Concrete is the most important construction materials.
Fine powder and cement gray color, is mixed with
water and other materials such as sand, gravel and
stone fragments, for the manufacture of concrete.
Concrete it is relatively cheap and easy to work. And
when it is mixed in the beginning, be easy to cast in
different molds. Concrete freeze quickly and become
strong material lasts for a long time with out having to
be in need of great care.
This beginning to use reinforced concrete in about 1900,
where they were used in tires and walls and floors of
different buildings, reinforced concrete and concrete are
normal plus iron.
1- How many concrete that we talked about ?
A- It's one concrete.
.concretesB- It's two
C- It's three concretes .
2- What is called the iron inside the concrete?
A- It's called the Reinforced Concrete .
B- It's called the Ordinary concrete .
C- It's called the Ready concrete.
3- When was the use of reinforced concrete?
A- Was used in 1996 years.
B- Was used in 1900 years.
C- Was used in 1993 years.