alleryStart learning →Per §3.4, sea water typically reduces the 28-day strength of concrete by the order of:
ANegligible — under 1 percent
BMore than 80 percent
CAbout 40 to 50 percent
DAbout 10 to 15 percent
Answer & Solution
Correct answer: D. About 10 to 15 percent
1. §3.4 states: 'The reduction in strength of concrete may be of the order of 10 to 20 percent.' Later in the same section: 'sea water slightly accelerates the setting time… But it reduces 28 days strength of concrete by about 10 to 15 percent.'
2. The loss can be partly compensated by redesigning the mix.
_Source: IGNOU ET-522 Block-1 Unit-3 Water, §3.4, p. 43_
Keep practising Water for Concrete
Browse all Water for Concrete questions for B.Tech Civil, or explore more Civil Engineering topics.
Related questions
Per §3.4, sea water is most strictly to be AVOIDED for use as mixing water in:Per §3.4, sea water has an average salinity of approximately:Per Table 3.2, the recommended pH range of mixing water for concrete is:Per Table 3.2, the tolerable limit on TOTAL DISSOLVED SALTS in mixing water for concrete iPer §3.3.2, which of the following salts in mixing water is described as 'completely destr