Additional Requirement in Concrete Cover Specifications as Per IS-456(2000) For Durable R.C. Structures
M. N. B. S. Anvith1, A. Venkateswara Rao2, B. Kameswara Rao3
1M. N. B. S. Anvith, Department of Civil Engineering, Koneru Lakshmaiah Education Foundation Deemed to be University, Guntur (A.P), India.
2A. Venkateswara Rao, Department of Civil Engineering, Koneru Lakshmaiah Education Foundation Deemed to be University, Guntur (A.P), India.
3B. Kameswara Rao, 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: 174-178 | Volume-7 Issue-6C2 April 2019 | Retrieval Number: F10320476C219/2019©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: Concrete cover to the reinforcement is to protect the reinforcement against corrosion. Corrosion of steel is one of the factors which influences the durability and serviceability of structure. Presence of moisture, humidity, oxygen and exposure conditions causes corrosion of reinforcing bars. Indian standard code(IS456:2000) specifies cover requirements in clause 26.4, table 16 and table 16A not considered the type of cementitious material, minimum content of cementitious material, and maximum water/binder ratio. Whereas the international codes such as ACI-318, BS-8110,CP-65 and NZs-3101 have considered the above parameters in specifying the concrete cover requirements. In this present study, the effect of the type of cementitious material, content of cementitious material, water/binder ratio etc. are studying by replacing cementitious material. Accelerated corrosion 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 GGBS replacement) of concrete at a constant cover influenced by the constant current potential of 60V was experimentally investigated. Steel bars (ø10 mm) were weighted to determine the corrosion effects in terms of weight loss and behavior of corrosion is determined. The cubes of dimension 15 cm x 15 cm x 15cm with M30 and M40 grades of concrete with different OPC combinations (OPC + 40% of GGBS, OPC + 70% of GGBS and OPC) were casted by placing a rounded steel bar with a cover of 4 cm from a face of cube.
Keywords: Cover, Corrosion, Cementitious, Reinforcement.
Scope of the Article: Concrete Structures