Comparison of Chloride-Induced Corrosion of Microsilica and ECC in the Offshore Piers' Concrete (Case Study: Wharves P3 & P4 of Imam Khomeini Petrochemical)
Abdolreza Tangtakabi,
Mohammad Hasan Ramesht,
Ali Golsoorat Pahlaviani
Issue:
Volume 6, Issue 4, August 2021
Pages:
66-73
Received:
4 June 2021
Accepted:
8 July 2021
Published:
2 August 2021
Abstract: The corrosion of reinforcements in the tidal zone leads to significant damage to offshore concrete piers. To overcome such damages, the quality of concrete and its mechanical properties should be improved. The aim of the present study is to identify and evaluate the causes and extent of corrosion observed in piers P3 & P4 in Imam Khomeini petrochemical. The concrete reinforced by microsilica and the ECC concrete are used to prevent corrosion. Some tests were conducted to determine the conditions of concrete piers in terms of reinforcement corrosion. Then, a reinforcement corrosion intensity test using Potentiostat involving a placement process was used, where the water-to-cement ratio was 38%; superplasticizers was 4%; and microsilica was 10% and 15%. The microsilica can serve as an alternative to the consumed cement and was measured according to the ASTM standards; Besides, it was exposed to aggressive conditions at different periods, and a concrete compressive strength test was performed. The results show that the compressive strength of concrete with microsilica 15% is nearly 25% higher than that of ECC, while for the control specimen, this value is about 42%. Regarding the corrosion intensity, the concrete with microsilica 15% has the minimum value compare to all three other samples. It is recommended to use this type of concrete to overcome the corrosion problem in piers P3 & P4 in Imam Khomeini petrochemical.
Abstract: The corrosion of reinforcements in the tidal zone leads to significant damage to offshore concrete piers. To overcome such damages, the quality of concrete and its mechanical properties should be improved. The aim of the present study is to identify and evaluate the causes and extent of corrosion observed in piers P3 & P4 in Imam Khomeini petrochem...
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Basic Analysis of a Steel Structure for Extreme Wind Loads
Mohammed Faruqi,
Ateeq Mohammed Abdul,
Francisco Aguiniga,
Breanna Bailey
Issue:
Volume 6, Issue 4, August 2021
Pages:
74-81
Received:
15 August 2021
Accepted:
30 August 2021
Published:
6 September 2021
Abstract: In recent years, there has been an increase in United States (US) population and hence subsequently the increase in construction. Hurricanes are natural disaster and have a high probability rate of impact in the US. This is because the US has an extensive shoreline. Accordingly, US has experienced a number of hurricanes and its after effects are still evident. Therefore, there is a need to study these hurricanes and produce a better hurricane resistant design. In this basic work, we used hurricane intensity loads to study the effect of a hurricane on a typical shopping mall located in South Texas region using RISA-3D (Rapid Interactive Structural Analysis – 3 Dimensions) software along with the combination of design specifications from American Society of Civil Engineers (ASCE) and American Institute of Steel Construction-Load-Resistance and Factor Design (AISC-LRFD). The design factors for the calculation of the wind pressure were obtained from the ASCE manual and the members were selected from AISC-LRFD. A total of six loading cases were studied in this project namely: uniformly distributed and concentrated loads with no brace, two braces and four brace combinations. It was found that member M1 with no brace and four braces respectively produced the largest and smallest moments and member M4 with no brace and four braces respectively produced the highest and lowest deflections. The results from the basic analysis showed that we need to address controlling moments and deflections in critical members for a better hurricane resistant design.
Abstract: In recent years, there has been an increase in United States (US) population and hence subsequently the increase in construction. Hurricanes are natural disaster and have a high probability rate of impact in the US. This is because the US has an extensive shoreline. Accordingly, US has experienced a number of hurricanes and its after effects are st...
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