Rough, pitted, or loose aggregate on a driveway, patio, or walkway usually means the surface has been through moisture, salt, and freeze-thaw stress. If the finish is dulling, scaling, or cracking along control joints, the next step is a site assessment that looks at drainage, slab support, and the concrete itself.
Calgary Concrete Company looks at exposed aggregate as a system: ready-mix concrete mix design, aggregate selection, water-cement ratio, air entrainment, reinforcement, joints, curing, and the conditions under the slab. In Calgary, Alberta, Chinook swings, snowmelt, de-icing salts, and moisture movement can change how exposed aggregate performs, so the right diagnosis matters before any repair or replacement is recommended.
Exposed aggregate should reveal stone evenly while keeping the cement paste matrix dense and durable. When the finish starts breaking down, the visible symptom tells only part of the story. We look at the pattern, the depth of wear, and where the damage starts.
For Calgary homeowners, the key question is not just what the surface looks like, but whether the concrete still has sound support and enough durability for local moisture and temperature swings.
Before recommending exposed aggregate repair or replacement, we inspect the slab as a whole. Calgary Concrete Company uses measurements and field observations to understand why the surface is failing, not just where it is failing.
When needed, industry tools such as GPR concrete scanning, rebar locating, rebound hammer testing, ultrasonic testing, or concrete coring may be referenced to confirm what is happening below the surface. Those methods help identify reinforcement location, density, and internal condition before a repair path is chosen.
Exposed aggregate is more than decorative concrete. It is a finish method where the surface cement paste is removed to reveal the aggregate in the mix, creating texture, traction, and visual character. The finished result depends on the original ready-mix concrete, the concrete hydration process, and the timing of surface exposure.
A balanced mix uses Portland cement, aggregate, water, and admixtures to achieve the right slump, workability, and compressive strength. Air entrainment creates microscopic air voids that improve freeze-thaw durability, which matters when snowmelt and de-icing salts keep bringing moisture back to the surface. Fibre reinforcement, rebar, or welded wire mesh may be used depending on slab type and loading, while control joints and isolation joints help direct shrinkage movement to planned locations.
Good exposed aggregate performance starts below the slab. A prepared subgrade should be compacted, then covered with a granular base or road crush so the slab has uniform support. If soil stays saturated or the base is uneven, the slab can move, crack, or settle. Drainage and soil conditions are just as important as finish quality.
For new exposed aggregate work, the sequence matters. Each step affects appearance, durability, and how the slab handles Calgary conditions.
That process is important whether the project is a new patio, a garage approach, a sidewalk, or a larger commercial concrete surface.
Exposed aggregate has to handle more than appearance. In Calgary, Alberta, Chinook temperature swings can move surfaces from thaw to freeze quickly. Snowmelt and de-icing salts bring moisture into the paste and the joints, then freeze-thaw cycling can expand that water and stress the surface. Over time, that can lead to scaling, spalling, and cracking if the mix design or drainage is weak.
Our climate also makes the base important. On sites near the Bow River or Elbow River corridors, or across the prairie-facing parts of Calgary, runoff and subgrade behavior can vary from one property to the next. On established inner-city and infill properties, limited space can make grading and drainage more critical because water has fewer places to go. The same is true around garages, driveways, and commercial aprons near Deerfoot Trail, Stoney Trail, Glenmore Trail, and Macleod Trail, where loading and surface exposure can be different from a sheltered backyard slab.
Exposed aggregate is chosen not only for texture and style, but because the finished surface can be built to suit local exposure when the mix, joints, base, and curing plan are matched to the site.
Not every damaged exposed aggregate surface needs full replacement. The decision comes from what the symptom shows, what the measurements reveal, and whether the slab still has sound support.
For exposed aggregate concrete, the repair decision should match the failure mechanism. A thin cosmetic repair on a slab with movement usually does not last. A slab with intact structure and isolated surface wear can often be managed with more focused work.
Exposed aggregate works well on several concrete surfaces across Calgary, Alberta. It adds traction underfoot and gives a finished look that suits both suburban homes and commercial properties.
Calgary Concrete Company also coordinates exposed aggregate with adjacent concrete repair, removal and replacement, concrete floors, or concrete foundations and footings where the project includes more than one surface.
Homeowners often want to know what the process looks like before work begins. We keep the sequence clear so the decisions are based on conditions, not guesswork.
For Calgary Concrete Company, the goal is a surface that fits the property and the climate, whether it is a new exposed aggregate driveway or a replacement patio that needs better drainage and stronger support.
Exposed aggregate reveals the stone within the mix after the surface paste is removed. Broom finish concrete leaves a brushed texture on the surface instead. Exposed aggregate gives a more decorative look and can offer traction, but it still depends on the same slab basics: base prep, joints, curing, and mix quality.
Scaling often comes from moisture entering the surface and freezing, especially when de-icing salts are present. A weak top layer, poor curing, or low air entrainment can make the surface more vulnerable. We look for that pattern along edges, low spots, and places that stay wet.
Sometimes. If the problem is isolated surface loss and the slab still has stable support, a repair may be workable. If crack mapping, elevation measurements, or settlement signs show movement below the surface, replacement may be the better choice.
Drainage controls how much water reaches the slab and subgrade. Poor drainage can saturate the base, reduce support, and increase freeze-thaw stress. That can lead to cracking, spalling, and uneven movement over time.
Control or contraction joints create planned crack locations. Concrete shrinks as it cures, and without joints the slab may crack where it wants instead of where it should. On exposed aggregate surfaces, joint layout helps manage that movement while keeping the finish intact.
We look at the concrete surface, take elevation readings, inspect drainage, check for settlement or heave, and review the slab layout. If needed, we discuss whether additional scanning or testing could help confirm the condition below the surface before any work is recommended.
If your exposed aggregate driveway, patio, or walkway is showing wear, Calgary Concrete Company can assess the cause and outline a practical path forward for Calgary, Alberta conditions.
Calgary Concrete Company
Calgary, Alberta
Email: [email protected]
Phone: +16477005472
Hours: Open 24 hours
Start With An Assessment
Share what you are seeing on the property, whether it is cracking, settlement, scaling, or a new build. We will help determine whether the right path is repair, levelling, removal and replacement, or a new concrete installation based on drainage, subgrade conditions, slab thickness, and the way the surface will be used.