Concrete repair products are 12 product classes, from R1 to R4 repair mortars, patching compounds and crack fillers to rebar coatings, galvanic anodes, FRP and shotcrete, that restore damaged concrete, protect its reinforcement and strengthen structural members. Each class answers a different defect and load, so which one does a spalled beam, a cracked slab or a corroding deck need?
The 12 classes fall into 4 groups: repair mortars and patching materials, crack and leak repair materials, reinforcement corrosion protection, and strengthening and sprayed concrete. UK specifiers write "concrete repair" to BS EN 1504-3:2005, and the European standard series calls the family "products and systems for the protection and repair of concrete structures". Concrete repair is one of the 15 families of construction chemicals.
EN 1504-3:2005 sets the structural classes R4 at 45 MPa (6,527 psi) and R3 at 25 MPa (3,626 psi), while US practice rests on ASTM C928/C928M-25, ASTM C881/C881M-20a and ACI CODE-562-25. Spalling or scaling repair of residential flatwork costs USD 32 to 54 per m² (USD 3 to 5 per ft²) installed in the US (HomeGuide, 2025-12).
Standards, codes and regulations are checked against their issuing bodies, product values against the named data sheet and prices against the dated source named in the sentence; see our methodology and fact-checking.
What Are Concrete Repair Products?#
Concrete repair products are factory-formulated mortars, resins, coatings, anodes and composites that replace damaged or contaminated concrete, stop reinforcement corrosion or add load capacity to an existing structure.
Repair mortars come in 3 binder types under EN 1504-3:2005: cementitious (CC), polymer-modified cementitious (PCC) and resin-bound polymer (PC), such as epoxy, and the classes R1 to R4 apply to all three. Around the mortars sit rapid-hardening cements, zinc galvanic anodes, carbon or glass fiber bonded with epoxy (CFRP, GFRP) and sprayed concrete.
What does a concrete repair system include besides the repair material?#
A concrete repair system includes 5 parts besides the repair material, listed below.
- Condition survey, which locates corrosion, chlorides and carbonation before any concrete is removed.
- Concrete removal and surface preparation, with the removal around corroded bars set by ICRI 310.1R-2008.
- Bar cleaning and a rebar coating, an EN 1504-7:2006 product that protects the cleaned steel inside the patch.
- Bond or scrub coat, a layer of the same mortar worked into the prepared, saturated substrate.
- Curing and, for R1 or R2 mortars where carbonation protection is needed, an EN 1504-2:2004 surface protection.
How Do Concrete Repair Products Work? The EN 1504-9 Principles#
Concrete repair products work by 3 routes in EN 1504-9:2008: they restore the concrete (principle 3), strengthen the member (principle 4) and protect the reinforcement by passivity, cathodic protection or control of anodic areas (principles 7, 10 and 11). EN 1504-9:2008 defines 11 principles in total, 6 for concrete defects and 5 for reinforcement corrosion, and each principle groups numbered methods that the product parts refer to.
Restoring concrete section and profile#
Repair mortars, rapid-hardening mortars, epoxy mortars and shotcrete restore lost section by hand application, recasting or spraying (EN 1504-3:2005 methods 3.1, 3.2 and 3.3). Recasting pours a flowable mortar or concrete into formwork, and spraying projects it onto large or overhead areas.
The same standard covers 2 methods that protect the steel through the concrete itself: method 7.1 increases the cover over the reinforcement, and method 7.2 replaces contaminated or carbonated concrete down to sound material. Only the structural classes R3 and R4 must pass the carbonation-resistance test of EN 1504-3:2005.
Protecting reinforcement against corrosion#
Reinforcement corrodes once chlorides or carbonation remove the passivity of the steel, and repair products answer at 3 levels: rebar coatings in the patch, inhibitors on the surface and anodes that supply protective current. EN 1504-9:2008 names the matching principles: 7 preserving or restoring passivity, 8 increasing resistivity, 9 cathodic control, 10 cathodic protection and 11 control of anodic areas, with method 11.1 for active coatings, 11.2 for barrier coatings and 11.3 for inhibitors applied to the concrete.
