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For the construction of concrete, the concentration of sulfate anhydride in mixed water should not exceed ______.
1. 2000 ppm
2. 1000 ppm
3. 3000 ppm
4. 4000 ppm

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Correct Answer - Option 3 : 3000 ppm

Explanation:

  • Generally, the quality of water for construction works is the same as drinking water.
  • This is to ensure that the water is reasonably free from such impurities as suspended solids, organic matter, and dissolved salts, which may adversely affect the properties of the concrete, especially the setting, hardening, strength, durability, etc. 
  • Brackish water contains chlorides and sulfates. When chloride does not exceed 10,000 ppm and sulfate does not exceed 3,000 ppm the water is harmless, but water with even higher salt content has been used satisfactorily.
  • The water quality for construction shall be tested or monitored regularly, as it affects the overall strength of concrete.

For plain and reinforced cement concrete permissible limits for solids shall be as follows:

Types of solids Permissible limits
Organic matter 200 mg/l

Suspended matter

2000 mg/l

Sulfates 400 mg/l
Chloride

2000 mg/l (for plain concrete)

500 mg/l (for reinforced concrete)

Inorganic 3000 mg/l

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