What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
ThatPainter is reader-supported. When you buy through links on our site, we may earn an affiliate commission. Learn More
“Concrete cancer” is an informal label for concrete deterioration, not a single diagnosis. The term may refer to alkali-silica reaction (ASR), a chemical reaction within the concrete, or to damage associated with corrosion of embedded steel reinforcement. The distinction matters: these mechanisms have different causes and call for different investigations and repairs. Cracks, rust stains and loose concrete can raise concern, but appearance alone cannot confirm what is happening. If damage is structural, overhead or spreading, arrange a qualified assessment before painting, patching or removing material.
As an Amazon Associate I earn from qualifying purchases.
What does “concrete cancer” mean?
There is no single condition formally diagnosed as “concrete cancer.” The phrase is used in more than one way. A UK government design manual uses “so-called concrete cancer” for alkali-silica reaction, while the Australasian Corrosion Association uses the label in a discussion of concrete deterioration involving reinforcement corrosion. The manual distinguishes the two mechanisms, so the label by itself does not tell you what is wrong with a structure.
That ambiguity has practical consequences. ASR is a reaction involving susceptible aggregate, moisture and alkaline pore fluid inside the concrete. Reinforcement corrosion, by contrast, involves the loss of protection around embedded steel, often associated with carbonation or chloride ingress. Both can lead to cracking, but the repair plan depends on the cause, how far the damage has progressed and whether reinforcement is affected. Treat the phrase as a reason to investigate, not as a repair specification.
Popular on Amazon
- Great Value Paint Brush Set: Soucolor 20 acrylic paint brushes come in 10 different sizes, making them ideal for fine detailing, model painting, rock painting, nail art, face painting, DIY crafts, and general art projects. The varied brush sizes give you better control for both delicate lines and broader color coverage, while the soft bristles deliver smooth, consistent results on acrylic, oil, watercolor, canvas, wood, ceramic, and more.
- Awesome Set of Paint brushes: Professional paint brushes can cover all of your needs. The multi-purposed brushes are ideal for Watercolor, Oil, Gouache, enamel, Acrylic Painting, Body, Nail, Face Painting, Miniature, Model, Wood, Glass, Cup, Ceramic, Fine work, Art class, Craft Art Painting, DIY Art Crafts etc.
- Soft and long-lasting: The bristles are soft and strong, with nickel metal ferrules and blue wooden handles. After cleaning, the bristles will become soft and fluffy again and will not fall off.
- Easy to clean: it’s very convenient to Wash well in soap and water. Retain shape after drying. the brushes hold up very well. Nice selection to beginners and professionals. Keep them clean and they last a long time.
- Perfect for All Painters & Occasions: Suitable for art beginners, hobbyists and professional artists. Great for art class, home creation, travel painting and DIY handmade projects. A practical art gift for students, teachers, family and craft lovers.
For a painter or property owner, the useful first question is therefore not “Which concrete cancer product should I use?” It is “What mechanism is causing this damage, and has the concrete been assessed?” A coating or patch may change the visible surface without addressing a continuing reaction, corroding steel or the route by which moisture or contaminants are reaching the affected area.
How do ASR and reinforcement corrosion damage concrete?
ASR and reinforcement corrosion are different processes, even though their visible symptoms can overlap. Identifying which mechanism is present is essential before choosing a repair.
Alkali-silica reaction
In ASR, alkaline pore fluid in concrete reacts with susceptible forms of silica in the aggregate. The reaction can form a gel that absorbs water and expands. As the expansion builds, the concrete may crack. NIST describes a web-like pattern of fine fractures as one possible sign, but a crack pattern is a clue rather than a conclusive diagnosis.
Moisture is relevant to the reaction, but that does not mean every damp or cracked concrete surface has ASR, or that drying a surface is a complete repair. NIST’s account includes laboratory research and a specific case at a nuclear power plant. Moisture management mattered in that case, but it should not be treated as a universal prescription for other buildings. A specialist needs to consider the concrete, aggregate, cracking pattern and progression together.