Galvanic anodes work under principle 10: zinc corrodes preferentially and supplies current to the bars around a patch. Corrosion-inhibiting admixtures added to new concrete are covered on concreteadditives.net. Concrete carbonation lowers the pH of the pore solution until the steel loses its passive film; its depth and testing are covered under concrete carbonation.
Strengthening members with FRP and added concrete#
FRP systems add tensile capacity in the fiber direction, while sprayed or cast concrete adds section (EN 1504-3:2005 method 4.4). Fiber-reinforced polymer is bonded with epoxy to the tension face for flexure, to the sides for shear or around a column as a hoop wrap for confinement, and a registered design professional designs every FRP strengthening. Structural bonding of plates and added mortar falls under EN 1504-4:2004.
12 Types of Concrete Repair Products in 4 Groups#
The 12 types of concrete repair products fall into 4 groups: 5 repair mortars and patching materials, 2 crack and leak repair materials, 3 reinforcement corrosion protection classes and 2 strengthening and sprayed concrete classes. The group table below compares the classes, the EN 1504-9:2008 principles each group serves and the basis on which its quantity is specified.
| Group | Classes | EN 1504-9:2008 principle | Quantity basis |
|---|---|---|---|
| Repair mortars and patching | repair mortars, rapid-hardening mortars, epoxy mortars, patching compounds, resurfacers | 3 concrete restoration (methods 3.1 to 3.3); 7 passivity (methods 7.1, 7.2); 4 strengthening (method 4.4) | per layer depth |
| Crack and leak repair | crack fillers, hydraulic cement plugs | 1 protection against ingress; 3 concrete restoration | per linear m of crack |
| Reinforcement corrosion protection | rebar coatings, corrosion inhibitors, galvanic anodes | 11 control of anodic areas (methods 11.1, 11.2, 11.3); 10 cathodic protection | per bar, per m² or by anode spacing |
| Strengthening and sprayed concrete | FRP systems, shotcrete | 4 structural strengthening; 3 concrete restoration (method 3.3 spraying) | per ply or per layer |
1. Repair mortars and patching materials (5)#
Repair mortars and patching materials are cementitious, polymer-modified or resin-bound products that fill and reprofile damaged concrete; this group has 5 classes: concrete repair mortars, rapid-hardening repair mortars, epoxy mortars and polymer concrete, concrete patching compounds and concrete resurfacers. Only the first 3 carry structural duty.
Concrete repair mortars#
Concrete repair mortars are cementitious (CC) or polymer-modified (PCC) mortars classed R1 to R4 by EN 1504-3:2005, where R4 and R3 are structural and R2 and R1 non-structural. Concrete Society TR 69 notes that manufacturers are likely to produce pre-bagged formulated mortars only in the 2 strongest grades, R4 and R3.
Rapid-hardening repair mortars#
Rapid-hardening repair mortars are packaged dry cementitious mortars or concretes that return pavements, decks and ramps to traffic within hours. ASTM C928/C928M-25 covers them and excludes organic binders such as bitumen, epoxy and polymers; a material counts as concrete once 5 % or more by mass is retained on the 9.5 mm (3/8 in) sieve. Rapid-hardening cement chemistry is covered on cementadditives.org.
Epoxy mortars and polymer concrete#
Epoxy mortars and polymer concrete are resin-bound (PC) mortars of amine-cured epoxy, filler and sand that harden without hardening shrinkage and resist chemicals. EN 1504-3:2005 classes them up to R4 and exempts them from the carbonation test, ASTM C579-23 tests their compressive strength, and ACI 548.5R-16 covers polymer overlays thinner than 25 mm (1 in).
Concrete patching compounds#
Concrete patching compounds are premixed acrylic latex fillers or cement-polymer powders for shallow, cosmetic defects. They carry no structural or carbonation performance, and the highest class open to them is EN 1504-3:2005 R1, which requires at least 10 MPa (1,450 psi). Once a defect turns structural, the job moves to a repair mortar.
Concrete resurfacers#
Concrete resurfacers are thin layers of portland cement, redispersible polymer powder and fine sand that restore worn but sound flatwork. No product standard covers them. They do not bridge moving cracks or joints, which show through the new surface as reflective cracking.
