Roman concrete - wikipedia Roman concrete The Pantheon in Rome is an example of Roman concrete construction. Roman concrete, also called opus caementicium, was a material used in construction during the late Roman Republic until the fading of the Roman Empire. Roman concrete was based on a hydraulic - setting cement. Recently, it has been found that it materially differs in several ways from modern concrete which is based on Portland cement. Roman concrete is durable due to its incorporation of volcanic ash, which prevents cracks from spreading. By the middle of the 1st century, the material was used frequently, often brick - faced, although variations in aggregate allowed different arrangements of materials. Further innovative developments in the material, called the Concrete Revolution, contributed to structurally complicated forms, such as the Pantheon dome, the world 's largest and oldest unreinforced concrete dome. Roman concrete was normally faced with stone or brick, and interiors might be further decorated by stucco, fresco paintings, or thin slabs of fancy colored marbles. Made up of aggregate and cement, like modern concrete, it differed in that the aggregate pieces were typically far larger than in modern concrete, often amounting to rubble, and as a result it was laid rather than poured. Some Roman concretes were able to be set underwater, which was useful for bridges and other waterside construction. It is uncertain when Roman concrete was developed, but it was clearly in widespread and customary use from about 150 BC ; some scholars believe it was developed a century before that. Contents 1 Historic references 2 Material properties 3 Seismic technology 4 Modern use 5 See also 6 Literature 7 References 8 External links Historic references Caesarea is the earliest known example to have used underwater Roman concrete technology on such a large scale. Vitruvius, writing around 25 BC in his Ten Books on Architecture, distinguished types of aggregate appropriate for the preparation of lime mortars. For structural mortars, he recommended pozzolana, which are volcanic sands from the sandlike beds of Pozzuoli brownish - yellow - gray in color near Naples and reddish - brown at Rome. Vitruvius specifies a ratio of 1 part lime to 3 parts pozzolana for cements used in buildings and a 1 : 2 ratio of lime to pulvis Puteolanus for underwater work, essentially the same ratio mixed today for concrete used at sea. By the middle of the 1st century, the principles of underwater construction in concrete were well known to Roman builders. The city of Caesarea was the earliest known example to have made use of underwater Roman concrete technology on such a large scale. Rebuilding Rome after the fire in 64 AD, which destroyed large portions of the city, the new building code by Nero consisted of largely brick - faced concrete. This appears to have encouraged the development of the brick and concrete industries. Example of opus caementicium on a tomb on the ancient Appian Way in Rome. The original covering has been removed. Material properties Roman concrete, like any concrete, consists of an aggregate and hydraulic mortar -- a binder mixed with water that hardens over time. The aggregate varied, and included pieces of rock, ceramic tile, and brick rubble from the remains of previously demolished buildings. Gypsum and quicklime were used as binders. Volcanic dusts, called pozzolana or `` pit sand '', were favored where they could be obtained. Pozzolana makes the concrete more resistant to salt water than modern - day concrete. The pozzolanic mortar used had a high content of alumina and silica. Tuff was often used as an aggregate. Concrete, and in particular, the hydraulic mortar responsible for its cohesion, was a type of structural ceramic whose utility derived largely from its rheological plasticity in the paste state. The setting and hardening of hydraulic cements derived from hydration of materials and the subsequent chemical and physical interaction of these hydration products. This