IS 1786 -1985 Code Book PDF free download

IS 1786 -1985 Code Book PDF free download

This Indian Standard ( Third Revision ) was adopted by the Indian Standards Institution on 1 May 1985, after the draft finalized by the Joint Sectional Committee for Concrete Reinforcement had been approved by the Civil Engineering Division Council.  Deformed bars for concrete ‘reinforcement are being produced in the country for many years, the main processes being hot rolling or hot rolling followed by cold twisting. In the past decade there has been an increasing demand for higher strength deformed bars ( 415 N/mmz, Min, yield strength/O.2 percent proof stress being the most common j. This high yield strength was being first achieved by raising carbon and manganese and to a great extent by cold twisting. In addition IO this, there has been considerable demand for larger diameter bars with similar strength, elongation, weldability and bendability as that of small size bars. Along with this, the;e is also a need for these steel bars to be welded and fabricated on the site easily. For this, strength and ductility have to be achieved at the lowest possible carbon content.  Technological advances during the last few years in the field of deformed bar production have helped in meeting all the above requirements together. Microalloying with Nb, V, Ti and B, in combination or individually, and thermomechanical treatment process are worth mentioning in this field. With these two processes higher strength values could be achieved at low carbon levels even in large diameter bars.  Two Indian Standard specifications, namely, IS : 1139-1966 ‘Specification for hot rolled mild steel, medium tensile steel and high yield strength steel deformed bars for concrete reinforcement ( revised )’ and IS : 1786-1979 ‘Specification for cold-worked steel high strength deformed bars for concrete reinforcement r second revision )’ covered deformed bars for concrete reinforcement, To take advantage of the technological changes, it is thought necessary to merge these two specifications giving :IEE? option of the manufacturing process to the producers so as to meet nlZ the requirements of the specification. Hence the revision of IS : 1139- 1966 and IS : 1786-1979 has been prepared combining them into a single specification with modified designation and title. In this revision the requirements of chemical composition have been modified, a new strength grade Fe 550 has been introduced, Fe 250 and Fe 350 strength grades have been deleted, requirements of modified bar geometry have been made applicable to hot-rolled bars in addition to cold-worked bars; further 4, 5 and 7 mm nominal sizes have been introduced; and a few other changes found necessary as a result of experience gained have been incorporated. 8.4 For the purpo.qe of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS : 2-1960*. The number of significant places retained in the rounded off value shoilld be the same as that of the specified value in this standard.

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