Cement · TechGene

Definition

A binder that reacts with water to form hardened products, joining particles or components into a whole; Portland cement is one type.

Scope of the technology

This cement entry covers hydraulic inorganic binders. Cement provides the binding action; concrete also contains aggregate and depends on forming and curing.

Timeline and branches

Ancient Roman lime–pozzolan systems were already capable of hardening underwater. The time field records evidence of known ancient applications rather than a precise invention year for cement. Modern Portland cement and low-clinker blended cements are different technological branches of this capability.

Principles and impact

Problems solved

Enabled construction binders to harden in damp environments and supported engineering materials that can be formed into shape.

Principles

Hydraulic systems react with water to form solid hydration products.
Different cements have different compositions; cement, cement clinker and concrete should not be treated as the same thing.

Improvements

Not recorded

Significance

Provides a shared binder foundation for mortar, concrete and grout.

History and applications

People

Not recorded

Organizations

Not recorded

Events

Not recorded

Applications

Mortar、Concrete、Grout

Limitations

Material performance depends on composition, water proportions and curing.
Being hydraulic does not imply durability in every environment.

Upstream and downstream relations

Upstream

No direct upstream relations recorded

Downstream

→Limestone calcined clay cementhas specialized formLC3 is a blended cement approach that uses clinker, limestone, calcined clay, and gypsum.

Sources: The Material: Limestone Calcined Clay Cement

→Concreteapplied inIn concrete, cement combines with water to form a binding paste that holds fine and coarse aggregates together.

Sources: How Cement Is Made Preservation Brief 15: Preservation of Historic Concrete

→Pozzolanic binder technologyimplemented byCombining lime with reactive volcanic ash is one specific material approach to achieving hydraulic binding properties.

Sources: Preservation Brief 15: Preservation of Historic Concrete Types of Cement

→Portland cementhas specialized formPortland cement is a type of hydraulic cement; this specific type should not be treated as equivalent to the entire category of cement.

Sources: Types of Cement

Sources for this entry and its relations

Preservation Brief 15: Preservation of Historic Concrete

Source: Paul Gaudette and Deborah Slaton; U.S. National Park Service, 2007

Link: https://www.nps.gov/orgs/1739/upload/preservation-brief-15-concrete.pdf

Accessed: 2026-09-14

Evidence used

Pages 1–4 cover the hydraulic binding system of lime and volcanic ash in ancient Rome, the distinction between aggregate and binder, the development of reinforced concrete and rotary-kiln manufacturing in the 19th century, and the effects of water proportioning and curing on concrete performance. Page 4 onward discusses reinforcement corrosion and concrete deterioration. Only the relevant history and material mechanisms are used; this preservation guide is not treated as a structural design code.

The Material: Limestone Calcined Clay Cement

Source: LC3 project / EPFL

Link: https://lc3.ch/the-material/

Accessed on: 2026-09-14

Evidence used here

LC3 consists of clinker, calcined clay, limestone, and gypsum. The alumina component in metakaolin works with limestone to form hydration products, allowing a higher degree of clinker substitution. Suitability depends on the clay's mineral composition and the actual properties of the materials.

Types of Cement

Source: American Cement Association

Link: https://www.cement.org/cement-concrete/types-of-cement/

Accessed: 2026-09-14

Evidence used

Hydraulic cement reacts with water to form solid hydration products and can harden underwater. Portland cement and various blended cements fall into this category. Only the material classification is cited here; it is not used to establish equivalence with Chinese product standards.

How Cement Is Made

Source: American Cement Association

Link: https://www.cement.org/cement-concrete/how-cement-is-made/

Accessed: 2026-09-14

Evidence used

Cement manufacturing includes preparing raw materials, forming clinker in a kiln, cooling the clinker, and grinding it with gypsum and other materials. Rotary kilns and waste-heat recovery support continuous industrial production. Cement and water form a binding paste that holds the sand and stone in concrete together.

Mortar, Unsung Hero of History

Source: U.S. National Park Service, NPS / NCPTT, 2024

Link: https://home.nps.gov/articles/000/mortar-unsung-hero-of-history.htm

Accessed on: 2026-09-14

Evidence used here

Traditional lime mortar consists of lime, sand, and water; lime-based systems harden through carbonation. The article cites the Romans adding volcanic ash to lime around 30 BCE to suit damp conditions. This date is used as a lead on a known application, not as the world's first invention. Modern, hard cement mortars are not necessarily suitable for softer historic masonry.

Definition

Scope of the technology

Timeline and branches

Principles and impact

Problems solved

Principles

Improvements

Significance

History and applications

People

Organizations

Events

Applications

Limitations

Upstream and downstream relations

Upstream

Downstream

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