Concrete · TechGene

Definition

A composite material made by mixing and shaping a binder, fine and coarse aggregates, and water, then allowing it to harden for use in structures.

Binder and composite material

Cement is a binding material; concrete is a shaped composite material that contains aggregates. Ancient concrete could use lime–pozzolan systems, while modern engineering widely uses Portland or blended cements.

Reinforced forms

Reinforced concrete adds metal reinforcement to this foundation to improve tensile behavior. Durability depends on materials, design, construction, and the environment. A particular formulation alone cannot justify a claim of unlimited service life.

Principles and impact

Problems solved

Used a castable material to form required shapes and large engineering components.

Principles

Binder paste joins aggregates into a single mass.
Mix proportions, compaction during casting, and curing jointly affect performance.

Improvements

Not recorded

Significance

Turned cementitious materials into moldable systems for buildings and infrastructure.

History and applications

People

Not recorded

Organizations

Not recorded

Events

Not recorded

Applications

Building components、Roads、Hydraulic structures

Limitations

Tensile strength is relatively limited, requiring reinforcement as appropriate to loading conditions.
Excess water, inadequate curing, or aggressive environments can damage durability.

Upstream and downstream relations

Upstream

←CementusesIn 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 technologyusesAncient Roman concrete bound aggregates with a hydraulic binder system formed from lime and volcanic ash.

Sources: Preservation Brief 15: Preservation of Historic Concrete

←Portland cementusesPortland cement is a common binder for modern cement concrete; concrete also requires aggregates, forming, and curing.

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

←Limestone calcined clay cementusesLC3 with verified performance can be used as a binder in concrete; its performance in use must be assessed in relation to the mix design and environment.

Sources: The Material: Limestone Calcined Clay Cement History LC3-Project

Downstream

→Reinforced concretehas specialized formReinforced concrete is a form of concrete structural material strengthened by incorporating metal reinforcement.

Sources: The Invention of Reinforced Concrete (1848–1906)Preservation Brief 15: Preservation of Historic Concrete

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.

History LC3-Project

Source: LC3 project / EPFL

Link: https://lc3.ch/history-of-lc3-research/

Accessed: 2026-09-14

Evidence used

Research in 2005–2008 examined calcined-clay pozzolanic materials; in 2009–2012 it shifted to ternary binding systems combining clay and limestone. The international technology validation phase began in 2014, followed by work on market adoption and large-scale production in 2017–2020. The start of research and the industrialization stages are presented separately.

The Invention of Reinforced Concrete (1848–1906)

Source: Michel Moussard, Patricia Garibaldi, Manfred Curbach; research abstract provided by TU Dresden

Link: https://doi.org/10.1007/978-3-319-59471-2_316

Accessed on: 2026-09-14

Evidence used here

This review consulted TU Dresden's author and abstract records, not the paywalled full text. The abstract describes Lambot, Monier, and others using iron or steel mesh to reinforce cement products in the mid-19th century. Advances in modern cement and steel made this approach possible; systematic theory and standards developed gradually afterward.

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.

Definition

Binder and composite material

Reinforced forms

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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