2. Crack and leak repair materials (2)#
Crack and leak repair materials are liquids and fast-setting cements that seal cracks or stop running water; this group has 2 classes: concrete crack fillers and hydraulic cement plugs. Both deal with water paths, not with lost section.
Concrete crack fillers#
Concrete crack fillers are gravity-fed liquids of low-viscosity epoxy, high molecular weight methacrylate (HMWM), 2-component polyurethane or latex for dormant cracks. Epoxy fillers follow ASTM C881/C881M-20a Type I or II, Grade 1, which allows at most 2,000 cP (2,000 mPa·s). A rigid filler in a moving crack re-cracks.
Hydraulic cement plugs#
Hydraulic cement plugs are blends of portland cement, graded sand and accelerators that set against running water in a hole or crack. No plug standard exists: ASTM C1157/C1157M-25 is a performance specification for hydraulic cement, not a test of water-stop plugs. A plug stops the leak; it does not reprofile a wall.
3. Reinforcement corrosion protection (3)#
Reinforcement corrosion protection products are coatings, liquids and anodes that slow or stop the corrosion of steel in concrete; this group has 3 classes: rebar corrosion protection coatings, surface-applied corrosion inhibitors and galvanic anodes. They serve EN 1504-9:2008 principles 10 and 11.
Rebar corrosion protection coatings#
Rebar corrosion protection coatings are cement slurries, epoxy-cement hybrids or zinc-rich epoxies applied to cleaned bars inside a patch. Active coatings inhibit corrosion through pigments or cement alkalinity, while barrier coatings isolate the steel. EN 1504-7:2006 tests them with EN 15183 for corrosion and EN 15184 for bond, which must reach at least 80 % of the uncoated reference bar at 0.1 mm displacement.
Surface-applied corrosion inhibitors#
Surface-applied corrosion inhibitors are amino-alcohol or amine-carboxylate liquids that migrate from the concrete surface to the steel. EN 1504-9:2008 recognizes them as method 11.3, but no EN 1504 part sets product requirements. Sprinkel, Virginia Transportation Research Council, 2003 (VTRC 03-R14), found no measurable corrosion reduction in test slabs at 3 to 10 lb/yd³ (1.78 to 5.93 kg/m³) chloride.
Galvanic anodes#
Galvanic anodes are high-purity zinc cast in an alkali- or halide-activated mortar and tied to the reinforcement, working under EN 1504-9:2008 principle 10. ISO 12696:2022, the third edition, limits the anode current density to 220 mA/m² short-term and 110 mA/m² long-term. Its clause 6.1 note states that unmonitored galvanic systems do not comply.
4. Strengthening and sprayed concrete (2)#
Strengthening and sprayed concrete products add capacity or section to a member; this group has 2 classes: FRP strengthening systems and shotcrete and sprayed repair mortars. Both need design input and trained crews.
FRP strengthening systems#
FRP strengthening systems are carbon, glass or aramid fibers in an epoxy matrix, applied as wet-layup fabric, precured laminates or near-surface-mounted bars. ACI PRC-440.2-23 (109 pages) guides the design, ACI CODE-440.13-24 (57 pages) sets code requirements, and ICC-ES AC125 (April 2025) governs US evaluation reports. Installation is checked by special inspection under ICC-ES AC178.
Shotcrete and sprayed repair mortars#
Shotcrete and sprayed repair mortars are concretes or mortars projected at high velocity and consolidated by impact, with little or no formwork. EN 14487-1:2022 and ACI SPEC-506.2-13 (reapproved 2018) govern them, and ACI 506R-16 defines structural shotcrete by a specified f'c of at least 28 MPa (4,000 psi). Shotcrete accelerators and fibers are covered on concreteadditives.net.
