1) with river sand2) with lime3) with fly ash please give the reason too.
cement or concrete. Cement is baked lime. Concrete is a mixture of sand gravel and cement. Fly ash is more of a lubricant and helps to give you a smoother finish. A basic mixture for concrete is 1 cement 2 gravel and 3 sand. To increase the basic strength add more cement as cement is the binder. To much cement and the result will be crumbly. The more sharp points in the type of sand or the more surface texture of the rock increases strength. reinforcement wire or bar will increase structure strength. Dan
