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A typical mixture of concrete will be 10 to 15% cement, 60 to 75% aggregate, and 15 to 20% water.
what is the weight of salt water of one cubic meter
Depends. A cubic meter of WHAT? If it's a cubic meter of lead, it would weigh quite a bit. A cubic meter of air, not so much. The standard substance that is used to relate metric measurements to each other is water. The "gram" was defined as the mass (not weight, but similar) of one cubic centimeter of water at normal temperature. There are 1 million cubic centimeters in a cubic meter, so a cubic meter of water would have a mass of 1 million grams, or 1,000 kilograms, or 1 metric ton. To obtain the mass of 1 cubic meter of some other substances, simply multiply the specific gravity of the substance by the mass of a cubic meter of water.
If you mean volume you need the thickness as well. You've quoted only area. Then if you mean mass, you'd need the density too. I suspect you meant to ask about the weight of 1 cubic meter of cement. Quoting directly from the source given below: "The unit weight of concrete (density) varies depending on the amount and density of the aggregate, the amount of entrained air (and entrapped air), and the water and cement content. A normal weight concrete weighs 2400 kg per cubic meter or 145 lbs per cubic foot (3915 lbs per cubic yard)."
It depends on the specific weight of the special sort of stones. 1 cubic meter of water weighs 1 tonne.