99 lines
3.9 KiB
Markdown
99 lines
3.9 KiB
Markdown
<!-- factbase:eb53be -->
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# Roman Concrete
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# Roman Concrete
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## Overview
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Roman concrete (*opus caementicium*) was a revolutionary building material that enabled the construction of domes, vaults, harbors, and aqueducts. Its durability surpasses modern Portland cement in some marine applications.
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## Key Facts
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- Period of use: ~3rd century BCE – 5th century CE
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- Composition: Volcanic ash (pozzolana), lime, seawater, and rock aggregate
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- Key innovation: Pozzolanic reaction with volcanic ash
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## Properties
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- Set underwater (hydraulic cement) — critical for harbor construction
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- Increased in strength over time through mineral crystallization [^1]
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- Could be molded into complex shapes (domes, vaults)
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- Less tensile strength than modern concrete but superior durability
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## Notable Structures
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- Pantheon dome (~125 CE): 43.3 m span, largest unreinforced concrete dome ever built
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- Colosseum (~80 CE): Concrete core with travertine facing
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- Harbors at Caesarea Maritima and Puteoli
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- Baths of Caracalla and Diocletian [^2]
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---
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[^1]: Jackson, M. et al. "Mechanical resilience and cementitious processes in Imperial Roman architectural morite" *PNAS* 111 (2014)
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[^2]: Lancaster, L. *Concrete Vaulted Construction in Imperial Rome* (Cambridge, 2005)
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---
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## Review Queue
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<!-- factbase:review -->
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- [ ] `@q[temporal]` Line 10: "Period of use: ~3rd century BCE – 5th century CE" - when was this true?
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- [ ] `@q[temporal]` Line 11: "Composition: Volcanic ash (pozzolana), lime, seawater, and rock aggregate" - when was this true?
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- [ ] `@q[temporal]` Line 12: "Key innovation: Pozzolanic reaction with volcanic ash" - when was this true?
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>
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- [ ] `@q[temporal]` Line 15: "Set underwater (hydraulic cement) — critical for harbor construction" - when was this true?
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>
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- [ ] `@q[temporal]` Line 16: "Increased in strength over time through mineral crystallization [^1]" - when was this true?
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>
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- [ ] `@q[temporal]` Line 17: "Could be molded into complex shapes (domes, vaults)" - when was this true?
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>
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- [ ] `@q[temporal]` Line 18: "Less tensile strength than modern concrete but superior durability" - when was this true?
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>
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- [ ] `@q[temporal]` Line 21: "Pantheon dome (~125 CE): 43.3 m span, largest unreinforced concrete dome ever..." - when was this true?
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>
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- [ ] `@q[temporal]` Line 22: "Colosseum (~80 CE): Concrete core with travertine facing" - when was this true?
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>
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- [ ] `@q[temporal]` Line 23: "Harbors at Caesarea Maritima and Puteoli" - when was this true?
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>
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- [ ] `@q[temporal]` Line 24: "Baths of Caracalla and Diocletian [^2]" - when was this true?
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- [ ] `@q[missing]` Line 10: "Period of use: ~3rd century BCE – 5th century CE" - what is the source?
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>
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- [ ] `@q[missing]` Line 11: "Composition: Volcanic ash (pozzolana), lime, seawater, and rock aggregate" - what is the source?
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>
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- [ ] `@q[missing]` Line 12: "Key innovation: Pozzolanic reaction with volcanic ash" - what is the source?
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>
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- [ ] `@q[missing]` Line 15: "Set underwater (hydraulic cement) — critical for harbor construction" - what is the source?
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>
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- [ ] `@q[missing]` Line 17: "Could be molded into complex shapes (domes, vaults)" - what is the source?
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>
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- [ ] `@q[missing]` Line 18: "Less tensile strength than modern concrete but superior durability" - what is the source?
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>
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- [ ] `@q[missing]` Line 21: "Pantheon dome (~125 CE): 43.3 m span, largest unreinforced concrete dome ever..." - what is the source?
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>
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- [ ] `@q[missing]` Line 22: "Colosseum (~80 CE): Concrete core with travertine facing" - what is the source?
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>
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- [ ] `@q[missing]` Line 23: "Harbors at Caesarea Maritima and Puteoli" - what is the source?
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>
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- [ ] `@q[stale]` Line 16: "Increased in strength over time through mineral crystallization [^1]" - Jackson source from 2014 may be outdated, is this still accurate?
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>
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- [ ] `@q[stale]` Line 24: "Baths of Caracalla and Diocletian [^2]" - Lancaster source from 2005 may be outdated, is this still accurate?
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>
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