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Concrete finish options range from a coarse broom texture to smooth steel-trowelled or burnished surfaces, exposed aggregate, stamped colour, abrasive blasting and diamond-polished concrete. The right choice depends on the appearance you need, whether the work is done while concrete is fresh or after it cures, the project specification, and how precisely the result must be controlled. For appearance-critical work, agree the target with a physical mockup and have the contractor confirm the exact finishing sequence before placement.
This guide explains what each finish looks like, when it is made, how the main methods differ, and what to put in your specification. The cited NSW Government document applies to the construction specification it describes, while the Portland Cement Association (PCA) and Precast/Prestressed Concrete Institute (PCI) sources address broader slab and architectural-precast practices. Treat local codes and the project designer’s specification as controlling.
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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →What are the main concrete finish options?
The principal families are fresh-concrete textures, exposed-aggregate finishes, patterned or coloured finishes, and treatments applied after curing. A finish is not just a colour choice: it records the surface operation, its timing, the mix and aggregate, and the degree of uniformity required.
| Finish family | Surface character | When it is made | Typical control points |
|---|---|---|---|
| Broom, scored, sponge or float | Directional grooves, scratches, sand texture or a hand-floated surface | Fresh or green concrete, after initial floating and trowelling | Timing, tool, stroke direction and consistency |
| Steel-trowelled or burnished | Smooth consolidated surface; burnishing can be polished or glossy | Fresh concrete as it stiffens | Blade/trowel passes, timing and desired sheen |
| Exposed aggregate | Visible coarse stone with cement paste and sand removed to a chosen depth | While concrete is green or stiffened, or with a surface retarder; then washed or mechanically exposed | Aggregate selection, exposure depth, uniformity and mockup approval |
| Stamped and coloured | Patterned surface with integral or applied colour | While concrete is workable enough to receive the pattern | Pattern alignment, colour and release/finishing sequence |
| Abrasive blasted, acid-etched or polished | Revealed texture, etched appearance or smooth reflective surface | Generally after curing, although the exact system varies | Equipment, depth, substrate condition and sample approval |
The table is a planning aid, not a performance ranking. The supplied sources do not establish universal cost, durability, maintenance or safety rankings among finishes; obtain project-specific advice and current local quotations.
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How is a broom finish made?
A broom finish creates a coarse, even texture with grooves running across the slab. The NSW Government architectural specification describes drawing a broom or hessian belt over the surface after machine floating and steel trowelling. The tool category to discuss with a contractor is a concrete finishing broom; the important result is the specified, consistent texture rather than a particular product.
Timing is critical. The concrete must be firm enough that the broom forms a clean profile rather than tearing the surface, but workable enough to accept the marks. The specification describes a transversely scored surface, so state the direction in the documents when the visual pattern matters. Also identify whether edges, joints and returns receive the same treatment, because a sample in the middle of a slab does not show every transition.
Ask for a representative sample before the pour if the groove width, depth or visual regularity is important. Record the sample’s concrete mix, finishing sequence and weather conditions so the crew has a reference they can reproduce. Do not assume that a generic “broom finish” clause communicates the same texture to every contractor.
What is the difference between scored, sponge and wood-float finishes?
These are separate fresh-concrete treatments, even though all are made before the slab is fully cured. A scored or scratch finish is made by drawing a stiff brush or rake across the concrete before final set, producing deliberate linear marks. A sponge finish uses a damp sponge after floating and steel trowelling to produce an even sand-like texture.
A wood- or plastic-float finish uses a hand float to consolidate and texture the surface. The resulting appearance is different from a steel-trowelled surface, which is smoother and more tightly closed. Specify the tool and desired sample rather than relying on the word “smooth,” which can mean anything from hand-floated to burnished.
These finishes are sensitive to substrate condition and sequence. The contractor should confirm when machine floating, hand floating, steel trowelling and the final texturing pass occur, and how the method will be adjusted at perimeters or around penetrations. A written sequence helps prevent one area being textured while another is still receiving finishing passes.
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Choose a steel-trowelled finish when the specification calls for a smooth, consolidated surface. Burnishing is an extended steel-trowelling operation intended to produce a polished or glossy appearance. It should not automatically be called “polished concrete”: the NSW specification distinguishes steel-trowelled, burnished and polished finishes.
Because steel trowelling occurs as the concrete stiffens, the finish depends heavily on timing and the number of passes. Include the required visual sample and clarify whether a glossy burnished appearance is wanted or only a smooth matte surface. Confirm how the contractor will treat construction joints, day-work edges and repaired areas; those locations can read differently from the main field.
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If the design requires a cured, aggregate-revealing polish, specify that separately. Diamond grinding and polishing remove or refine cured concrete and are a different process from burnishing fresh concrete.
How does exposed aggregate work?
Exposed aggregate removes the surface skin of cement paste and sand so selected coarse aggregate becomes visible. The NSW specification describes scrubbing the surface while the concrete is green or has stiffened, then flushing with clean water until the aggregate is uniformly exposed. PCI also describes architectural-precast exposed aggregate made with a surface retarder. Confirm which system applies to your slab or precast element.
