Analysis and Design Of Overhead Service Reservoir
(For 75,000 Liter Capacity)
Dr. D.P. Gupta1, Er. Arvind Dewangan2, Er. Mukesh Kumar3, Er. Manik Goyal4, Mr. Rajive kumar Saini5
1 Prinicipal – Haryana College of Technology & Management, Kaithal, Haryana, India.
2 Department of Civil Engg. . Haryana College of Technology & Management, Kaithal, Haryana, India. Email: email@example.com
3 Department of Civil Engg. Deptt. Haryana College of Technology & Management, Kaithal, Haryana, India, Email: firstname.lastname@example.org
4 Asstt. Prof. – Jan Nayak Chaudhary Devi Lal Vidyapith, Sirsa, Haryana, India.
5 Lecturer in Engg. Physics, Haryana College of Technology & Management, Kaithal, Haryana, India.
In the construction of concrete structure for the storage of water & other liquid the imperviousness of concrete is most essential .The permeability of any uniform and thoroughly compacted concrete is given mix proportion is mainly depend on the water cement ratio. The increase in water cement ratio results in increase the permeability. The decrease in water cement ratio may cause compaction difficulties and prove to be harmful also. For a given mix made with particular material there is a lower limit to the water cement ratio which can be used economically on any job. It is essential to select a richness of mix compatible with available aggregates whose particle shape and grading have an important bearing on workability, which must be suited to the means of compaction selected. Efficient compaction preferably by vibration is essential. It is desirable to specify cement content sufficiently high to ensure that through compaction is obtainable while maintaining a sufficient low water cement ratio. The quantity of cement should not be less than 330 kg/m3 of concrete. It should also be less than 530 kg/m3 of concrete to keep the shrinkage low. In thicker section ,where a reduction in cement content might be desirable to restrict the temperature rise due to cement hydration ,lower cement content is usually permissible. It is usual to use rich mix like M 30 grade in most of the water tanks. Design of liquid retaining structure has to be based on the avoidance of cracking in the concrete having regarded to its tensile strength. It has to be insured in its design that concrete does not crack on its water face. Cracking may also result from the restraint to shrinkage, free expansion & contraction of concrete due to temperature and shrinkage & swelling. Due to moisture effects. Correct placing of reinforcement, use of small sized bars and used of deformed bars lead to a diffused distribution of cracks. The risk of cracking due to over all temperature and shrinkage effects may be minimized by limiting the changes in moisture content and temperature to which the structure as a whole is subjected. Cracks can be prevented by avoiding the use of thick timber shuttering which prevent the escape of heat of hydration from the concrete mass. The risk of cracking can be minimized by reducing the restraints on the free expansion or contraction of the structure. For long wall or slabs founded at or below the ground level, restraints can be minimized by founding the structure on a flay layer of concrete with interposition of sliding layer of some material to break the bond and facilitate movement.
However, it should be recognized that common and more serious causes of leakage in practice, other than cracking, are defects such as segregation and honey combing and in particular all joints are potential source of leakage.
Sub-Area: Structural Mechanics.
Broad Area: Civil Engg.
International eJournal of Mathematics and Engineering
Volume 1, Issue 1I, Pages 218-236