differed from the setting of slaked lime mortars, the most common cements of the pre-Roman world. Once set, Roman concrete exhibited little plasticity, although it retained some resistance to tensile stresses. The setting of pozzolanic cements has much in common with setting of their modern counterpart, Portland cement. The high silica composition of Roman pozzolana cements is very close to that of modern cement to which blast furnace slag, fly ash, or silica fume have been added. The strength and longevity of Roman marine concrete is understood to benefit from a reaction of seawater with a mixture of volcanic ash and quicklime to create a rare crystal called tobermorite, which may resist fracturing. As seawater percolated within the tiny cracks in the Roman concrete, it reacted with phillipsite naturally found in the volcanic rock and created aluminous tobermorite crystals. The result is a candidate for `` the most durable building material in human history. '' In contrast, modern concrete exposed to saltwater deteriorates within decades. Crystal structure of tobermorite : elementary unit cell Compressive strengths for modern Portland cements are typically at the 50 MPa level and have improved almost ten-fold since 1860. There are no comparable mechanical data for ancient mortars, although some information about tensile strength may be inferred from the cracking of Roman concrete domes. These tensile strengths vary substantially from the water / cement ratio used in the initial mix. At present, there is no way of ascertaining what water / cement ratios the Romans used, nor are there extensive data for the effects of this ratio on the strengths of pozzolanic cements. Seismic technology For an environment as prone to earthquakes as the Italian peninsula, interruptions and internal constructions within walls and domes created discontinuities in the concrete mass. Portions of the building could then shift slightly when there was movement of the earth to accommodate such stresses, enhancing the overall strength of the structure. It was in this sense that bricks and concrete were flexible. It may have been precisely for this reason that, although many buildings sustained serious cracking from a variety of causes, they continue to stand to this day. Another technology used to improve the strength and stability of concrete was its gradation in domes. One example is the Pantheon, where the aggregate of the upper dome region consists of alternating layers of light tuff and pumice, giving the concrete a density of 1,350 kg / m. The foundation of the structure used travertine as an aggregate, having a much higher density of 2,200 kg / m. Modern use Recent scientific breakthroughs examining Roman concrete have been gathering media and industry attention. Because of its unusual durability, longevity and lessened environmental footprint, corporations and municipalities are starting to explore the use of Roman - style concrete in North America, substituting the coal fly ash with volcanic ash that has similar properties. Proponents claim that concrete made with volcanic ash can cost up to 60 % less because it requires less cement, and that it has a smaller environmental footprint due to its lower cooking temperature and much longer lifespan. Usable examples of Roman concrete exposed to harsh marine environments have been found to be 2000 years old with little or no wear. See also Energetically modified cement ( EMC ) Geopolymer Roman brick Pozzolanic reaction Tobermorite Literature Jean - Pierre Adam, Anthony Mathews, Roman Building, 1994 Lynne C. Lancaster, Concrete Vaulted Construction in Imperial Rome, Cambridge University Press, 2005 Heather N. Lechtman & Linn W. Hobbs, `` Roman Concrete and the Roman Architectural Revolution, '' Ceramics and Civilization Volume 3 : High Technology Ceramics : Past, Present, Future, edited by W.D. Kingery and published by the American Ceramics Society, 1986 W.L. MacDonald, The Architecture of the Roman Empire, rev. ed. Yale University Press, New