What action should be taken if the rammer is adjusted or repaired in Standard/Modified Proctor tests?

In the context of Standard and Modified Proctor tests, which are used to determine the optimum moisture content and maximum dry density of soils, it's essential that all equipment maintains specific performance standards throughout testing procedures. If a rammer is adjusted or repaired, it can impact the results of the tests, as the rammer's weight, fall height, and impact energy need to conform to established specifications.

Rstandardizing the rammer is crucial after any adjustments or repairs because it ensures that the equipment is functioning according to the precise criteria defined by the testing standards. This process validates that the rammer will deliver consistent and reliable results during the compaction testing of soils. Without restandardization, there could be uncertainty regarding how the adjustments or repairs may have altered its performance characteristics, leading to inaccurate test results.

Cleaning the rammer, while beneficial for maintenance, does not directly address issues of measurement accuracy or compliance with testing standards. Similarly, recalibrating typically refers to adjusting measuring devices; in this case, it is the need for restandardization that clearly lays the groundwork for ensuring precise testing compliance. Thus, restandardizing is the correct action to maintain the integrity of the test results.