale simulant coupons are evidence for experiments—not guarantees for a full-scale wall.
What the first lunar fleet may—and may not—claim.
Raw screened regolith; compact and scan density/geometry.
Loose or compacted local mass around a delivered pressure vessel.
Compacted lifts with microwave- or laser-fused wear surfaces.
Keyed blocks, arches, domes and compression ribs after structural qualification.
Requires full plume, thermal shock, erosion, fracture and inspection qualification.
Use an imported certified pressure liner, doors, windows and tension system.
Waterless does not make every binder viable.
Not the lunar baseline
Exposed lunar temperature and vacuum create melt, loss and thermal-cycle risks; local sulfur is scarce and still needs extraction. Keep it a shielded cold-region research option.
Not external v1
Imported activator, water handling and vacuum cure control erase the simple local-material story. Reconsider only inside a sealed heated recovery tent.
Repair contingency
A high-regolith composite can make joints or patches, but imported polymer, radiation, outgassing and thermal limits prevent an ISRU-only claim.