Stone and an early form of concrete
the used the arches to build magnificent art and so they could use less bricks and also so you can go threw the bridge or wall! :)
Cement was used by the Romans to build the colosseum. The Romans invented cement and the material they invented was also water proof which allowed for bridges and fountains to be built.
Arches!
The Romans rarely combined arches and columns. Large Roman buildings, the bridges and the bridgework of aqueducts made extensive use of the simple (barrel) arch and the vaulted arch (or vault, for vaulted roofs). Arches did not need columns. When the Romans combined arches with columns it was for decorative purposes. Roman ttemples were based on Greek models and were post-and-lintel structures resting on columns. Because of this, they did not have arches.
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.
They are called Roman triumphal arches such as the Arch of Titus
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Romans aqueducts had arches when the water conduit was placed on top of arched bridgework. This was done when the aqueduct crossed a river or a valley or when a gradient was needed to keep a gradient to keep the water flowing in flat areas. Romans aqueducts consisted mostly of underground conduits.
tools
use nothing
the romans helped the british in many ways such as how to build villas and use stone.
The Romans built structures called triumphal arches to commemorate their military victories. Triumphal arches were typically decorated with reliefs and inscriptions depicting the conquests and achievements of Roman generals.