alleryStart learning →For complete hydration of Portland cement, the total water required as a percentage of cement weight is approximately:
AAbout 23 percent
BAbout 30 percent
CAbout 38 percent
DAbout 50 percent
Answer & Solution
Correct answer: C. About 38 percent
1. §1.6.1 (after Figure 1.3): bound water is 23 percent and gel-pore water is about 15 percent
so 'a total of 38 percent of water by weight of cement is required for complete hydration and to occupy the space within the gel-pores.'
2. Adding more than 38 percent leaves capillary cavities and weakens the concrete.
_Source: IGNOU ET-522 Block-1 Unit-1 Cement, §1.6.1, p. 10_
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