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It is the strength in pounds per square inch of a material at which it will be pulled apart.
Tensile strength is given in ksi. To get pounds you need to know the area. Pounds = strength x area. For example if the specimen is 100 ksi strength and area 1 sq inch, pounds = 100 x 1 = 100 kilopounds = 100000 pounds. f the specimen is 100 ksi strength and area 2 sq inch, pounds = 100 x 2 = 200 kilopounds = 200000 pounds. In any case strength in ksi is the same for a given material and that is why ksi is used.
The force required to break concrete depends on various factors such as the type of concrete, its age, and the specific conditions of the concrete. In general, the compressive strength of concrete is measured in pounds per square inch (psi). For typical concrete mixes, the compressive strength can range from about 2,500 psi to over 10,000 psi. Therefore, the force required to break concrete can vary widely, but it typically takes thousands of pounds of force to break through concrete.
There is no flat conversion from volume to weight; it all depends on the material you need to weigh. Based on some quick searches, it looks like a gallon of sand is approximately 200 oz, or 12.5 pounds. So based on that measurement, it would be about 62.5 pounds. However, not all sand is created equal, and the sand you're using may be coarser or finer or made of an entirely different material. I would take a smaller measurement of 1 or 2 cups, weigh that in ounces, then make your conversion.
According to the related link below; the required amount to cover 1 square yard with 4 inches of concrete is 6.6 60 pounds bags.