*3.2. Flow*

As shown in Table 5 and Figure 3, with a W/B ratio of 0.4 and a fixed GGBFS content of 20%, the flow is 15.6~14.2 cm; with a W/B ratio of 0.5, the flow is 19.9~18.7 cm; with a W/B ratio of 0.6 and a GGBFS content of 20%, the flow value is 21.7~20.9 cm. The flow value is greatly increased with the W/B ratio, the mortar flow increases as the water consumption increases, and the overall workability of the mortar is enhanced.

**Table 5.** Flow and flow ratio of cement mortar with different W/B ratios and waste PE (unit: cm).


\* FR: Flow ratio of PE fiber material added specimen to the control specimen without PE fiber material added.

**Figure 3.** Flow of cement mortar with different W/B ratios and waste PE.

With a W/B ratio of 0.5 and 0%, 1%, 2%, 3%, and 4% for the waste PE, the cement mortar shows flow values of 19.9, 19.7, 19.4, 18.9, and 18.7 cm, respectively. When the content is increased from 1% to 4%, the flow is reduced by 1~6%, meaning the flow is decreased as the content of waste PE is increased.

#### *3.3. Setting Time*

As shown in Table 6 and Figure 4, with a fixed furnace slag content of 20%, a W/B ratio of 0.4, and 1% waste PE, the initial setting time and final setting time of the cement mortar are 315 min and 382 min, respectively; when the W/B ratio is 0.5, the initial setting time is 387 min and the final setting time is 505 min; when the W/B ratio is 0.6, the initial setting time is 468 min and the final setting time is 625 min. This indicates that the setting time increases with the W/B ratio. As the total water consumption is increased with the W/B ratio, the hydration heat reaction slows down and the setting time increases.


**Table 6.** Setting time of cement mortar with different W/B ratios and waste PE.

**Figure 4.** Setting time of cement mortar with different W/B ratios and waste PE.

When the W/B ratio is 0.5, the content of waste PE is 0%, 1%, 2%, 3%, and 4%, the slag content is 20%, the initial setting time is 401~356 min, and the final setting time is 518~474 min, meaning that the setting time is shortened with increasing content of waste PE.