How to Select a Concrete Repair Product by Defect, Depth and Load#
A concrete repair product is selected by 3 questions: does the repair carry structural load, is the reinforcement corroding, and how fast must the area return to service; the answers point to a class and its governing document. The verdict table below pairs each defect or need with its class, the governing document and the key requirement that document sets; a specification should name the class and the document, not a product.
| Defect or need | Class | Governing document | Key requirement (standard, not product) |
|---|---|---|---|
| Structural spall, reinforced | concrete repair mortar R4 or R3 | EN 1504-3:2005 | R4 at least 45 MPa (6,527 psi), bond at least 2.0 MPa (290 psi); R3 at least 25 MPa (3,626 psi), bond at least 1.5 MPa (218 psi) |
| Return to traffic within hours | rapid-hardening repair mortar | ASTM C928/C928M-25 | classes R1 to R3 by early strength; organic binders excluded |
| Thin, chemical-resistant patch | epoxy mortar | EN 1504-3:2005 R4 (PC); ASTM C579-23 | carbonation test exempt |
| Cosmetic shallow defect | patching compound | EN 1504-3:2005 R1 at most | at least 10 MPa (1,450 psi) |
| Worn but sound flatwork | resurfacer | none specific | not over moving cracks |
| Dormant crack | crack filler | ASTM C881/C881M-20a Type I or II, Grade 1 | static cracks only |
| Running leak | hydraulic cement plug | none (ASTM C1157/C1157M-25 is a cement specification) | stop the water first |
| Cleaned bars in a patch | rebar coating | EN 1504-7:2006 | bond at least 80 % of reference (EN 15184) |
| Corrosion without concrete removal | corrosion inhibitor | EN 1504-9:2008 method 11.3 | no EN 1504 product part |
| Chlorides beyond the patch | galvanic anodes | ISO 12696:2022 | anode current density at most 110 mA/m² long-term |
| Added capacity | FRP | ACI PRC-440.2-23, ACI CODE-440.13-24, ICC-ES AC125 | design by a registered design professional |
| Large areas, overhead | shotcrete | EN 14487-1:2022, ACI SPEC-506.2-13 (reapproved 2018) | structural f'c at least 28 MPa (4,000 psi) (ACI 506R-16) |
Structural vs non-structural repair classes R1 to R4#
EN 1504-3:2005 splits repair mortars into structural classes R4 and R3 and non-structural classes R2 and R1, and only R4 and R3 must match concrete in stiffness and carbonation resistance. R4 requires at least 45 MPa (6,527 psi) compressive strength (EN 12190), 2.0 MPa (290 psi) adhesive bond (EN 1542) and a 20 GPa (2.9 x 10^6 psi) elastic modulus (EN 13412). R3 requires 25 MPa (3,626 psi), 1.5 MPa (218 psi) and 15 GPa (2.18 x 10^6 psi).
R2 and R1 require 15 MPa (2,176 psi) and 10 MPa (1,450 psi) with 0.8 MPa (116 psi) bond each and no modulus. Chloride ion content stays at most 0.05 % in all 4 classes (EN 1015-17), capillary absorption at most 0.5 kg·m⁻²·h⁻⁰·⁵ for R2 to R4 (EN 13057), and carbonation resistance applies to R3 and R4 only, with PC mortars exempt.
Footnote g of EN 1504-3:2005 adds that R1 and R2 do not protect against carbonation unless the system includes an EN 1504-2 surface protection with proven carbonation protection. A structural spall over reinforcement should therefore take R3 or R4.
EN 1504-3 R3 vs ASTM C928 R3: two different classes#
EN 1504-3 class R3 is a structural repair class tested at 28 days, while ASTM C928 Type R3 is a rapid-hardening class, and one does not imply the other. The European R3 sets a 25 MPa (3,626 psi) floor plus bond, modulus and carbonation limits. ASTM C928/C928M-25 instead sorts packaged dry cementitious repair materials into classes R1 to R3 by early strength, so a product can be fast but not structural, or structural but slow.
A parking deck closed overnight may need a C928 class for the return to traffic and an EN 1504-3 class for the structural duty. A data sheet that prints "R3" without the standard number leaves the question open; the declaration of performance (DoP) or the ASTM test report settles it.
