Standard Proctor test uses which hammer weight?

Standard Proctor test uses which hammer weight?

• A. 10 lb hammer
• B. 15 lb hammer
• C. 2 lb hammer
• D. 5 1/2 lb Hammer

Answer: (D)

In the Standard Proctor test, the energy delivered to the soil is defined by a specific hammer weight and a fixed drop height. For the standard procedure, a hammer weighing 5.5 pounds is dropped from 12 inches. This sets the energy level used to compact the soil and determine its maximum dry density and optimum moisture content. A heavier hammer or a taller drop is used in the Modified Proctor test, while a 2-pound or other non-standard weight isn’t used in this method. So the hammer weight for the Standard Proctor is 5 1/2 pounds.

In the Standard Proctor test, the energy delivered to the soil is defined by a specific hammer weight and a fixed drop height. For the standard procedure, a hammer weighing 5.5 pounds is dropped from 12 inches. This sets the energy level used to compact the soil and determine its maximum dry density and optimum moisture content. A heavier hammer or a taller drop is used in the Modified Proctor test, while a 2-pound or other non-standard weight isn’t used in this method. So the hammer weight for the Standard Proctor is 5 1/2 pounds.