*2.6. Unconfined Compressive Strength Experiment*

After the designated curing time was reached, specimens were tested for the unconfined compressive strength (*q*u). A strain-controlled apparatus (YYW-2 type, Nanjing Soil Instrument Factory CO., LTD., Jiangsu, China) was used to test unconfined compressive strength. Each test was performed thrice in parallel.