Where Are Concrete Repair Products Used? Structures and Defects#
Concrete repair products are used on 5 kinds of work (spalled and corroded members, cracked and leaking concrete, parking and bridge decks, marine structures and residential flatwork), and the defect sets the class before the structure does. The applications table below links each structure or defect to the classes that answer it and the rule that governs the choice.
| Structure or defect | Classes | Key rule |
|---|---|---|
| concrete spalling | repair mortars, rebar coatings, galvanic anodes | ICRI 310.1R-2008 removal around corroded bars |
| concrete crack repair | crack fillers, injection resins | dormant vs moving cracks |
| basement waterproofing | hydraulic cement plugs, crack fillers | stop running water first |
| parking structure repair | rapid-hardening and R4 mortars, galvanic anodes, FRP | ICRI 310.2R-2013 CSP range |
| bridges, tunnels and marine structures | R4 mortars, galvanic anodes, shotcrete, FRP | ISO 12696:2022 |
| Driveways, steps and walkways | resurfacers, crack fillers, repair mortars | dated installed ranges, US, 2025-12 and 2026-02 (below) |
Spalled and corroded concrete#
Spalled concrete over corroding bars takes a structural repair mortar, a rebar coating and, where chlorides stay in the surrounding concrete, galvanic anodes against the halo effect. Without anodes, the steel next to a fresh patch can become the new anode (the halo or ring-anode effect).
Removal around the corroded bars follows ICRI 310.1R-2008, and the mortar class follows the load. Rebar corrosion in concrete forms rust that occupies more volume than the steel and spalls the cover; the chloride and carbonation mechanisms are explained under rebar corrosion in concrete.
Cracks and active leaks#
Dormant cracks take gravity-fed crack fillers, moving or leaking cracks take injection resins, and running water through a hole takes a hydraulic cement plug first. A rigid epoxy filler bonds the faces of a crack that no longer moves; the same filler in a moving crack re-cracks beside the repair. Asphalt and blacktop crack fillers are covered on asphaltadditives.net.
Parking structures, bridges and marine structures#
Parking decks and bridges take rapid-hardening or structural repair mortars, galvanic anodes and FRP, because closures are short and chlorides from de-icing salts or seawater drive corrosion. Surface preparation to a specified ICRI 310.2R-2013 CSP range and anode design to ISO 12696:2022 apply to both.
Marine concrete repair adds tidal access windows and permanent chloride exposure to the same product set, with shotcrete for large areas and anodes for the splash zone. Splash-zone methods and access are covered under marine concrete repair.
Driveways, steps and walkways#
Residential flatwork takes resurfacers for worn but sound slabs, crack fillers for dormant cracks and repair mortars for spalled edges and steps. Spalling or scaling repair of residential flatwork costs USD 32 to 54 per m² (USD 3 to 5 per ft²) installed in the US (HomeGuide, 2025-12), or USD 1,800 to 4,200 for a 56 m² (600 ft²) driveway.
Resurfacing suits a sound slab only: over moving cracks or a settled slab, the cracks reflect through the new layer. Further installed US ranges in the table below come from the same cost guide, dated 2025-12 and 2026-02.
Which Standards and Codes Govern Concrete Repair Products?#
Concrete repair products are governed in 3 layers: European product standards with CE marking, US material specifications and repair codes, and guides and test methods for preparation and acceptance. The European layer is EN 1504 parts 2 to 7; the US layer includes ASTM C928, ASTM C881 and ACI CODE-562-25; the acceptance layer includes the ICRI guides, ASTM C1583 and EN 1542.
EN 1504 parts and CE marking under the CPR#
Six EN 1504 parts are harmonised for CE marking (EN 1504-2:2004, -3:2005, -4:2004, -5:2004, -6:2006 and -7:2006), while parts 1, 8, 9 and 10 are not, so no product is compliant with EN 1504-9. Part 9 sets the principles and methods that the product parts serve; the scope of EN 1504 parts 1 to 10 is summarized under EN 1504 parts 1 to 10.
Repair mortars under EN 1504-3:2005 reach CE marking through assessment and verification of constancy of performance (AVCP) system 2+ for buildings and civil engineering works and system 4 for low-performance uses. The standard is cited under Regulation (EU) No 305/2011 through Decision (EU) 2019/451 as amended by 2022/2357 and 2023/2461; the UK applies it as BS EN 1504-3:2005, and Germany's DIBt rule TR Instandhaltung uses EN 1504 terms.
Regulation (EU) 2024/3110 entered into force on 2025-01-07 and applies from 2026-01-08, yet CE marking to EN 1504 did not end then: standards cited under Regulation (EU) No 305/2011 stay valid until a product family moves under an implementing act.
