Large Prestressed Concrete Tanks for Water & Sewage Treatment Plants in India

As concrete is weak in tension, reinforced concrete begin to develop cracks even at ordinary working stresses when the tensile stress in steel is only 850 to 1250 kg/cm² , These cracks are definitely minute and one school of thought does not attribute any harm to it. A 0.25 mm gap at least is required before the reinforcement will be corroded by moisture changes of weather, while the cracks developed at working stresses are only very small.