Portland Cement
Hydraulic cement patented by Joseph Aspdin in 1824, made by burning and grinding limestone-and-clay mixtures into a binder for mortar and concrete.
Core metadata
- ID: portland_cement
- Era: Industrial
- First known date: 1824 (exact)
- Region: Leeds, England / Joseph Aspdin patent
- Review status: source_checked
- Maturity: established
Prerequisites
- Advanced Chemistry (advanced_chemistry)
- Clay Gathering and Preparation (clay_gathering_and_preparation)
- Fired Bricks & Early Kilns (fired_bricks_early_kilns)
- Lime Plaster (lime_plaster)
Dependents
- None.
Fields
Field lanes
- Civil Engineering & Built Environment: Construction Materials
Node sources
- Portland Cement (Encyclopaedia Britannica, 2026, textbook) • Supports: node, maturity
Prerequisite edge evidence
Edge/source evidence summary:
- Prerequisite edges: 4
- Average edge confidence: 75%
- Prerequisite sources: 4
- expert_inference: 1
- textbook: 3
| Prerequisite | Type | Confidence | Evidence level | Note | Sources |
|---|---|---|---|---|---|
| Lime Plaster (lime_plaster) | historical_predecessor | 72% | textbook | Portland cement belongs to the longer lime-based binder lineage; the source identifies limestone as a core raw material. |
|
| Clay Gathering and Preparation (clay_gathering_and_preparation) | required | 82% | textbook | The source describes Portland cement as made from limestone and clay or shale mixtures. |
|
| Fired Bricks & Early Kilns (fired_bricks_early_kilns) | required | 78% | textbook | Portland cement production requires burning the raw mixture, making kiln firing a direct process capability. |
|
| Advanced Chemistry (advanced_chemistry) | enabling | 66% | expert_inference | Industrial chemistry helped control calcination and binder composition, but Aspdin's patent was also a builder's process innovation. |
|
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