Modified Proctor Test – ASTM D1557

The soil forms the basis and the foundation of every structure. Proper and accurate tests are to verify the safety and reliability of the soil mass and content. The Modified proctor compaction test plays a vital role in ascertaining the structure strength and durability. The tests are relevant in:

• The test improves the optimum density of soil without affecting the soil structure.
• The process works handy in decreasing the soil permeability that would lead to structure contraction or shrinking.
• The test increases the soil strength and compatibility by accommodating the soil bearing capacity.
• Modified compaction tests help in controlling dams which may lead to disastrous leakage.
• The test procedure increases the soil erosion resistance by increasing the soil settlement and firmness.

Modified Proctor Test Procedure – ASTM D1557 PDF Free Download

The modified proctor test procedure is among the easiest methods that effectively help in determining the soil moisture content. Follow the below guidelines to give accurate results.

• Collect the right amount of air-dried soil and pass it through the sieve. Add a significant amount of water and mix thoroughly to make the soil
• dumpy.
• Accurately weigh the mold plus the base place attachment. By using the standard compaction tools, attach the soil base compartment with the sample soil.
• Carefully distribute the number of mold puffs uniformly to cover at least a third of the mold height. Take off the collar by gently striking off the estimation of the compacted soil. Ensure to weigh both the compacted soil and the mold.
• After subjecting the soil samples for at least 25 blows, the soil reduces its height due to high compatibility. Collect the sample soil to determine the amount of moisture content.
• For successful results, extend the collar to enable the soil to level up and proper compaction.
• Constantly record the weight of both the mold and the compacted soil to note the difference in soil water content.
• Spread the sample soil on a tray and collect the sample amount of the specimen for further water content variation.
• For more accurate moisture content results, repeat the same procedure by adding more water to the soil sample.