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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsChoose the material for the work, not simply a bag labeled “cement.” For ordinary concrete, start with a general-purpose Portland or blended hydraulic cement that matches the project specification—often ASTM C150 Type I or Type I/II, ASTM C595 blended cement such as Type IL, or ASTM C1157 GU. For brick or block, buy the specified masonry mortar, not straight Portland cement. For a small concrete patch, use a packaged repair mortar compatible with the substrate and exposure. Historic repointing, structural cracks, and code-regulated work require a project-specific assessment.
The terms are easy to mix up: cement is the water-reactive binder; concrete is cement paste plus fine and coarse aggregate; mortar is the joint-bonding material used with masonry units. Identifying which of these you actually need prevents the most expensive selection mistake.
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Start by identifying what you are buying
Cement is the binder
Hydraulic cement reacts with water and hardens. It is an ingredient, not usually the finished material placed in a footing, slab, wall joint, or patch. A bag marked Portland cement or blended hydraulic cement supplies the binder that must be combined with water and aggregate according to a mix design or product directions.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchConcrete includes aggregate
Concrete is cement paste binding fine aggregate (such as sand) and coarse aggregate (such as gravel or crushed stone). The American Cement Association says cement typically represents about 10% to 15% of concrete mix volume. That is a broad explanatory estimate, not a recipe for batching your project. Concrete develops strength over time, with most strength developing in the first few weeks after placement; the required mixture, curing, placement, and exposure determine whether it performs as intended.
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Mortar bonds masonry units
Masonry mortar fills joints and bonds brick, concrete masonry units, and other masonry units. It can contain Portland cement, hydrated lime, masonry cement, aggregate, and air. A mortar type is selected for the masonry assembly and design requirements, not by treating Portland cement as a ready-to-use substitute. ASTM C270-26 covers mortars for non-reinforced and reinforced unit masonry and permits either proportion or property specifications.
A quick decision path
- Name the application. Decide whether you need concrete, masonry mortar, grout, or a concrete-repair material. A slab and a brick joint do not use the same finished product.
- Read the project specification. Plans, a building code, an engineer, a preservation brief, or the manufacturer may require a particular ASTM designation, performance class, or mortar type.
- Check exposure. Sulfate-bearing soil or groundwater, freeze-thaw cycling, heat from a large placement, and the need for early strength can change the cement choice.
- Match the substrate and repair size. A patch must bond to the existing concrete and accommodate the depth, movement, moisture, and exposure of the repair.
- Confirm local availability and directions. Cement labels and blended products vary by jurisdiction and supplier. Use the complete designation on the current bag or technical data sheet, and follow its handling and mixing instructions.
Choosing cement for ordinary concrete
For routine, non-specialty concrete, use a general-purpose hydraulic cement that satisfies the specification. In the United States, common paths are ASTM C150 Type I or Type I/II Portland cement, ASTM C595 blended hydraulic cement, and ASTM C1157 performance cement designated GU (general use). Type I/II means one cement meets both listed designations; it is not a promise that every Type I/II product suits every exposure.
| Project requirement | ASTM C150 Portland cement | ASTM C595 blended hydraulic cement | ASTM C1157 performance designation |
|---|---|---|---|
| General use | Type I or Type I/II | IL, IP, IS, or IT families when specified | GU |
| High early strength | Type III | Use the designation specified for the product | HE |
| Moderate sulfate resistance | Type II | Use the specified blended product | MS |
| High sulfate resistance | Type V | Use the specified blended product | HS |
| Moderate or low heat | Use the type required by the mixture design | Use the specified blended product | MH or LH |
The table shows designation families, not interchangeable shopping shorthand. ASTM C150 classifies Portland cement by type; ASTM C595 covers blended hydraulic cements; ASTM C1157 is a performance specification. Verify the exact product designation and the concrete specification before substituting one family for another.
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Type I and Type I/II for general work
Type I is the American Cement Association’s general-use category. Type I/II has been widely available in the United States and combines the two designations on one cement. Availability changes by region and supplier, so inspect the current label rather than assuming a local store carries the same type year-round.
