The HMA sample is being testing under a series of creep and

The HMA sample is being testing under a series of creep and recovery loading using AMPT to predict rutting performance. The flow number usually indicates the moment when the (flow begins..Choose the proper word for the blank. Steady Secondary Permanent Tertiary

Solution

Steady should be the proper word to fill.

Because flow number is defined as the number of load pulses when the minimum rate of change in permanent strain occurs during the repeated load test.

The minimum rate of change in permanent strain means steady flow.