ASR can be slow. In the NIST account, structural engineer Long Phan, who led the study, said: “This is a slow process that takes years or even decades,” and “But it gets worse over time, and the damage is irreversible.” Those statements refer to ASR in the context of the study; they are not a description of every type of concrete deterioration.
Also popular on Amazon
- COMPLETE 5-PIECE BRUSH SET FOR EVERY PAINTING TASK — Includes 1 Inch Flat, 1.5 Inch Angle, 2 Inch Flat, 2 Inch Angle Stubby, and 2.5 Inch Angle brush giving you every size professional painters use daily. Get all 5 for less than the price of a single brush from hardware store brands — professional grade performance at a fraction of the cost. Perfect for walls, trim, cabinets, doors, furniture, and detailed cutting-in work on any project.
- ZERO BRISTLE LOSS — GUARANTEED BY PRECISION ADHESIVE BONDING — Every bristle is locked in place with precision-set adhesive that keeps them in the brush — not in your paint job. The coated steel ferrule provides structural support while the adhesive bond ensures clean performance on every stroke. Premium SRT synthetic filaments load more paint and release it evenly for a smooth streak-free finish on walls, ceilings, and trim. Works with latex, oil-based paint, primer, sealer, and wood stain.
- INCLUDES THE ANGLE STUBBY MOST SETS LEAVE OUT — Professional painters know the 2 Inch Angle Stubby is the go-to brush for tight cabinet interiors, window sashes, inside corners, and detailed trim where standard angle brushes are too long. Combined with the 1.5 and 2.5 inch angle sash brushes you have precision cutting-in covered at every scale — baseboards, crown molding, door casings, and ceiling lines.
- FLAT BRUSHES FOR BROAD SMOOTH COVERAGE ON ANY SURFACE — The 1 and 2 inch flat brushes deliver even coverage on walls, furniture, shelving, doors, fences, decks, and wood surfaces. Ideal for applying primers, stains, varnishes, polyurethane, and specialty coatings. Solid wood handles provide all-day comfort and control for both professional contractors and weekend DIY homeowners tackling interior or exterior painting projects.
- TRUSTED BY PROFESSIONAL PAINTERS AND CONTRACTORS NATIONWIDE — Pro Grade delivers professional-grade results at a price that makes sense for crews who go through brushes on every job. Ideal for property managers, remodeling contractors, apartment turnover crews, maintenance teams, and commercial painting operations. Backed by thousands of verified reviews from working painters. Washable and reusable for multiple projects.
Corrosion of reinforcement
Steel reinforcement embedded in sound concrete is protected by a passive film. Carbonation or chloride ingress can undermine that protection; when oxygen and moisture are present, corrosion can follow. This process may develop inside the concrete before there is an obvious surface sign. As corrosion products form, they can contribute to cracking and spalling—the breaking or flaking away of concrete.
A rusty mark or a piece of loose concrete can be consistent with reinforcement corrosion, but neither proves it. There can be other causes of concrete deterioration, and visible damage may not show the full extent of a problem hidden within the member. The Australasian Corrosion Association’s overview of concrete corrosion and remediation explains why diagnosis and repair need to address the steel and the concrete around it, not just the surface finish.
Windows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallOutdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchWhat signs should prompt an assessment?
Cracks, rust staining and spalling are reasons to seek an assessment, especially if they are changing or occur where reinforcement may be present. They are not enough to identify the cause or establish whether a structure is safe.
- Fine, connected or web-like cracking: this can be one possible sign of ASR, as described by NIST, but it is not a diagnosis by itself.
- Rust stains, cracks over reinforcement, or concrete breaking away: these can be clues to corrosion-related damage. Corrosion may be developing internally before the surface shows obvious cracking or spalling.
- Cracking that appears to be progressing: record where it is and whether it changes, and pass that information to the professional assessing the concrete. Do not infer the underlying reaction from the pattern alone.
- Loose, detached or overhead concrete: treat it as a potential safety issue. Do not chip it away or work beneath it as a DIY repair.