Type II or MS for moderate sulfate exposure
Use Type II under ASTM C150, or an MS-designated cement under ASTM C1157, when the project calls for moderate sulfate resistance. Sulfates can occur in soil or groundwater. The cement designation is only one part of durability: aggregate, water-cement ratio, mixture proportions, curing, drainage, and the exposure classification also matter. Have the project designer establish the required class where sulfate exposure is uncertain.
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Type V or HS for high sulfate exposure
Type V Portland cement and HS performance cement address high sulfate resistance when the specification requires them. Do not choose Type V solely because a site is damp; moisture alone does not establish a high-sulfate exposure. A geotechnical report, testing, or the engineer’s specification may be needed.
Type III or HE for high early strength
Type III cement and HE-designated performance cement are intended where high early strength is required. “Early” does not mean the concrete can be loaded immediately. Placement, temperature, curing, mixture design, and the actual strength acceptance criteria still control when work can proceed.
Blended hydraulic cements and Type IL
ASTM C595 includes IL (Portland-limestone), IP (Portland-pozzolan), IS (Portland-blast-furnace-slag), and IT (ternary blended) families. Portland-limestone cement, designated Type IL, is a mainstream general-concrete option in the cited U.S. context. The American Cement Association reports that Type IL contains 5% to 15% limestone. It also reported that U.S. total shipments of Portland-limestone cement exceeded shipments of Portland cement in mid-2023; that dated comparison should not be read as a 2026 market statistic.
A blended designation tells you how the cement is classified, not that it is automatically suitable for every slab, foundation, repair, or exposure. Follow the project specification and the producer’s current data.
Air entrainment and freeze-thaw exposure
Air entrainment helps concrete resist freeze-thaw cycling by creating a controlled air-void system. The American Cement Association notes that air entrainment is commonly achieved with an air-entraining admixture added during batching rather than by simply buying an air-entraining cement. Durable freeze-thaw concrete depends on the required air system, mixing, placement, curing, and the complete specification. Buying a cement bag with an air-related label does not by itself guarantee a durable mixture.
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What to use for brick, block, and stone mortar
For masonry, select a finished mortar specified for the units and the wall—not straight Portland cement. A preblended mortar can be appropriate when its type and performance match the plans. On a site-mixed project, the specification may call for Portland cement, lime, masonry cement, and aggregate in controlled proportions.
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ASTM C270-26 covers mortar for reinforced and non-reinforced unit masonry and provides both proportion and property specification methods. The standard includes four mortar types. A letter type is not universally “best”: the appropriate choice depends on the masonry unit, structural role, weather exposure, joint design, and the specifier’s direction. Use the type named in the plans or have a qualified masonry professional select it.
Do not infer mortar from appearance alone
Old joints can contain Portland cement, hydrated lime, masonry cement, aggregates, and air in combinations that are not visible from the surface. ASTM’s hardened-mortar analysis work explains that composition analysis can identify components, but composition alone does not establish compliance with a standard. A hard-looking joint is not proof that a harder replacement mortar is compatible. Excessively rigid or strong repointing can damage softer historic units by shifting moisture and stress into the masonry.
Historic masonry repointing requires an assembly-based choice
Repointing replaces deteriorated joint mortar; it is not the same as filling a crack in a concrete step. Before selecting mortar, determine how the historic wall was built, what the joints do, how water moves through the assembly, what repairs are required, and how the replacement will perform over the long term.
ASTM C1713-24a covers mortar used to repair masonry built with methods and materials that predate current standards. Its scope includes repointing and potentially structural joint repair. The standard states: “Use of this specification should be based on a thorough understanding of the function, maintenance, and repair requirements for the preservation and continued performance of the masonry in the context of the building structure and long-term performance.” ASTM lists the edition as last updated July 17, 2026. Laboratory-prepared mortar samples do not represent in-place site mortar, so a laboratory match is not, by itself, a universal field recipe.
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Government specifications illustrate how demanding this work can be. The U.S. General Services Administration’s repointing procedure includes material requirements, agency approval, and demonstrated proficiency for its own historic-preservation work. Treat that procedure as an example of an agency project specification, not as a one-size-fits-all homeowner instruction.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choosing material for a concrete home repair
A small, nonstructural concrete repair may use a packaged cementitious repair mortar, but the product must suit the substrate, repair dimensions, exposure, and movement. The available evidence does not support one brand or formula for every home repair.