Exposure is a design variable, not an all-or-nothing treatment. The PCA guide defines three useful levels:
- Light exposure: remove the surface skin of cement and sand so only the edges of the uppermost coarse aggregate show.
- Medium exposure: remove enough paste and sand that exposed aggregate and mortar joints appear approximately equal in area.
- Deep exposure: remove enough paste and sand that coarse aggregate becomes the dominant surface feature.
The PCA guide recommends that exposure depth not exceed one third of the coarse aggregate diameter. That is guidance from the PCA document, not a universal code requirement; the designer and contractor must confirm the project-specific limit, mix and reinforcement conditions.
Why is a mockup important for exposed aggregate?
A preconstruction mockup is the most practical way to agree on aggregate colour, stone size, paste-to-stone balance and exposure depth before full production. The PCA calls mockups critical for choosing an acceptable final appearance and for comparison with the completed surface. A photograph cannot reliably show the same aggregate, light, sheen or exposure depth.
Require the mockup to use the proposed aggregate, cementitious materials, pigment (if any), finishing tools and exposure method. Label the approved face and keep it available for comparison during production. State what variation is acceptable: aggregate distribution, colour shifts, small differences at edges and the treatment of repairs should be addressed before work starts.
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For care, the PCA discusses clear coatings and sealers that can bring out aggregate colour and protect the exposed matrix. Examples include methyl methacrylate, silane and siloxane types. These are not blanket product recommendations. A concrete sealer for exposed aggregate can change colour, sheen and texture, so verify compatibility, preparation, slip-related project requirements and the desired appearance on the approved sample before application.
Can concrete be stamped or coloured?
Yes. The NSW specification identifies proprietary stamped and coloured pattern finishes and coloured applied finishes. Stamping impresses a pattern into workable concrete; colouring may be integrated into the concrete or applied as a finish, depending on the specified system. PCI likewise notes that architectural precast can be painted or stained.
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Specify the pattern, module, orientation, colour reference and treatment at joints and edges. A pattern that looks convincing in a small sample may require careful layout to avoid awkward cuts at walls, drains or penetrations. Ask the contractor to show a full-size sample or layout drawing where alignment is a major part of the design.
Colour consistency depends on the materials and sequence as well as the pigment. Keep the approved sample with the project records and identify the batch, aggregate and curing approach used for it. If an applied coating or stain is planned, clarify whether it is part of the finish specification or a later maintenance treatment.
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What are abrasive blasting, acid etching and polished concrete?
These are generally cured-surface treatments, although exact sequencing differs by system. Abrasive blasting mechanically removes or textures the surface. PCI lists abrasive-blasted and acid-etched surfaces among architectural-precast finishes. The NSW specification also identifies abrasive blasting and polishing by grinding cured concrete.
Acid etching must be handled with particular care because instructions differ by specification. Under the exposed-aggregate method in the cited NSW document, the instruction is explicit: “Do not use acid etching.” That is a method-specific requirement in that specification, not a universal prohibition on every concrete finish. Do not substitute an acid process for the specified mechanical or retarder method without written approval from the designer and confirmation that local requirements allow it.
Polishing uses grinding equipment, commonly diamond tooling, on cured concrete. The final look depends on how much material is removed, what aggregate is encountered and how far the surface is refined. Specify the target sheen or polish level, aggregate exposure (if any), edge treatment, repairs and sample approval. A polished finish is not interchangeable with a fresh-concrete burnish.
How do cast-in-place and architectural-precast finishes differ?
Cast-in-place slabs and architectural precast elements can share finish names but not necessarily the same production controls. The NSW source is an architectural construction specification for concrete work. PCI’s guidance focuses on architectural precast, including as-cast, acid-etched, abrasive-blasted, surface-retarded exposed aggregate, painted, stained and polished surfaces.
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For precast, ask the fabricator how the form face, release system, mould joints, lifting points and panel-to-panel colour variation will be controlled. For cast-in-place work, confirm the pour sequence, access, weather protection, curing and joint layout. In both cases, require a sample made with the actual materials and process, and identify which document governs if descriptions conflict.
How do I choose the right concrete finish for my project?
Start with the appearance and texture you need, then work backward to the process that can deliver it. Use this decision sequence:
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- Define the visual target. Decide whether the surface should read as directional and coarse, smooth and consolidated, stone-rich, patterned, etched, blasted or polished.
- Identify the element and exposure. State whether it is a cast-in-place slab, wall, stair, paving element or architectural precast panel, and identify the governing local specification.
- Choose fresh or cured work. Fresh textures require coordinated finishing while the concrete is workable. Blasting and polishing require cured concrete, equipment access and protection of adjacent work.
- Set appearance controls. Select aggregate, colour, pattern, exposure level and sheen. For exposed aggregate, use light, medium or deep terminology and approve a mockup.