Under the EU Construction Products Regulation, Delegated Regulation (EU) 2026/1310 (in force since 2026-09-17) assigns concrete protection and repair products AVS 2+ for structural and AVS 4 for non-structural uses. Declarations of performance and AVCP rules are explained under EU Construction Products Regulation.
ACI CODE-562-25 and US repair documents#
ACI CODE-562-25 is the US code for the assessment, repair and rehabilitation of existing concrete structures (2025, 134 pages), and ACI SPEC-563-25, ACI PRC-546-23 and ACI PRC-546.3-23 support it. The code works with the International Existing Building Code (IEBC) or stand-alone.
ACI SPEC-563-25 specifies repair of concrete in buildings, and ACI PRC-546.3-23 guides materials selection. The US has no R-class system for repair mortars, so a US specification names an ASTM document for the material (C928/C928M-25 for rapid repair materials, C881/C881M-20a for epoxy systems, C579-23 for resin mortars) and an ACI document for the design.
ICRI surface preparation and pull-off testing#
ICRI 310.1R-2008 sets the removal around corroded bars and ICRI 310.2R-2013 grades prepared surfaces from CSP 1 to CSP 10. A specification states a CSP range rather than a single profile, ICRI 310.3R-2014 covers preparation by hydrodemolition, and ICRI 320.2R-2018 guides the selection of repair materials.
Bond of the finished repair is checked in place by pull-off to ASTM C1583/C1583M-25 or EN 1542, read with ICRI 210.3R-2022. Neither test method sets a pass or fail value, so the acceptance value comes from the project specification. Preparation methods for each concrete surface profile are compared under concrete surface profile.
Condition survey tests before repair#
Four tests locate corrosion and contamination before a repair is designed, listed below.
- Half-cell potential mapping to ASTM C876-22b, which gives no current pass or fail value and does not apply to epoxy-coated reinforcement; the method is covered under half-cell potential testing.
- Chloride content by ASTM C1152/C1152M-20 (acid-soluble), ASTM C1218/C1218M-20 (water-soluble) or EN 14629:2007; sampling is covered under chloride testing of concrete.
- Carbonation depth by the phenolphthalein method of EN 14630:2006.
- Pull-off strength of the substrate and of trial patches by ASTM C1583/C1583M-25 or EN 1542; see pull-off adhesion testing.
VOC Limits and Safety Rules for Concrete Repair Products#
VOC limits for concrete repair products follow the category of each class, not the repair: crack fillers sold as sealants meet SCAQMD Rule 1168, inhibitor-silane sealers meet 100 g/L (0.83 lb/gal), and repair mortars have no confirmed category. At federal level, the EPA AIM rule (40 CFR 59 subpart D) sets no VOC content limit for adhesives or sealants.
VOC limits by category and jurisdiction#
SCAQMD Rule 1113 (amended 2016-02-05) has no repair-mortar or patching category, so a coating over a repair uses its own coating category. Proposed Amended Rule 1113 is in working-group stage with no public hearing date set. The table covers the VOC limits for repair classes only; every other category is listed under VOC limits for construction chemicals.
The table below compares the South Coast and federal VOC limits that apply to each repair class, in g/L (lb/gal).
| Repair class and category | SCAQMD (rule, amendment) | EPA AIM (made on or after 1999-09-13) |
|---|---|---|
| Crack fillers: Grout (cement-based sealant) | Rule 1168 (2022-11-04): 65 (0.54) | no federal adhesive or sealant limit |
| Crack fillers and premixed patching compounds sold as fillers: All Other Architectural Sealants | Rule 1168: 50 (0.42) | no federal adhesive or sealant limit |
| Crack fillers: Clear, Paintable, and Immediately Water-Resistant Sealant | Rule 1168: 250 (2.09) since 2026-01-01; 380 (3.17) before | no federal adhesive or sealant limit |
| Corrosion inhibitors with silane: Waterproofing Concrete/Masonry Sealers | Rule 1113 (2016-02-05): 100 (0.83) | not stated |
| Zinc-rich rebar coatings: Zinc-Rich IM Primers (at least 65 % zinc by weight of solids) | Rule 1113: 100 (0.83) | not stated |
| Repair and rapid-hardening mortars (dry mixes) | no Rule 1113 category; Rule 1168 (j)(7) labeling exemption only | not stated |
Rule 1168 paragraph (j)(7) exempts dry mixes with no polymer, mixed only with water, from the labeling requirements of subdivision (g) only; it is not an exemption from the VOC limits. No Rule 1168 category is confirmed for repair mortars, so no Rule 1168 limit is quoted here for them.
