For the Moisture-Density Relation Test (MDR) specified as T - 180, what is the required weight of the compaction rammer?

The Moisture-Density Relation Test (MDR), also known as the Proctor test, is a fundamental method in civil engineering to determine the optimal moisture content at which a given soil type will achieve its maximum dry density when compacted. This test is specified by various standards, including T - 180, and involves the use of a compaction rammer to compact the soil sample.

The standard for the compaction rammer in T - 180 specifies that it should weigh 4.54 kg (10 lb). This weight is carefully chosen to ensure that the energy applied to the soil during compaction is consistent and provides reliable and comparable results across different tests. The specified weight of 4.54 kg aids in achieving proper compaction of the soil sample, allowing for accurate measurements of the soil's maximum dry density and optimal moisture content.

Other weights listed in the options do not correspond to the specifications outlined for the T - 180 test, as the compaction energy produced by those different weights would likely lead to discrepancies in the results. Thus, the choice of 4.54 kg is essential for maintaining standardization and ensuring the validity of the test results.