Classify the defect before buying
- Surface scaling, spalling, or a shallow chip: determine whether the surrounding concrete is sound and whether corrosion, deicing salts, drainage, or freeze-thaw caused the loss.
- A narrow, stable cosmetic crack: choose a repair product whose instructions cover the crack width and substrate. Cleaning and preparation may matter as much as the cementitious material.
- A widening, offset, leaking, or load-related crack: stop treating it as a cosmetic patch. Movement, settlement, water pressure, reinforcement corrosion, or structural distress may be involved.
- A failed brick or block joint: use a masonry-repointing approach and mortar compatible with the existing assembly, not a concrete patch.
Follow the repair product’s limits
Read the technical data and label for allowable thickness, substrate preparation, moisture condition, mixing, placement, finishing, and curing. Do not add extra water to make a stiff repair flow, combine products from different systems without approval, or cover a moving joint with a rigid patch. If the repair supports a beam, retaining wall, foundation, balcony, stair, or other safety-critical element, obtain a qualified assessment before choosing material.
Concrete, mortar, grout, and patch: a practical comparison
| Material | Primary job | What determines selection |
|---|---|---|
| Concrete | Mass or structural element made with cement paste and fine and coarse aggregate | Specified cement designation, mixture design, loads, exposure, placement, and curing |
| Masonry mortar | Beds and bonds brick, block, and other masonry units and fills joints | ASTM C270 type or project specification, unit properties, wall function, exposure, and compatibility |
| Grout | Fills designed cavities or spaces in masonry or construction assemblies | Specified grout system, space geometry, reinforcement, flow, and structural requirements |
| Repair mortar | Rebuilds a defined area of damaged concrete or masonry | Substrate, repair depth, movement, moisture, exposure, and the product’s limits |
Common selection mistakes and how to avoid them
Buying “cement” for a concrete project without aggregate
Portland cement is not a bag of ready-to-place concrete. Confirm whether the product is cement, concrete mix, mortar mix, grout, or repair mortar. If a project calls for concrete, the aggregate and mixture proportions are part of the performance—not optional additions.
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Using concrete mix as brick mortar
Concrete aggregate is too coarse and the material is not proportioned or designed to form proper masonry joints. Use the specified masonry mortar.
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Choosing by strength alone
Higher compressive strength is not automatically better. Compatibility, permeability, movement, bond, sulfate exposure, freeze-thaw durability, and the function of the assembly can matter more—especially in historic masonry.
Assuming a type label answers every exposure question
Type I, II, III, V, IL, GU, HE, MS, and HS describe classification systems. They do not replace the complete concrete or masonry specification. Confirm the edition, exact product designation, exposure assumptions, and local code requirements.
Assuming a historical recipe can be copied from a modern bag
Historic mortar selection requires investigation of the existing assembly and repair goals. A visual match or a laboratory-prepared sample cannot, alone, establish long-term compatibility in the wall.
Questions to settle before purchase
- Is the job concrete, masonry mortar, grout, or a repair patch?
- What standard, type, or performance designation appears in the plans or product data?
- Will the material face sulfate-bearing soil or groundwater?
- Will it experience repeated freezing and thawing?
- Is early strength or low heat specifically required?
- What are the existing substrate and masonry materials?
- Is the defect cosmetic, water-related, moving, or potentially structural?
- Is the product available locally in the required designation and package size?
- What preparation, water limits, placement, and curing steps does the manufacturer require?
U.S. standards and regional limits
The designations discussed here are predominantly U.S.-oriented ASTM terminology. Other countries use different standards, labels, and conformity marks, and local building regulations can control the permissible cement or mortar. Check the current edition of the named standard and local availability at the time of purchase. For engineered, structural, code-regulated, or historic-preservation work, the project specification and a qualified local professional should govern the final choice.
A useful technical reference
The American Cement Association’s Design and Control of Concrete Mixtures, 17th edition, is described by the association as reflecting current guidance on cement and concrete technology and standards. It can help readers understand terminology and mixture principles, but it does not replace the project documents, testing, or professional design required for a particular structure.
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