Different deterioration processes can produce overlapping symptoms. The UK government design manual distinguishes reinforcement corrosion from ASR, and NIST likewise presents cracking as a matter for scientific investigation rather than visual guesswork. The condition and risk of any particular building cannot be established from a general description or photograph.
How is the cause diagnosed?
Diagnosis means establishing both the likely mechanism and the extent of the damage before selecting a repair. A qualified concrete or structural specialist can assess the affected area in context; a paint inspection or a surface patch cannot establish whether the problem is ASR or corrosion.
Also popular on Amazon
- 【All sizes of art brushes】: The 10 sizes of multi-functional brushes have various shapes, making the mixing color easier, which is very suitable for artists, students, teenagers, children and painters at all levels. Wonderful Present ideas for friends and family who like painting!
- 【general brush set】: Professional paint brush can meet all your needs. Multifunctional brush is very suitable for watercolor, oil, gouache, acrylic painting, body, nail, face painting, miniature, model, ceramics, arts and crafts painting, etc.
- 【high quality process】: It is designed with anti falling bristles, anti-rust nickel ferrule and solid wood handle. You can use the brush to focus on the painting and always be creative.
- 【easy to maintain】: After using the brush, it is very convenient to clean the brush with warm soapy water and reshape the tip of the brush. Air dry the brush and place it on top of the top for long use.
- 【100% satisfaction guarantee - buy now】1 packs of set brushes, you can also get friendly customer service, any questions feel free to contact us, within 24 hours to help you! There is no risk in buying our paint brush kit.
- Describe the observed damage. Note where cracks, stains or spalling occur and whether the visible condition appears to be changing. This information helps direct an assessment, but it does not identify the mechanism.
- Consider the competing explanations. For suspected ASR, the assessment needs to consider moisture, susceptible aggregate, and the pattern and progression of cracking. For suspected reinforcement corrosion, it needs to consider the condition of the embedded steel and possible carbonation or chloride exposure.
- Establish how much material and reinforcement are affected. A repair depends on the extent of unsound concrete and the condition of the steel, not only on the visible surface area. The sources do not provide a universal field test or a one-size-fits-all diagnostic sequence; the investigation should be selected by the responsible specialist for the structure and jurisdiction.
- Agree the repair objective. The plan should identify what damaged material must be addressed, how reinforcement will be treated if affected, how the concrete will be reinstated, and how further moisture or contaminant ingress will be reduced where relevant.
Do not treat a general symptom checklist as a substitute for that assessment. The evidence reviewed here does not establish a diagnosis, safety status or repair scope for any particular building, and local codes and professional requirements vary.
How is concrete cancer repaired?
There is no universal fix for “concrete cancer”: repairs must match the diagnosed mechanism and the extent of damage. For corrosion-related damage, options may include removing unsound concrete, treating or replacing affected reinforcement, reinstating concrete with a suitable repair mortar and applying a protective system. ASR needs a mechanism-specific assessment; a corrosion repair recipe should not be applied to it by default.
When reinforcement corrosion is confirmed
The Australasian Corrosion Association describes several elements that may form part of a corrosion repair. Depending on the condition and repair design, these can include:
- Removing unsound concrete far enough to expose affected reinforcement.
- Cleaning and treating the steel, or replacing it where required by the repair plan.
- Reinstating the concrete with a suitable specialist repair mortar.
- Using a coating or other protective system to reduce further ingress.
- Considering cathodic protection as a specialist intervention where appropriately designed.
These are possible components, not a universal sequence or a DIY instruction. The required concrete removal, reinforcement treatment and protective measures depend on the assessment. A repair mortar must match the repair specification; the generic product category alone does not establish suitability. Cathodic protection also requires appropriate specialist design rather than an improvised installation.
When ASR is suspected
ASR involves a chemical reaction within the concrete, so a surface patch or corrosion treatment does not by itself establish that the underlying reaction has been addressed. The assessment should consider moisture, potentially susceptible aggregate and the cracking pattern and progression. NIST’s Seabrook example discusses moisture management in that specific case; it is not evidence that one moisture-control measure will repair ASR in every structure. Repair decisions should follow the specialist’s findings and account for the particular concrete and site.
