*3.5. Water Absorption*

The water absorption test results are shown in Table 6. While the data show that water absorption of WCSP is just slightly lower than that of GB, the difference with respect to swelling is considerable. In fact, WCSP shows virtually no swelling, whereas for almost the same water uptake, GB undergoes a 5% expansion. In the case of WCSP, most of the free water in the mortar had evaporated about 6 days after removal from the mold based on the samples weight. Therefore, the cement was not fully cured leading to shrinkage in water. In addition, the negative value may be caused by the erosion of the specimen due to the flow of water during the test.

**Table 6.** Moisture absorption characteristics of WSCP and GB according to ASTM D1037-12.