Haven, 1982 References Jump up ^ Moore, David ( February 1993 ). `` The Riddle of Ancient Roman Concrete ''. S Dept. of the Interior, Bureau of Reclamation, Upper Colorado Region. www.romanconcrete.com. Retrieved 20 May 2013. Jump up ^ Henig, Martin ( ed ), A Handbook of Roman Art, p. 30, Phaidon, 1983, ISBN 0714822140 Jump up ^ Boëthius, Axel, Ling, Roger, Rasmussen, Tom, Etruscan and Early Roman Architecture, pp. 128 - 129, Yale / Pelican history of art, 1978, Yale University Press, ISBN 0300052901, 9780300052909, Google Books Jump up ^ Heather Lechtman and Linn Hobbs `` Roman Concrete and the Roman Architectural Revolution '', Ceramics and Civilization Volume 3 : High Technology Ceramics : Past, Present, Future, edited by W.D. Kingery and published by the American Ceramics Society, 1986 ; and Vitruvius, Book II : v, 1 ; Book V : xii2 ^ Jump up to : Lechtman and Hobbs `` Roman Concrete and the Roman Architectural Revolution '' Jump up ^ Wayman, Erin. `` The Secrets of Ancient Rome 's Buildings. '' Smithsonian.com. 16 November 2011. Retrieved 24 April 2012. Jump up ^ `` Rome 's Invisible City - BBC One ''. BBC. Retrieved 6 July 2017. Jump up ^ Guarino, Ben ( 4 July 2017 ). `` Ancient Romans made world 's ' most durable ' concrete. We might use it to stop rising seas ''. Washington Post. access - date = requires url = ( help ) Jump up ^ Jackson, Marie D. ; Mulcahy, Sean R. ; Chen, Heng ; Li, Yao ; Li, Qinfei ; Cappelletti, Piergiulio ; Wenk, Hans - Rudolf ( 2017 ). `` Phillipsite and Al - tobermorite mineral cements produced through low - temperature water - rock reactions in Roman marine concrete ''. American Mineralogist. 102 ( 7 ) : 1435 -- 1450. doi : 10.2138 / am - 2017 - 5993CCBY. ISSN 0003 - 004X. Jump up ^ McGrath, Matt ( 4 July 2017 ). `` Scientists explain ancient Rome 's long - lasting concrete ''. Retrieved 6 July 2017 -- via www.bbc.co.uk. Jump up ^ N.B. Eden and J.E. Bailey, `` Mechanical Properties and Tensile Failure Mechanism of a High Strength Polymer Modified Portland Cement, '' J. Mater. Sci., 19, 2677 -- 85 ( 1984 ) ; and Lechtman and Hobbs `` Roman Concrete and the Roman Architectural Revolution '' Jump up ^ Lechtman and Hobbs `` Roman Concrete and the Roman Architectural Revolution '' ; see also : C.A. Langton and D.M. Roy, `` Longevity of Borehole and Shaft Sealing Materials : Characterization of Ancient Cement Based Building Materials, '' Mat. Res. Soc. SYmp. Proc. 26, 543 -- 49 ( 1984 ) ; and Topical Report ONWI - 202, Battelle Memorial Institute, Office of Nuclear Waste Isolation, Distribution Category UC - 70, National Technical Information Service, U.S. Department of Commerce, 1982. ) Jump up ^ W.L. MacDonald, The Architecture of the Roman Empire, rev. ed. Yale University Press, New Haven, 1982, fig. 131B ; Lechtman and Hobbs `` Roman Concrete and the Roman Architectural Revolution '' Jump up ^ K. de Fine Licht, The Rotunda in Rome : A Study of Hadrian 's Pantheon. Jutland Archaeological Society, Copenhagen, 1968, pp. 89 -- 94, 134 -- 35 ; and Lechtman and Hobbs `` Roman Concrete and the Roman Architectural Revolution '' Jump up ^ Sezen Soyer - Uzun, Sejung Rosie Chae, Chris J. Benmore, Hans - Rudolf Wenk, Paulo J.M. Monteiro, `` Compositional Evolution of Calcium Silicate Hydrate ( C-S-H ) Structures by Total X-Ray Scattering '', Journal of the American Ceramic Society, Volume : 95 Issue : 2 Pages : 793 - 798, February 2012 Jump up ^ `` Fixing Canada 's Infrastructure with Volcanoes ''. Trebuchet Capital Partners Research. Retrieved 19 August 2016. Jump up ^ Compositional Evolution of Calcium Silicate Hydrate ( C-S-H ) Structures by Total X-Ray Scattering Jump up ^ M.D. Jackson, S.R. Chae, R. Taylor, C. Meral, J. Moon, S. Yoon, P. Li, A.M. Emwas, G. Vola, H. - R. Wenk, and P.J.M. Monteiro, Unlocking the secrets of Al - tobermorite in Roman seawater concrete, American Mineralogist, Volume 98, pages 1669 -- 1687, 2013. External links The Secrets of Ancient Rome 's Buildings -- article on Smithsonian.com Roman Seawater Concrete Holds the Secret to