The concentration of inorganic solids in water to be used in reinforced cement concrete construction should not be more than:
3000 mg/L
Water Quality Standards for Reinforced Cement Concrete
Water is a critical component in the production of concrete. The quality of water used significantly influences the properties of fresh and hardened concrete, including strength, durability, and setting characteristics. Excessive concentrations of inorganic solids, often quantified as Total Dissolved Solids (TDS), can be detrimental.
Understanding Inorganic Solid Limits in Concrete Water
- International and national standards (e.g., IS 456:2000) set permissible limits for impurities in water intended for use in plain and reinforced concrete construction.
- These limits are established to prevent adverse effects such as delayed setting, reduced strength, corrosion of reinforcement, and efflorescence.
- The maximum allowable concentration of total dissolved solids (including inorganic solids) in water for RCC construction is generally stipulated as 3000 mg/L.
Identifying the Correct Concentration Limit
Based on established construction material standards, the concentration of inorganic solids in water meant for reinforced cement concrete (RCC) work should not surpass 3000 mg/L. This ensures the concrete achieves its desired strength and durability without detrimental effects from dissolved salts.
Therefore, the correct option reflecting this limit is 3000 mg/L.
Important Questions from Miscellaneous
A stone is thrown horizontally from the top of a 20 m high building with a speed of 12 m/s. It hits the ground at a distance R from the building. Taking g = 10 m/s2 and neglecting air resistance will give :
A sphere of volume V is made of a material with lower density than water. While on Earth, it floats on water with its volume f1V (f1 < 1) submerged. On the other hand, on a spaceship accelerating with acceleration a < g (g is the acceleration due to gravity on Earth) in outer space, its submerged volume in water is f2V. Then:
A railway wagon (open at the top) of mass M1 is moving with speed v1 along a straight track. As a result of rain, after some time it gets partially filled with water so that the mass of the wagon becomes M2 and speed becomes v2. Taking the rain to be falling vertically and the water stationery inside the wagon, the relation between the two speeds v1 and v2 is :
Consider the following statements:
1. Distance between the longitudes becomes zero on North Pole and South Pole.
2. Distance between the longitudes is maximum on the Equator.
3. Number of longitudes is more than number of latitudes.
Which of the statements given above is/are correct?
One block of 2⋅0 kg mass is placed on top of another block of 3⋅0 kg mass. The coefficient of static friction between the two blocks is 0⋅2. The bottom block is pulled with a horizontal force F such that both the blocks move together without slipping. Taking acceleration due to gravity as 10 m/s2, the maximum value of the frictional force is :
