Aggregate-Exposed Polish
in Gilbert.

Aggregate-Exposed Polish is one of five process tiers in the polished concrete catalog. The tier defines how deep we grind into the slab and how the final surface reads. Deep grind that fully exposes the aggregate stones in the slab. Maximum visual character: every floor tells the story of the original pour. Best for spaces that want a striking architectural surface.

Where aggregate exposure fits in the Mint catalog: this is the process Danny specs when the project calls for showrooms or hospitality. Every install runs through the four-step polished concrete protocol, diamond grinding, slab repair, lithium-silicate densification, then progressive grit polishing through Full exposure. Foot traffic is allowed within 24 hours of the final pass; vehicle traffic at 72.

Who specs aggregate exposure

Showrooms is the most common project type for this tier in the Phoenix metro. Hospitality is the second-largest segment. Beyond those two, aggregate exposure ships into a range of commercial and industrial environments across Maricopa and Pinal counties:

• Showrooms
• Hospitality
• Lobby + entry
• Decorative commercial
• Architectural residential

How we install it

Mechanical surface prep is the foundation of every aggregate exposure job. Progressive diamond grinding opens the slab to the specified depth without scarring the surface beneath. Crack and joint repair happens between grind passes. Lithium-silicate densifier penetrates the open slab and chemically hardens it from the inside out. Final polish steps from 400 to 800 to Full exposure grit produce the spec-sheet finish. A penetrating impregnator-sealer locks it in, no topical film, no peel risk, no recoat cycle.

You are polishing whatever the batch plant sent

This is the honest part of a full-exposure floor: the stone in the slab was chosen years ago by a concrete supplier, not by a designer, and grinding down to it reveals exactly what is there. Around the Phoenix metro that usually means crushed granite and river rock out of local pits, which run warm gray through tan with flecks of quartz and darker basalt. It is a good-looking mix, and it is also variable. Two slabs poured on the same project a month apart can come from different pit runs and read as noticeably different floors.

How the concrete was placed matters as much as what was in it. Aggregate settles, and it settles unevenly if the mix was over-watered on a hot day or the crew vibrated one bay harder than the next. Grind into a slab like that and you get dense stone in some areas and cloudy paste in others. Nothing fixes that afterward, which is why we cut a test panel on every aggregate-exposure job before committing to the depth. A two-foot square in an out-of-the-way corner tells you more about the finished floor than any sample board ever will, and the client gets to look at the real thing and approve it.

How deep is deep enough

The exposure classes are a spectrum, not three settings. A cream finish stays in the top skin and shows no stone. Salt-and-pepper cuts perhaps a sixteenth of an inch and reveals the fine sand fraction as speckle. Full aggregate exposure means going deep enough to slice through the large stone, typically an eighth of an inch or more, and it is the only class where you are cutting into structural material rather than surface paste.

That depth has limits, and they are worth respecting. Slabs are poured with a specified cover over the rebar or post-tension cable, and grinding eats into it. On a residential slab-on-grade with post-tension, going deep in a low area is a genuine risk, which is why we probe and, on anything questionable, scan before cutting. Slab thickness gets confirmed on the walkthrough rather than assumed. If a floor cannot safely carry full exposure, we say so and steer toward salt-and-pepper, which reads similar in photos and asks far less of the slab.

The look you actually get

• Terrazzo-adjacent without the price of terrazzo, since the stone is already in the floor
• Movement and depth under raking light, which is why it photographs well in showrooms and hospitality spaces
• Visible slab history: cold joints, saw cuts, and old core holes stay part of the composition rather than disappearing
• Excellent camouflage of everyday dirt in high-traffic public areas, because the pattern is busy by nature

That last item is the practical reason restaurants and retail keep picking it. A uniform cream floor shows every scuff and every dropped fry; a fully exposed floor absorbs them visually. The tradeoff is that it commits the space to a specific, strongly patterned look that is difficult to walk back later.

Cutting it without wrecking the schedule

Deep grinding is the slowest and dustiest phase of any polishing work, and it produces real volumes of slurry or dust depending on method. On occupied buildings we run dry under HEPA extraction and stage the room in zones so the space keeps functioning. Expect an aggregate-exposure job to take longer than a cream or salt-and-pepper floor of the same square footage, because the opening cut is doing far more work.

Summer adds a wrinkle in non-conditioned buildings. Tooling and slab both get hot, densifier flashes off faster than it should, and crews slow down in the heat. On July and August work in an unconditioned warehouse we start at first light and get the aggressive passes done before the building climbs. Roughly when the slab was poured is the single most useful thing you can tell us on the first call, and the test panel answers everything else.