Angles can be used to make trusses, hold fasts etc and angle pairs for making 'T' section or square hollow section. However you can use it with your ingenuity for many things viz chairs, end stubs to reduse Anchorage length, door frame, shutterings, in lap weldings, make sharp edges.

It is not so simple. A very dense concrete is not necessarily strong in compression. You may like to know about open grading used for economical concrete.... new trend. The question in the first ...

As a thumb rule, more the density, more will be the compressive strength. But it is not always true. The compressive strength depends on many factors. Density gives a general idea as to how much was t...