Cement, silica, epoxy and diisocyanate rules for applicators#
Cement-based repair products carry the portland cement line "No Annex VI entry; ECHA C&L notified classification: H315, H317, H318, H335"; see the product SDS. REACH Annex XVII entry 47 limits soluble Cr(VI) to 2 mg/kg (0.0002 %) of the total dry weight of the cement when hydrated.
Sand and fillers add quartz (crystalline silica): no Annex VI entry; no hazard statement in a majority of ECHA C&L notifications; classification is product-specific, see supplier SDS. Respirable crystalline silica in construction falls under OSHA 29 CFR 1926.1153 (PEL 50 µg/m³, action level 25 µg/m³, 8-h TWA), and the EU binding limit is 0.1 mg/m³ (Directive (EU) 2017/2398). Liquid epoxy resin carries Harmonised CLP Annex VI (index 603-074-00-8): H315, H317, H319, H411; the chemistry of epoxy resins and hardeners is set out under epoxy resins and hardeners.
Polyurethane crack fillers with 0.1 % by weight or more diisocyanates fall under REACH Annex XVII entry 74: a label statement since 2022-02-24 and training before industrial or professional use since 2023-08-24, renewed at least every 5 years. Polyurethane resins as a class have no Annex VI entry; see the product SDS.
Complete List of Concrete Repair Products: All 12 Classes#
The complete list below gives all 12 concrete repair product classes with their chemistry, European and US documents, main use, applicator need and a dated installed cost where one is published.
| # | Class | Chemistry | EU basis | US basis | Main use | Applicator | Installed cost (dated) |
|---|---|---|---|---|---|---|---|
| 1 | concrete repair mortars | CC, PCC | EN 1504-3:2005 R1 to R4 | ACI PRC-546.3-23 (selection guide) | spalls, reprofiling | yes (R3, R4) | spalling or scaling repair, residential flatwork, installed: USD 32 to 54 per m² (USD 3 to 5 per ft²), US, 2025-12, HomeGuide |
| 2 | rapid-hardening repair mortars | rapid cements, packaged dry | none stated | ASTM C928/C928M-25 | pavements, decks, ramps | depends | not published |
| 3 | epoxy mortars and polymer concrete | epoxy, amine hardener, aggregate | EN 1504-3:2005 R4 (PC) | ASTM C579-23; ACI 548.5R-16 | thin, chemical-resistant patches | yes (structural) | not published |
| 4 | concrete patching compounds | acrylic latex or cement-polymer | EN 1504-3:2005 R1 at most | none | cosmetic shallow patches | depends | driveway repairs and patching, installed: USD 32 to 86 per m² (USD 3 to 8 per ft²), US, 2025-12, HomeGuide |
| 5 | concrete resurfacers | cement, polymer powder, fine sand | none | none | worn flatwork | depends | concrete resurfacing, installed: USD 32 to 75 per m² (USD 3 to 7 per ft²), US, 2026-02, HomeGuide |
| 6 | concrete crack fillers | epoxy, HMWM, PU, latex | none stated | ASTM C881/C881M-20a Type I or II, Grade 1 | dormant cracks | depends | crack filling or sealing, flatwork, installed: USD 1.64 to 9.84 per m (USD 0.50 to 3 per linear ft), US, 2025-12, HomeGuide |
| 7 | hydraulic cement | cement, sand, accelerators | none | ASTM C1157/C1157M-25 (cement specification only) | active leaks | depends | not published |
| 8 | rebar corrosion protection coatings | cement slurry, epoxy-cement, zinc-rich epoxy | EN 1504-7:2006 | none stated | cleaned bars in patches | yes | not published |
| 9 | surface-applied corrosion inhibitors | amino alcohols, amine carboxylates | EN 1504-9:2008 method 11.3 (no product part) | none stated | corrosion without concrete removal | depends | not published |
| 10 | galvanic anodes and cathodic protection | zinc in activating mortar | EN ISO 12696:2022 | ISO 12696:2022 | chloride-contaminated members | yes | not published |
| 11 | FRP strengthening systems | carbon, glass or aramid fiber with epoxy | EN 1504-4:2004 (structural bonding) | ACI PRC-440.2-23, ACI CODE-440.13-24, ICC-ES AC125 | flexure, shear, confinement | yes | not published |
| 12 | shotcrete and sprayed repair mortars | cement concrete or mortar | EN 14487-1:2022 | ACI SPEC-506.2-13 (reapproved 2018) | large areas, overhead | yes | not published |
Four product classes used in concrete repair belong to other families and are named here, not counted: injection resins, concrete bonding agents, non-shrink grouts and EN 1504-2 protective coatings. Wider US installed figures exist for general concrete repair, USD 149 to 177 per m² (USD 13.82 to 16.43 per ft²) (Homewyse, 2026-01), and for spall repair with rebar treatment, USD 538 to 1,615 per m² (USD 50 to 150 per ft²) (blog cost guide, 2026-03).
