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Materials & Specificationsaka: Portland cementaka: hydraulic cement

Cement

In Plain English

The powdery binding ingredient mixed with water and aggregate to make concrete.

Definition

Cement is a finely ground mineral powder that, when mixed with water, undergoes a chemical reaction (hydration) to form a hard binder. Portland cement is the most common type used in construction to make concrete, mortar, and grout. Cement is not the same as concrete; concrete is made by combining cement with aggregates and water.

Why It Matters in Bidding

Cement is the binder priced inside concrete and mortar, and its type and content drive both cost and performance, so estimators track the specified cement class even when buying ready-mix by the cubic yard. Specifying the wrong cement type or missing supplementary cementitious material requirements can fail durability specs and invite rejection, while cement price volatility affects how escalation is carried in a bid.

Example

An estimator pricing a foundation pour confirms the mix design calls for Type V sulfate-resistant cement for the site's soil conditions, then verifies the ready-mix quote reflects that mix rather than a standard Type I/II.

Related Terms

ConcreteMortarAggregateConcrete Masonry Unit

Frequently Asked Questions

No. Cement is only the binding ingredient; concrete is cement plus aggregates, water, and admixtures. Estimators almost always price concrete by the cubic yard through a ready-mix supplier whose quote already accounts for cement content. Confusing the two leads to misreading mix designs and mispricing durability or strength requirements in the spec.
Higher cement content and specialty cements such as sulfate-resistant or low-alkali types raise the mix price, as do supplementary cementitious materials required for durability or sustainability credits. Estimators must match the supplier quote to the project's specified mix design so the concrete line item reflects the actual performance requirements, not a generic rate.
On longer projects, yes. Cement and ready-mix prices can move between bid and pour, so estimators may include an escalation allowance or seek a price-hold from the supplier. Documenting any escalation assumption and the quote validity period protects margin and cash flow if material costs climb after award.

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