<P> Reinforcing bars in masonry construction have been used since at least the 15th century ( 2,500 meters of rebar was used in the Château de Vincennes ) . During the 18th century , rebar was used to form the carcass of the Leaning Tower of Nevyansk in Russia , built on the orders of the industrialist Akinfiy Demidov . The cast iron used for the rebar was of high quality , and there is no corrosion on the bars to this day . The carcass of the tower was connected to its cast iron tented roof , crowned with one of the first known lightning rods . However , it was not until the mid-19th century that rebar displayed its greatest strengths with the embedding of steel bars into concrete , thus producing modern reinforced concrete . Several people in Europe and North America developed reinforced concrete in the 1850s . These include Joseph - Louis Lambot of France , who built reinforced concrete boats in Paris ( 1854 ) and Thaddeus Hyatt of the United States , who produced and tested reinforced concrete beams . Joseph Monier of France is one of the most notable figures for the invention and popularization of reinforced concrete . As a French gardener , Monier patented reinforced concrete flower pots in 1867 , before proceeding to build reinforced concrete water tanks and bridges . </P>
<P> Reinforcing bars in masonry construction have been used since at least the 15th century ( 2,500 meters of rebar was used in the Château de Vincennes ) . During the 18th century , rebar was used to form the carcass of the Leaning Tower of Nevyansk in Russia , built on the orders of the industrialist Akinfiy Demidov . The cast iron used for the rebar was of high quality , and there is no corrosion on the bars to this day . The carcass of the tower was connected to its cast iron tented roof , crowned with one of the first known lightning rods . However , it was not until the mid-19th century that rebar displayed its greatest strengths with the embedding of steel bars into concrete , thus producing modern reinforced concrete . Several people in Europe and North America developed reinforced concrete in the 1850s . These include Joseph - Louis Lambot of France , who built reinforced concrete boats in Paris ( 1854 ) and Thaddeus Hyatt of the United States , who produced and tested reinforced concrete beams . Joseph Monier of France is one of the most notable figures for the invention and popularization of reinforced concrete . As a French gardener , Monier patented reinforced concrete flower pots in 1867 , before proceeding to build reinforced concrete water tanks and bridges . </P>
when did they start using rebar in concrete
when did they start using rebar in concrete
the mid-19th century
the mid-19th century