Exposed Aggregate Concrete Adelaide: Costs, Finishes & What to Expect

(copy exactly)

Title: Exposed Aggregate Concrete Adelaide: Costs, Finishes & What to Expect

---

Exposed aggregate is the most popular decorative concrete finish in Adelaide — and for good reason. It's durable, slip-resistant, hides tyre marks, and looks better than plain grey concrete for the life of the driveway. But it costs more, and there are a few things you need to know before you book.

---

What Is Exposed Aggregate Concrete?

Standard concrete is poured and finished with a broom or float, leaving the surface smooth with a textural drag. Exposed aggregate concrete uses the same pour process, but before the concrete fully sets, the top layer of cement paste is washed away — revealing the natural stones (aggregate) embedded in the mix.

The result: a textured, pebbled surface that's:

• Slip-resistant — the rough texture gives grip, important near pools and on sloped driveways
• Stain-resistant — tyre marks and oil blend into the aggregate pattern, whereas they're obvious on plain grey
• Decorative — dozens of aggregate colour combinations are available
• Durable — the aggregate stones are harder than the cement paste, so the surface wears better over time

---

Exposed Aggregate Costs in Adelaide (2026)

Application	Price per m²
Standard exposed aggregate (driveway)	$90–$120/m²
Premium aggregate mix (feature colours)	$110–$150/m²
Pool surrounds (special non-slip grade)	$100–$140/m²
Exposed aggregate paths/entertaining areas	$85–$115/m²

These prices include supply, labour, formwork, standard ground prep, and sealing. Excavation, existing concrete removal, and drainage works are additional.

---

Aggregate Types Available in Adelaide

The aggregate (stone) mix determines the final look. Common options:

River pebble (most popular)

Smooth, rounded stones in natural tones — grey, beige, sand. Blends with most SA home styles. The most cost-effective option and widely available in Adelaide.

Granite aggregate

Harder and more angular than river pebble. Creates a coarser texture with more sparkle. Grey, pink, and black granite mixes are common.

White quartz

Bright white aggregate for a modern, high-contrast look. Popular in new builds and renovation projects aiming for a premium finish.

Coloured stone mixes

Terracotta, charcoal, cream — pigmented or naturally coloured stones. Costs slightly more than natural aggregate but allows the driveway to match the home's palette.

Recycled glass aggregate

Less common but available. Creates a distinctive, jewel-like surface. Requires careful finishing and a polymer-modified sealer.

---

The Exposed Aggregate Process — Step by Step

Understanding the process helps you manage expectations:

Site prep — Ground is levelled, compacted, and a base of crushed rock or sand is laid.

Formwork — Timber or steel forms are set to the correct height and alignment.

Pour — Concrete is poured and levelled with a screed.

Retarder spray — A chemical retarder is sprayed on the surface to slow the cure of the top paste layer (this is what makes the washing possible).

Cover — Hessian or plastic sheeting is laid to protect the surface from drying too fast (critical in summer).

Washing — 8–24 hours later (depending on temperature), the retarder is washed off and the top paste is brushed away, revealing the aggregate.

Cure — The slab continues to cure over 28 days.

Sealing — A penetrating sealer is applied after 28 days to protect the surface and enhance the colour.

Why timing matters: If the concrete is washed too early, aggregate falls out. Too late, and the paste is too hard to wash off. An experienced crew reads the cure stage correctly — this is where cheap operators cut corners.

---

Adelaide Climate Considerations

South Australia's summer is hard on fresh concrete. In January and February, surface temperatures can exceed 50°C on exposed sites, which causes the concrete to dry too fast, reduces strength, and makes the retarder timing much harder to manage.

A good contractor will:

• Schedule pours for early morning (6am starts on hot days)
• Use shade cloth or misting in extreme heat
• Add an evaporation retarder to the mix on days above 35°C
• Avoid pours when the forecast shows 40°C+ or strong northerlies

If a contractor says they'll pour on a 42°C Adelaide day without any heat mitigation — that's a concern.

---

Exposed Aggregate vs Stamped Concrete vs Pavers

Factor	Exposed Aggregate	Stamped Concrete	Clay Pavers
Cost	$90–$150/m²	$100–$160/m²	$100–$200/m²
Slip resistance	High (natural texture)	Medium (depends on pattern)	High
Maintenance	Reseal every 5–8 years	Reseal every 3–5 years	Weed, re-sand annually
Repairs if cracked	Grind and patch (visible)	Difficult to match pattern	Replace individual pavers
Adelaide popularity	Very high	Moderate	High

For most Adelaide driveways, exposed aggregate offers the best balance of cost, durability, and visual appeal.

---

Sealing — Do It Right

A penetrating concrete sealer is the most important maintenance step for exposed aggregate. It:

• Locks in the colour
• Prevents oil, grease, and dirt from penetrating the aggregate
• Extends the life of the surface significantly

When to seal: First seal after the 28-day cure is complete. Re-seal every 5–8 years depending on traffic and UV exposure.

Don't use a glossy topcoat sealer on driveways — it creates a slippery surface when wet and peels under tyre traffic. Use a penetrating or impregnating sealer (Dry-Treat, Enhancer Shield, or similar).

---

Getting a Quote

Opal SA Construction installs exposed aggregate driveways, paths, patios, and pool surrounds across Adelaide metro.

SA Licence BLD 317725 · Own crew, no subcontractors · Free written quote within 48 hours.

Call Javed: 0466 801 058 or request a quote online.

---

FAQs

How long does exposed aggregate take compared to plain concrete?

The pour day is similar. The difference is the washing step, which happens the next day (or same evening on warm days). Total project timeline from pour to usable surface is typically 2–3 days, with the full cure at 28 days.

Can exposed aggregate crack?

All concrete can crack. Control joints (saw cuts) are placed at regular intervals to manage where cracking occurs — ideally along the joints rather than randomly across the surface. Proper reinforcement and a suitable concrete mix reduce the risk significantly. On reactive clay soils, thicker slabs and heavier reinforcement are used.

Is exposed aggregate suitable for pool areas?

Yes — it's one of the best finishes for pool surrounds because the natural texture provides excellent wet-surface grip. Around salt water pools, a polymer-modified sealer is recommended for better chemical resistance.

Can I match my existing driveway with new exposed aggregate?

Matching existing aggregate is possible if you know the original mix. We can often get close but not always identical — aggregate availability and batch colours vary over time. We'll show you sample boards at the quote stage.

---

Published: 19 April 2026 · Opal SA Construction · BLD 317725

---

---