It can actually be either one. I personally think that "what do you mean" is "correct" but any one dividual can say how or what do you mean. Just depends on what you are meaning to say and what what...
Also known as Cyclopean Concrete, this is a variety of concrete consisting of large sized stones(Plums) with interstices filled with concrete. Used mostly in mass concrete works like concrete gravity...
Concrete is a well proportioned mixture of cement and other cementitious materials such as fly ash and slag cement, coarse aggregate made of crushed stone, fine aggregate such as sand, water, and...