Short answer
Cement names the binder, concrete names the aggregate-containing bulk material, and masonry mortar names the fine-aggregate mixture used in joints. Cement becomes paste when mixed with water; that paste binds the aggregate in ordinary concrete and mortar. Mortar can also mean the fine-aggregate portion inside concrete, rather than a separate masonry product. 1 2
On this page
At a glance
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| Attribute | Cement | Concrete | Mortar |
|---|---|---|---|
| Basic identity | Binder ingredient | Combined construction material | Fine-aggregate mixture |
| Composition in ordinary cement-based use | Cement before paste formation | Cement, water, and aggregates | Cement paste and fine aggregate |
| Role in the distinction | Binds aggregate | Names the whole mixture | Names masonry joint material or concrete’s fine-aggregate portion |
These are composition-and-role distinctions, not interchangeable labels. 1 2
What each thing is
Think in layers: cement plus water makes paste; paste plus fine aggregate makes mortar; in ACI’s matrix description, mortar surrounds the coarse aggregate in concrete. This explains why cement is an ingredient while the other two names describe mixtures. It is a conceptual breakdown, not a prescribed mixing procedure. 1 2
Key differences
Aggregate is the central compositional divider. Mortar contains fine aggregate, while ordinary concrete includes aggregates such as sand, gravel, or crushed stone. Masonry joint mortar may also contain lime or other admixtures for greater plasticity and workability than standard portland cement mortar offers; it is not simply concrete assigned a different job. 1 2
How to tell them apart
Check both ingredients and the material’s stated role. A binder alone points to cement; a paste-and-aggregate bulk mixture points to concrete; a fine-aggregate masonry joint mixture points to mortar. Do not classify by appearance alone: the supplied definitions concern composition, and specialized binders complicate a simple cement-based checklist. 1 2
Where they overlap
Mortar is not always separate from concrete. ACI uses the word for the material occupying spaces between coarse-aggregate particles in fresh concrete. Thus, a concrete mixture can contain a mortar portion, and both can contain cement paste. The labels describe different levels of the same material system. 1
Edge cases
Epoxy mortar is an important exception to the ordinary cement-paste definition: ACI describes it as epoxy resin, hardener, and fine aggregate. The modifier matters. Calling every mortar a hydraulic-cement mixture would erase this recognized subtype, even though cement-based masonry mortar remains the focus here. 1
Why the distinction exists
The vocabulary separates an ingredient from the mixtures made with it and distinguishes the whole concrete mixture from its matrix. That separation keeps a statement about cement from being mistaken for a statement about every component of concrete. ACI’s matrix terminology makes this nested relationship explicit. 1 2
Common misconceptions
Cement and concrete are not synonyms: cement is one ingredient of concrete. Nor does “mortar” exclusively mean material in masonry joints. Finally, “portland” identifies a cement type, not all cement; the FAQ also identifies portland-limestone cement among common types used in concrete. 1 2
Examples
Two hypothetical cases apply the distinction: