Verification of Nominal Cover Requirements Specified by is 456:2000
K Ganeshbabu1, B Kameswara Rao2, Meer Sohail Ali3, A. Bala Krishna4
1Ganeshbabu.K, Department of Civil Engineering, Koneru Lakshmaiah Education Foundation Deemed to be University, Guntur (A.P), India.
2B. Kameswara Rao, Department of Civil Engineering, Koneru Lakshmaiah Education Foundation Deemed to be University, Guntur (A.P), India.
3Meer Sohail Ali, Department of Civil Engineering, Koneru Lakshmaiah Education Foundation Deemed to be University, Guntur (A.P), India.
4A. Bala Krishna, Department of Civil Engineering, Koneru Lakshmaiah Education Foundation Deemed to be University, Guntur (A.P), India.
Manuscript received on 30 April 2019 | Revised Manuscript received on 14 May 2019 | Manuscript Published on 28 May 2019 | PP: 179-183 | Volume-7 Issue-6C2 April 2019 | Retrieval Number: F10330476C219/2019©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: At present Corrosion of reinforced concrete structures is one of the serious issues involving the durability and serviceability of the structure. Though a Reinforced Concrete Structure is designed for a service life, it is not lasting longer. The durability of concrete is affected by corrosion. Adequate cover is required for any reinforced concrete structure in order to protect it from corrosion. Indian code (IS 456: 2000) has specified the cover based on durability requirement as well as for fire requirements. British code (BS:8110), New Zealand code (NZS 3101: Part-1(2006)) and American code (ACI 381-95) has also given some code provisions for concrete cover. It is observed that the Indian code has not taken factors like concrete quality,cementitious material and water/cementitious ratio. So, the Indiancode requires the above considerations. Acceleratedcorrosion by Impressed Current Technique is used in concrete durability tests.In this study, the behavior of corrosion in steel embedded in different combinations (grades and fly ash replacement) of concrete at a constant cover influenced by the constant current potential of 60V was experimentally investigated.The composite cement was prepared by using Ordinary Portland cement (OPC) and Fly Ash. Steel bars(ø10 mm)were weighted to determine the corrosion effects in terms of weight loss.The cubes of dimension 15 cm x 15 cm x 15cm with M30 and M40 grades of concrete with different OPC combinations (OPC + 30% of Fly ash, OPC + 60% of Fly ash and OPC) were castedby placing a rounded steel bar with a cover of 4 cmfrom a face of cube.
Keywords: Cover, Durability, Corrosion, Current, Fly Ash, Steel.
Scope of the Article: Materials and Durability