Concrete

Concrete good in compressive stress but it was totally poor in tensile stress. Normally for floor slap we have to add in some steel bar for reinforce the concrete, that we call reinforce concrete. Column, foundation, beam are also steel bar when we cast the concrete. During casting the concrete, we put in the steel bar at the lower part of concrete to handle the tensile strength. Concrete act as a important material in construction, like different grade of concrete will depend on different type of building or environment requirement. Why concrete must add in aggregate? Because aggregate will easy to form the shape and increase the strength of the structure to able support high loads. When we put the concrete in to form work, we also need to using vibrator to vibrate the aggregate at the bottom to separate evenly and fill in all the bubble inside.