Rebar And Rebar Benders
Used in concrete and masonry structures, concrete reinforcing steel is generally known as rebar
. Normally it is made from carbon steel and ridges are inserted into the concrete for anchoring that is better mechanically. The ridges assist the transfer of the load between the steel and concrete. Steel provides tensile strength to a material. Concrete provides compressive strength. A block that is concrete is stopped from crumbling by the use of these two materials together. A recent example involves the collapse of much newer buildings in the Mexico City earthquake, where many older structures were relatively unharmed. The reason is that newer buildings do not use rebar, only solid bar that is smooth. The concrete did not receive any compression strength.
The measurements of rebar are in increments of fractions of 1/8. These run from #3 bar all the way to #18 bar. Therefore, a #4 bar would be 4/8 or in diameter and a #8 bar would be 1 in diameter. You can get rebar in different specifications and grade levels. These levels provide various yield strength, chemical composition, ultimate tensile strength, and percentage of elongation.
The designation of grade is the equivalent of the minimum yield bar strength. Grade 40 rebar minimum yield strength is 40ksi, grade 60 rebar minimum yield is 60ksi, and grade 75 rebar minimum yield is 75ksi. The majority of rebar used in concrete construction is grade 60. Grade 40 is usually used for residential rebar application. This includes low stress concrete construction such as sidewalks. Bridges, power plants, and other concrete products that are heavy duty are where grade 75 is employed.
Rebar is normally made in 20 foot long pieces, so there has to be a way to further fabricate the bars. That is, bending and shearing must conform to the drawings the engineers have provided. You can find many sizes of benders and rebar shears. Bar size and capacity are related, as mentioned earlier. Whenever a residential concrete mason works with #3 thru #6 bar, he usually sources a machine that is able to cut and bend #8 bar. The reason for this is that sometimes more than one bar at a time is processed. This will speed up production, making the extra capacity very helpful.
It is very important to figure the right capacity when you are choosing equipment to work with heavy concrete construction. When you build bridges and buildings, you should use a greater diameter bar, a higher grade of steel, and heavier capacity machinery. You should always choose an experienced, knowledgeable supplier who can help you decide on the right capacity for your machine.
by: Michael Headingten
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