Cutting Carbon Emissions -- article on Berkeley Lab website Ancient Rome topics Outline Timeline Epochs Foundation Kingdom overthrow Republic Empire Pax Romana Principate Dominate Western Empire fall historiography of the fall Byzantine Empire decline fall Constitution History Kingdom Republic Empire Late Empire Senate Legislative assemblies Curiate Centuriate Tribal Plebeian Executive magistrates SPQR Government Curia Forum Cursus honorum Collegiality Emperor Legatus Dux Officium Prefect Vicarius Vigintisexviri Lictor Magister militum Imperator Princeps senatus Pontifex Maximus Augustus Caesar Tetrarch Optimates Populares Province Magistrates Ordinary Consul Censor Praetor Tribune Tribune of the Plebs Military tribune Quaestor Aedile Promagistrate Governor Extraordinary Rex Interrex Dictator Magister Equitum Decemviri Consular Tribune Triumvir Law Twelve Tables Mos maiorum Citizenship Auctoritas Imperium Status Litigation Military Borders Establishment Structure Campaigns Political control Strategy Engineering Frontiers and fortifications castra Technology Army Legion Infantry tactics Personal equipment Siege engines Navy Auxiliaries Decorations and punishments Hippika gymnasia Economy Agriculture Deforestation Commerce Finance Currency Republican currency Imperial currency Technology Abacus Numerals Civil engineering Military engineering Military technology Aqueducts Bridges Circus Concrete Domes Forum Metallurgy Roads Sanitation Thermae Culture Architecture Art Bathing Calendar Clothing Cosmetics Cuisine Hairstyles Education Literature Music Mythology Religion Romanization Sexuality Theatre Wine Society Patricians Plebs Conflict of the Orders Secessio plebis Equites Gens Tribes Naming conventions Demography Women Marriage Adoption Slavery Bagaudae Latin History Alphabet Versions Old Classical Vulgar Late Medieval Renaissance New Contemporary Ecclesiastical Romance languages Writers Latin Ammianus Marcellinus Appian Appuleius Asconius Pedianus Augustine Aurelius Victor Ausonius Boëthius Caesar Catullus Cassiodorus Censorinus Cicero Claudian Columella Ennius Eutropius Fabius Pictor Festus Florus Frontinus Fulgentius Gellius Horace Jerome Juvenal Livy Lucan Lucretius Macrobius Marcus Aurelius Martial Orosius Ovid Petronius Phaedrus Plautus Pliny the Elder Pliny the Younger Priscian Propertius Quintilian Quintus Curtius Rufus Sallust Seneca the Elder Seneca the Younger Servius Sidonius Apollinaris Statius Suetonius Symmachus Tacitus Terence Tertullian Tibullus Valerius Antias Valerius Maximus Varro Velleius Paterculus Verrius Flaccus Virgil Vitruvius Greek Arrian Cassius Dio Diodorus Siculus Dionysius of Halicarnassus Dioscorides Eusebius of Caesaria Galen Herodian Josephus Pausanias Philostratus Phlegon of Tralles Photius Plutarch Polybius Porphyrius Procopius Strabo Zonaras Zosimus Major cities Alexandria Antioch Aquileia Berytus Bononia Carthage Constantinopolis Eboracum Leptis Magna Londinium Lutetia Mediolanum Pompeii Ravenna Roma Smyrna Vindobona Volubilis Lists and other topics Cities and towns Climate Consuls Distinguished women Emperors Generals Gentes Geographers Institutions Laws Legacy Legions Nomina Tribunes Wars and battles Fiction Films Retrieved from `` https://en.wikipedia.org/w/index.php?title=Roman_concrete&oldid=823101769 '' Categories : Ancient Roman architecture Concrete Concrete buildings and structures Building materials Masonry Pavements Sculpture materials Ancient inventions Italian architecture Architectural history Lost inventions Hidden categories : Pages using citations with accessdate and no URL Talk Contents About Wikipedia Boarisch Català Čeština Dansk Deutsch Español Esperanto Français Galego Hrvatski Italiano עברית Latina Nederlands 日本 語 Norsk Occitan Polski Português Русский Slovenščina Srpskohrvatski / српскохрватски Suomi Svenska Türkçe Edit links This page was last edited on 30 January 2018, at 07 : 11. 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Question: when was the earliest use we know about for concrete
Answer: about 150 BC