IJE TRANSACTIONS A: Basics Vol. 30, No. 10 (October 2017) 1464-1470    Article in Press

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S. Borzouyi Kutenayi, S. R. Kiahosseini and M. H. Talebpour
( Received: May 28, 2017 – Accepted in Revised Form: July 07, 2017 )

Abstract    Many parameters are influenced by the diffusion of chloride on concrete in marine environments and these can affect concrete quality. In this study, the effect of water to cement ratio of 0.35, 0.40 and 0.45 on corrosion resistance and compressive strength of reinforced concrete was evaluated. Moreover, different percentages of micro silica (SiO2) including 5, 7.5 and 10% were utilized, in order to investigate the effect of pozzolanic materials on the corrosion of steel in concrete. Then cubic samples reinforced with steel bar spacing of 2.5, 5 and 7 cm from the cube surface were made and put in Caspian sea water for 5 months. During this period, corrosion potential of steel was measured by a calomel half cell (SCE). In order to finalize the evaluation of the mechanical strength of the samples, concrete pressure test was conducted and the result showed that after 40, 44 and 59 days for the bars with depth of 2.5, 5 and 7 cm, respectively and the samples prepared with water-cement ratio of 0.35, the corrosion potential was -350V versus SCE, while the compressive strength was approximately 450 kg/cm2. This result showed longer life span of this sample in comparison with other water-cement ratios. By adding micro silica to the samples up to 7.5%, the time for obtaining a corrosion potential of -350V, bars with depth of 2.5, 5 and 7 cm, was 43, 50 and 86 days, respectively, and the compressive strength of this sample was approximately 480 kg/cm2. Consequently, it is arguable that in order to achieve longer life span of corrosion and suitable compressive strength, the optimum ratio of water to cement should be 0.35 and the percentage of pozzolan SiO2 should be 7.5%.


Keywords    Chloride, Corrosion Potential, Steel Corrosion, Micro silica


چکیده    ﻋﻮاﻣﻞ زﯾﺎدي ﺑﺮ ﻣﯿﺰان ﻧﻔﻮذ ﯾﻮن ﮐﻠﺮ در ﺑﺘﻦ در محیط­های دریایی ﺗﺎﺛﯿﺮﮔﺬار ﻣﯽ ﺑﺎﺷﻨﺪ ﮐﻪ ﻫﻤﻪ آﻧﻬﺎ را ﻣﯽ ﺗﻮان در ﮐﯿﻔﯿﺖ ﺑﺘﻦ ﺧﻼﺻﻪ ﻧﻤﻮد. در اﯾﻦ ﺗﺤﻘﯿﻖ ﺗﺎﺛﯿﺮ ﻧﺴﺒﺖ آب ﺑﻪ ﺳﯿﻤﺎن ﺑﺎ ﺳﻪ ﻧﺴﺒﺖ 35/0، 40/0 و45/0 مورد ارزیابی قرار گرفت. همچنین ﺟﻬﺖ ﺑﺮرﺳﯽ ﺗﺎﺛﯿﺮاﺳﺘﻔﺎده ازﻣﻮاد ﭘﻮزوﻻﻧﯽ بر مقاومت به خوردگی فولاد در بتن، از ﻣﯿﮑﺮوﺳﯿﻠﯿﺲ با درصد های مختلف %5 ، 5/7 و10 استفاده شد. سپس ﻧﻤﻮﻧﻪ­ﻫﺎي مکعبی تقویت شده با میلگرد فولادی با فاصله­های cm5/2، 5 و 7 از سطح مکعب ﺳﺎﺧﺘﻪ شد و به مدت 5 ماه درآب دریای خزر قرار گرفتند. در ﻃﻮل اﯾﻦ ﻣﺪت ﭘﺘﺎﻧﺴﯿﻞ ﺧﻮردﮔﯽ ﻓﻮﻻدها اندازه­گیری شد. درنهایت به منظور بررسی استحکام مکانیکی نمونه­ها، تست فشار بتن صورت گرفت. ﻧﺘﺎﯾﺞ نشان داد نمونه­های تهیه شده با نسبت آب به سیمان 35/0 پس از 40، 44 و 59 روز به ترتیب برای میلگردهای با عمق cm5/2، 5 و 7 به پتانسیل V350- نسبت به الکترود کالومل اشباع (SCE) رسیدند که در مقایسه با نسبت­های دیگر آب به سیمان عمر طولانی­تری داشته و نیز استحکام فشاری آن حدودا برابر MPa 450 بود. با افزودن میکروسیلیس به نمونه­ها تا 5/7% زمان رسیدن به پتانسیل خوردگی V 350- میلگردهای با عمق cm5/2، 5 و 7 به ترتیب 43، 50 و 86 روز رسید و مقاومت فشاری این نمونه نیز حدود MPa 480 بود. در نتیجه می­توان استدلال نمود که نسبت بهینه آب به سیمان به منظور رسیدن به عمر طولانی­تر خوردگی و استحکام فشاری مناسب 35/0% و درصد پوزولان SiO2 برابر 5/7% می­باشد.


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