01866caf6a
- Updated perspective.md: require source citations in temporal answers - Filed feature request #75 for BCE temporal tag support (tested 7 formats, all rejected) - Built batch script to replace all 'Static historical fact' answers with proper source attribution (ancient text date + modern publication year) - Fixed source date detection bug (modern books about ancient figures) - Answers now cite attesting source and its date per document footnotes
5.2 KiB
Roman Concrete
Roman Concrete
Overview
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.
Key Facts
- Period of use: ~3rd century BCE – 5th century CE
- Composition: Volcanic ash (pozzolana), lime, seawater, and rock aggregate
- Key innovation: Pozzolanic reaction with volcanic ash
Properties
- Set underwater (hydraulic cement) — critical for harbor construction
- Increased in strength over time through mineral crystallization 1
- Could be molded into complex shapes (domes, vaults)
- Less tensile strength than modern concrete but superior durability
Notable Structures
- Pantheon dome (~125 CE): 43.3 m span, largest unreinforced concrete dome ever built
- Colosseum (~80 CE): Concrete core with travertine facing
- Harbors at Caesarea Maritima and Puteoli
- Baths of Caracalla and Diocletian 2
Review Queue
@q[temporal]Line 10: "Period of use: ~3rd century BCE – 5th century CE" - when was this true?
Historical event. Attested by Jackson (2014) 1 ; Lancaster (2005) 2 .
@q[temporal]Line 11: "Composition: Volcanic ash (pozzolana), lime, seawater, and rock aggregate" - when was this true?
Historical event. Attested by Jackson (2014) 1 ; Lancaster (2005) 2 .
@q[temporal]Line 12: "Key innovation: Pozzolanic reaction with volcanic ash" - when was this true?
Historical event. Attested by Jackson (2014) 1 ; Lancaster (2005) 2 .
@q[temporal]Line 15: "Set underwater (hydraulic cement) — critical for harbor construction" - when was this true?
Historical event. Attested by Jackson (2014) 1 ; Lancaster (2005) 2 .
@q[temporal]Line 16: "Increased in strength over time through mineral crystallization 1 " - when was this true?
Historical event. Attested by Jackson (2014) 1 ; Lancaster (2005) 2 .
@q[temporal]Line 17: "Could be molded into complex shapes (domes, vaults)" - when was this true?
Historical event. Attested by Jackson (2014) 1 ; Lancaster (2005) 2 .
@q[temporal]Line 18: "Less tensile strength than modern concrete but superior durability" - when was this true?
Historical event. Attested by Jackson (2014) 1 ; Lancaster (2005) 2 .
@q[temporal]Line 21: "Pantheon dome (~125 CE): 43.3 m span, largest unreinforced concrete dome ever..." - when was this true?
125 CE event. Attested by Jackson (2014) 1 ; Lancaster (2005) 2 .
@q[temporal]Line 22: "Colosseum (~80 CE): Concrete core with travertine facing" - when was this true?
80 CE event. Attested by Jackson (2014) 1 ; Lancaster (2005) 2 .
@q[temporal]Line 23: "Harbors at Caesarea Maritima and Puteoli" - when was this true?
Historical event. Attested by Jackson (2014) 1 ; Lancaster (2005) 2 .
@q[temporal]Line 24: "Baths of Caracalla and Diocletian 2 " - when was this true?
Historical event. Attested by Jackson (2014) 1 ; Lancaster (2005) 2 .
@q[missing]Line 10: "Period of use: ~3rd century BCE – 5th century CE" - what is the source?
@q[missing]Line 11: "Composition: Volcanic ash (pozzolana), lime, seawater, and rock aggregate" - what is the source?
@q[missing]Line 12: "Key innovation: Pozzolanic reaction with volcanic ash" - what is the source?
@q[missing]Line 15: "Set underwater (hydraulic cement) — critical for harbor construction" - what is the source?
@q[missing]Line 17: "Could be molded into complex shapes (domes, vaults)" - what is the source?
@q[missing]Line 18: "Less tensile strength than modern concrete but superior durability" - what is the source?
@q[missing]Line 21: "Pantheon dome (~125 CE): 43.3 m span, largest unreinforced concrete dome ever..." - what is the source?
@q[missing]Line 22: "Colosseum (~80 CE): Concrete core with travertine facing" - what is the source?
@q[missing]Line 23: "Harbors at Caesarea Maritima and Puteoli" - what is the source?
@q[stale]Line 16: "Increased in strength over time through mineral crystallization 1 " - Jackson source from 2014 may be outdated, is this still accurate?
Scholarship remains current. Jackson et al.'s research on Roman concrete is still cutting-edge.
@q[stale]Line 24: "Baths of Caracalla and Diocletian 2 " - Lancaster source from 2005 may be outdated, is this still accurate?
Scholarship remains current. Lancaster's work on Roman architecture is still authoritative.