The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Also popular on Amazon
- 【KIDS PAINT BRUSHES SET】Anezus paint brushes for kids come with 10 pcs paint brushes of 5pcs round paintbrushes and 5 flat paint brushes with colorful handles, good for the young artist to explore their creativity in painting and crafting
- 【HIGH QUALITY PAINT BRUSHES FOR KIDS】These toddler paint brushes made of soft hog bristle, bright colored handles and rust proof ferrules. The bristles are firmly fixed in the kids paint brushes and no shedding. Each children paint brush measure 6 1/4 inches (16cm) in length and ferrules 1/2"(1.3cm) diameter, large enough for the little hand to grip and control
- 【WIDE APPLICATIONS】With combination of round and flat craft paint brushes for kids, work great with washable paint, tempera paint and acrylic paint. Great for arts and craft, rock, leather, gesso and ceramic, or body, nail and face art painting.
- 【EASY TO CLEAN 】After using paint brushes for acrylic, oil or watercolor painting, it’s very convenient to clean them with warm soapy water and reshape the paint brush tips. Keep these craft paint brushes clean and they last a long time.
- 【GREAT GIFT IDEA】Perfect for students, teens, kids, children and painters of all levels. Wonderful gift idea for girls, boys and kids who love painting! These all-purpose paint brushes for kids are ideal for kids' school projects, birthday parties, painting parties, art parties, back to school supplies, classroom decoration and more.
Why the repair choices are not interchangeable
A repair designed around corroding steel may involve exposing and treating reinforcement; an ASR assessment focuses on a chemical reaction involving aggregate and moisture. Choosing the wrong approach can leave the actual cause in place. Even when corrosion is confirmed, a mortar patch alone may not address the condition of steel beyond the visible damaged spot or prevent further ingress. The appropriate combination of removal, steel work, reinstatement and protection must come from the repair design.
Can you paint or coat over the damage?
Paint is not a diagnosis or a structural repair. Coating over cracks, rust staining or spalled concrete can conceal visible clues without establishing whether ASR, reinforcement corrosion or another deterioration process is responsible. Do not use a decorative finish as a substitute for assessment or as proof that the cause has been corrected.
Protective coatings may be part of a properly designed corrosion-control system, according to the Australasian Corrosion Association. That is different from applying ordinary paint over a damaged surface: the system needs to be selected for the repair specification and the aim of reducing further ingress. A painter should coordinate with the professional responsible for the concrete repair, and apply a finish only after the repair requirements and surface readiness have been established.
If your role is limited to painting, flag the observed condition and avoid covering it until the owner or responsible professional has decided whether assessment or repair is needed. For loose, overhead or potentially structural damage, do not scrape, drill, patch or work underneath the affected area.
Free tools Windows power users keep installed
One-click scans. No signup required.
How should you compare repair options?
Compare options only after the cause and extent have been assessed. The relevant trade-offs are the diagnosed mechanism, the amount of concrete removal, whether reinforcement needs treatment or replacement, how moisture or contaminants will be controlled, and the design and maintenance needs of any protective system.
Also popular on Amazon
- 【162-Piece Bulk Set | Dual Brush System】Maximize versatility with 81 flat brushes (0.59 inch edge for bold strokes) and 81 round brushes (0.39 inch tips for details) – 3X more tools than standard kits! Pre-sorted in labeled compartments for instant access during painting sessions. Ideal for art classrooms, mural projects, and multi-artist households.
- 【Pro-Grade Durability | Zero Shedding Guarantee】 "Engineered with triple-crimped nylon bristles (43% higher resilience vs. standard) and aerospace aluminum ferrules tested for 10,000+ flex cycles. Lab-verified 0.01% shedding rate even with heavy impasto techniques – outperforms flimsy bristles in budget brushes."