Which Concrete Repair Product Is Best for a Project?#
No concrete repair product is best for every project: the right class matches the defect, the structural load and the return-to-service time, and a specification names it by EN 1504-3 class or ASTM document, not by brand. A structural spall over corroding bars needs R4 or R3, at least 45 MPa (6,527 psi) or 25 MPa (3,626 psi); a deck closed overnight needs an ASTM C928/C928M-25 class; a cosmetic chip needs a patching compound. An R4 claim is checked against the declaration of performance, a C928 claim against the test report.
What bonds new concrete to old concrete in a repair?#
A clean, sound, roughened and saturated surface bonds a cementitious repair, with a scrub coat of the same mortar worked into it, while epoxy bonding systems follow ASTM C881/C881M-20a. Epoxy concrete bonding agents are classed by hardened concrete surface temperature: Class A below 4 °C (40 °F), B from 4 to 15 °C (40 to 60 °F) and C above 15 °C (60 °F); latex and epoxy types are compared under concrete bonding agents.
Is a concrete patch the same as a repair mortar?#
No: a patching compound is a non-structural filler for shallow cosmetic defects, while a repair mortar carries an EN 1504-3 class up to structural R4. A patch tops out at R1, at least 10 MPa (1,450 psi), and carries no carbonation performance, while an R4 mortar reaches at least 45 MPa (6,527 psi) with a 2.0 MPa (290 psi) bond.
Does a concrete repair need a protective coating afterward?#
R1 and R2 mortars do where carbonation protection is needed: EN 1504-3:2005 footnote g calls for an EN 1504-2 surface protection with proven carbonation resistance. R3 and R4 mortars pass the carbonation-resistance test themselves, PC mortars are exempt from it, and protective coatings over a repair follow EN 1504-2:2004.
What is the best chemical for repairing concrete cracks?#
For dormant cracks, a low-viscosity epoxy to ASTM C881/C881M-20a Type I or II Grade 1 fills by gravity; for moving or leaking cracks, injection resins fit better. Epoxy, polyurethane and acrylic injection resins for concrete are compared under injection resins for concrete.
Is hydraulic cement a repair mortar?#
No: a hydraulic cement plug stops running water through a hole or crack, and it carries no EN 1504-3 class. Its cement may meet ASTM C1157/C1157M-25, a cement performance specification, but no standard tests the plug itself. After the leak stops, the wall or slab is repaired or waterproofed with a classed product.
Do concrete repairs need a trained applicator?#
Structural repairs do: 6 of the 12 classes need a trained applicator, namely repair mortars, epoxy mortars, rebar coatings, galvanic anodes, FRP and shotcrete. ACI offers a Repair Application Procedures certificate for applicators and ACI Shotcreter certification for shotcrete nozzle operators, while FRP takes manufacturer-trained applicators and ICC-ES AC178 special inspection. ICRI CSRT is a QC/QA and inspector credential, not an applicator requirement.
Can epoxy mortar be used outdoors?#
Yes, with limits: thermal mismatch with the concrete can crack or debond epoxy mortars where temperatures change sharply. Service near or above the resin's glass transition temperature softens the cured mortar.