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Stone and an early form of concrete
Triumphal arches were stone arches built by the Romans. They would commemorate either a military victory or a public event. Other cultures took the idea and have built triumphal arches to celebrate their own triumphs.
It was built by the Romans...in Rome. It was said to be the grandest of gladiatorial arenas in the Roman Empire. It still stands today.
The Colosseum was clad in travertine stone with three storeys of arches topped by a fourth storey of pilasters and small rectangular windows. The arches in each storey contained statues of Gods and Emperors. The two main entrances were marked by giant porticoes topped by winged horses pulling chariots.
Concrete and the vaulted arches were keys to the support of the Colosseum. It was built with a mixture of concrete and stone. The Romans were in the middle of developing concrete and were unsure of its strength and durability, so they used stone as well. Roman concrete proved to be very strong and long lasting and it is mainly due to this that it has survived. Moreover, unlike stone, it cannot be quarried to be used as building material elsewhere, which is the main reason why so many Roman buildings are in ruin. The great load-bearing strength of the vaulted arch was also very important in supporting the Colosseum.
The Romans did not specifically create any one material to built aqueducts and arches. Their arches were mainly stone, some faced with concrete, depending on the purpose for the arch. The aqueducts were large diameter ceramic pipes. On the above ground aqueducts, these ceramic pipes rode atop the arches and they were the aqueducts in the underground ones. The 10th Legion's ceramic workshop has recently been found in Israel and it shows their ceramic kiln rooms and workrooms.
Travertine, limestone, concrete, volcanic stone, pumice
they made the Colosseum out of cement for the base with marble on the outside and marble for the seats, they also used sand on the ground so it would soak up the blood.
The Roman Colosseum was constructed out of brick, concrete, and stone.
No, the Greeks and Etruscans used the arch before them, and versions of round arches date back at least as far as Israel in 1850 BC. But the Romans greatly improved them with multiple styles. The Romans were the first to widely employ the "flattened" or non-hemispheric arch, as well as the domed stone roof.
the stone from the colosseum was used 2 build new buildings
Cement and stone