- 【Multi-Scenario Readiness | Event & Daily Use】 Optimized for: Thanksgiving/Christmas face designs classroom projects ceramic decorating fabric printing and model painting; Lightweight plastic handles each reduce hand fatigue during prolonged sessions
- 【Effortless Maintenance | Long-Term Durability】 Clean with warm soapy water in 10 seconds; Reshape tips and air-dry vertically to preserve bristle integrity，After use, air-dry brushes thoroughly and store upright in the provided case to preserve bristle shape. The premium nylon filaments naturally regain their original form after each stroke. For cleaning, simply rinse in warm soapy water and gently reshape bristles with fingertips."
- 【Multiple Application】These acrylic paint brushes can be applied for most occasions,such as:watercolor,oil, gouache paint,face paint, acrylic paint, suitable for Thanks Giving Day, Christimas, Halloween face and body painting, canvas painting, fabric, rock, miniature, model, ceramics, arts and crafts painting, etc.
| Decision point | What to establish | Why it matters |
|---|---|---|
| Mechanism | Is the damage associated with ASR, reinforcement corrosion, or another process? | The repair for one mechanism should not be assumed to solve another. |
| Extent | How much concrete is unsound, and is reinforcement affected? | This determines the scope of removal, steel work and reinstatement. |
| Steel repair | Does affected reinforcement need cleaning, treatment or replacement? | A surface-only patch may not address damaged embedded steel. |
| Ingress control | How will relevant moisture or contaminants be managed? | Protection should address the factors relevant to the diagnosed process. |
| System requirements | What design, installation and maintenance does a protective system require? | Options such as cathodic protection are specialist interventions, not simple coatings. |
The available source describes corrosion-control approaches but does not establish a universal cost ranking or a head-to-head comparison. Costs, applicable standards and professional requirements depend on the site and jurisdiction; get a project-specific scope rather than choosing by a generic label or the apparent size of the surface patch.
What should you do next?
If you have noticed possible “concrete cancer,” preserve the evidence and get the right level of assessment before repair. Do not wait for a paint job to reveal whether the cause has been fixed.
- Keep clear of immediate hazards. If concrete is loose, overhead or appears to affect a structural element, keep people away from the area and contact the property owner or responsible building professional promptly.
- Document, without disturbing, what you can see. Record the location and visible changes. Avoid removing concrete, exposing reinforcement or applying a patch or coating to investigate.
- Ask for a cause-and-extent assessment. Explain whether you are concerned about ASR, reinforcement corrosion or are unsure. The assessment should distinguish likely mechanisms and establish whether steel or surrounding concrete is affected.
- Request a repair scope tied to the findings. It should say what material will be removed, whether reinforcement work is needed, what reinstatement material is specified and how further ingress or the relevant deterioration mechanism will be addressed.
- Coordinate painting after repair decisions. Confirm with the repair professional whether a coating is part of the designed protection system or whether a separate decorative finish is appropriate, and follow the specified surface preparation and timing.
For background on the mechanisms, see NIST’s explanation of ASR and cracking, the Australasian Corrosion Association’s guide to corrosion repair approaches, and the UK manual’s distinction between ASR and reinforcement corrosion. MPA Cement’s ASR fact sheet was last revised on 25 March 2013; it is useful for historical guidance, not a current incidence statistic or a substitute for project-specific requirements.
Frequently Asked Questions
Can concrete cancer make a building unsafe?
It can be associated with damage to concrete and embedded reinforcement, but the phrase alone cannot indicate the severity or safety of a particular building. If concrete is loose or overhead, keep clear and have the condition assessed promptly.
Can a photo tell whether cracks are caused by ASR or rusting steel?
A photo may document the visible pattern, but it cannot establish the full condition of concrete or hidden reinforcement. The two mechanisms can produce overlapping clues, so diagnosis should consider the material and site context.
Does sealing a crack stop alkali-silica reaction?
A sealant over a crack does not, by itself, demonstrate that an internal ASR process has been diagnosed or controlled. Moisture management was relevant to a specific case discussed by NIST, but the source does not establish a universal sealing remedy.
Is the term “concrete cancer” used consistently in building reports?
No. The UK design manual uses it for ASR, while the Australasian Corrosion Association discusses deterioration involving reinforcement corrosion under the same label. A useful report should name the suspected mechanism rather than rely on the informal phrase.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Quick Recap