- Resolve transitions. Detail joints, edges, penetrations, repairs, ramps, drains and interfaces with other materials. These are common locations for visible variation.
- Confirm maintenance and coating decisions. If a sealer, clear coat, stain or paint is planned, approve it on the finish sample and verify compatibility with the substrate.
- Obtain comparable quotes. Ask each contractor to price the same stated sequence, sample requirement, curing protection and acceptance criteria. The supplied sources do not support a universal cheapest or most durable finish.
What should a concrete finish specification include?
A useful specification removes ambiguity before the concrete arrives. Include:
- the finish name and a plain-language description of the target texture;
- the governing standard, project specification and whether the work is cast in place or precast;
- the concrete mix, coarse aggregate source or visual aggregate requirement, and any colour or pigment reference;
- the finishing sequence and timing, including floating, trowelling, brooming, scoring, scrubbing, retarder use, blasting or grinding;
- the required exposure category and the PCA guidance limit where exposed aggregate is specified;
- mockup size, location, materials, approval process and acceptable variation;
- joint, edge, penetration, repair and transition treatments;
- curing, protection and cleaning requirements;
- any sealer, clear coating, stain or paint, including compatibility checks and the intended sheen;
- inspection and acceptance criteria, including who decides whether the finished surface matches the approved sample.
Ask the contractor to provide method details before work starts, not just a finish label on a quotation. The method statement should identify equipment, crew sequence, weather contingencies and how the team will protect adjacent surfaces.
What can go wrong, and how can it be prevented?
Uneven exposed aggregate: inconsistent timing or washing can leave light and deep areas. Use a representative mockup, define the exposure category and require a uniformity check against the approved sample.
A finish that is smoother or rougher than expected: “smooth,” “polished” and “broomed” are interpreted differently. Name the tool, timing and visual target, and show the contractor a physical sample.
Confusing burnished with polished: burnishing is continued steel trowelling on fresh concrete; polishing is grinding cured concrete. Put the process and curing stage in the specification.
Pattern or colour inconsistency: layout, batching and application sequence affect the result. Approve the actual pattern and colour materials, and plan edges and joints before placement.
Unapproved acid treatment: the cited NSW exposed-aggregate clause says not to use acid etching. Confirm the governing specification before any chemical treatment and document written approval for a different method.
Coating changes the appearance: sealers can deepen colour or alter sheen. Apply a trial area on the approved finish and verify compatibility rather than selecting a product by name alone.
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What should I ask a concrete contractor before work starts?
Ask these questions in writing:
- Which finish process and timing will you use, and is the concrete cast in place or precast?
- Can you produce a mockup with the proposed mix, aggregate, colour and tools?
- For exposed aggregate, is the target light, medium or deep exposure, and how will depth be controlled?
- How will you treat joints, edges, penetrations, repairs and areas poured at different times?
- What curing and protection method will preserve the approved appearance?
- Is any sealer, coating, stain or paint included, and what sample demonstrates its final look?
- Which project specification governs, and who approves the completed surface?
- What variation is allowed between the mockup and production work?
Keep the approved mockup, finish schedule and method statement together. That record gives the project team a common reference if the completed surface is questioned.
Which concrete finish is best?
There is no single best concrete finish. Broom, scored, sponge and float finishes offer distinct fresh-textured appearances; steel trowelling and burnishing create smoother surfaces; exposed aggregate provides controlled stone visibility; stamped and coloured systems add pattern; and blasting or polishing alter cured concrete. Select the finish that matches the design intent and construction sequence, then lock down the appearance with a project-specific sample and written method.
For technical descriptions, compare the NSW Government concrete finishes specification, the Portland Cement Association guide to finishing slabs with colour and texture, and PCI’s architectural-precast finishes overview. Then confirm the local requirements, intended use, mix and contractor’s proposed sequence before approving the work.
Frequently Asked Questions
How early should a concrete finish mockup be made?
Make it before the production pour and early enough that the designer, owner and contractor can adjust aggregate, colour, exposure or sheen without delaying the work. Keep the approved sample available during production for direct comparison.
Can the same finish specification be used for a slab and a precast panel?
Not automatically. Similar names can describe different processes and tolerances; cast-in-place work and architectural precast have different forming, curing and joint controls. Identify the element type and governing specification in the documents.
Does a sealer preserve the exact look of exposed aggregate?
Not necessarily. Clear coatings and sealers can intensify aggregate colour or change sheen, and suitability depends on the actual substrate and desired appearance. Approve a trial area and verify compatibility before full application.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsIs acid etching always prohibited for concrete?
No universal rule can be inferred from the supplied sources. The cited NSW exposed-aggregate specification says, “Do not use acid etching,” but that instruction applies to its described method; another project must follow its own approved specification and local requirements.
How deep should exposed aggregate be?
The PCA guide describes light, medium and deep exposure and recommends that exposure depth not exceed one third of the coarse aggregate diameter. Treat that as guide advice and confirm the project-specific requirement with the design and construction team.
