The Experts below are selected from a list of 138 Experts worldwide ranked by ideXlab platform
M P Bergmann - One of the best experts on this subject based on the ideXlab platform.
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Improving Tomorrow's Infrastructure: Extending the Life of Concrete Structures with Solid Stainless Steel Reinforcing Bar
2008Co-Authors: R E Schnell, M P BergmannAbstract:Stainless steel reinforcing has been used in numerous structures throughout North America, including the Progreso Port Authority Bridge, Yucatan, Mexico, in 1937; the Haynes Inlet Slough Bridge, North Bend, OR, USA, in 2002; the Belt Parkway Bridge over the Ocean Parkway, Brooklyn, NY, USA, in 2004; and Woodrow Wilson Memorial Bridge on the Capitol Beltway, Washington, DC, USA in 2006. Recent advances in Concrete technology have provided structural designers with materials which can easily last more than 100 years, and the life of many Concrete structures today is limited by the reinforcing. Improvements in the life of the reinforcing can translate directly into extended life of the structure. Current projections by several transportation agencies show that the use of solid stainless steel reinforcing bar in bridge decks will more than double the life of the bridge deck. While solid stainless steel reinforcing bar can increase the cost of the bridge deck by as much as 12% (compared to carbon steel reinforcing), the economic value of the longer life outweighs the initial higher cost. In most cases, the additional cost of solid stainless steel reinforcing bar represents less than 1.5% of the total cost of the structure. Most Concrete structures are designed with Minimum Concrete Cover over the reinforcing bar which is required to protect the reinforcing bar from corrosion. Where the reinforcing bar is completely resistant to corrosion, the Cover can be reduced, saving costs of Concrete and reducing the total weight of the structure. In some structures, design savings made possible by the use of solid stainless steel reinforcing bar will offset as much as 100% of the initial cost increase from using the stainless reinforcing.
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Improving Tomorrow's Infrastructure: Extending the Life of Concrete Structures With Solid Stainless Steel Reinforcing Bar
2007Co-Authors: R E Schnell, M P BergmannAbstract:Stainless steel reinforcement has been used in numerous structures throughout North America. Recent advances in Concrete technology have provided structural designers with materials that can easily last over 100 years, and the life of many Concrete structures today is limited by the reinforcing. Improvements in the life of the reinforcing can translate directly into extended service life of the structure. Current projections by several transportation agencies show that the use of solid stainless steel reinforcing bar in bridge decks will more than double the service life of the bridge deck. While solid stainless steel reinforcing bar can increase the cost of the bridge deck by as much as 12% (compared to carbon steel reinforcing), the economic value of the longer life outweighs the initial higher cost. Most Concrete structures are designed with Minimum Concrete Cover over the reinforcing bar, which is required to protect the reinforcing bar from corrosion. Where the reinforcing bar is completely resistant to corrosion, the Cover can be reduced, saving costs of Concrete and reducing the total weight of the structure. In some structures, design savings made possible by the use of solid stainless steel reinforcing bar will offset as much as 100% of the initial cost increase from using stainless reinforcing.
M Padilha - One of the best experts on this subject based on the ideXlab platform.
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durability of Concrete structures in marine atmosphere zones the use of chloride deposition rate on the wet candle as an environmental indicator
Cement & Concrete Composites, 2010Co-Authors: Gibson Meira, C Andrade, C Alonso, J C Borba, M PadilhaAbstract:Durability of Concrete structures under marine environments has been studied for a long time. This work was focused on marine atmosphere zone and studied the deposition of chlorides on wet candle devices and its relation with chlorides accumulated into Concrete. Concrete specimens with three different mixtures were exposed at places located at four different distances from the sea. Periodically, chloride profiles were obtained and analysed taking into account environmental data. Results of numerical extrapolations show that chloride deposition rate on the wet candle can be used as an environmental indicator, helping to preview the expectancy of service life of Concrete structures or suggesting Minimum Concrete Cover thicknesses for a required service life. Regarding the studied region, service life decreases between 30% and 60% were observed when changing chloride deposition from 120 mg/m2 day to 500 mg/m2 day, which shows that chloride deposition plays an important role as an environmental indicator on service-life analysis of Concrete structures in marine atmosphere zone.
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Durability of Concrete structures in marine atmosphere zones – The use of chloride deposition rate on the wet candle as an environmental indicator
Cement and Concrete Composites, 2010Co-Authors: Gibson Meira, C Andrade, C Alonso, J C Borba, M PadilhaAbstract:Durability of Concrete structures under marine environments has been studied for a long time. This work was focused on marine atmosphere zone and studied the deposition of chlorides on wet candle devices and its relation with chlorides accumulated into Concrete. Concrete specimens with three different mixtures were exposed at places located at four different distances from the sea. Periodically, chloride profiles were obtained and analysed taking into account environmental data. Results of numerical extrapolations show that chloride deposition rate on the wet candle can be used as an environmental indicator, helping to preview the expectancy of service life of Concrete structures or suggesting Minimum Concrete Cover thicknesses for a required service life. Regarding the studied region, service life decreases between 30% and 60% were observed when changing chloride deposition from 120 mg/m2 day to 500 mg/m2 day, which shows that chloride deposition plays an important role as an environmental indicator on service-life analysis of Concrete structures in marine atmosphere zone.
R E Schnell - One of the best experts on this subject based on the ideXlab platform.
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Improving Tomorrow's Infrastructure: Extending the Life of Concrete Structures with Solid Stainless Steel Reinforcing Bar
2008Co-Authors: R E Schnell, M P BergmannAbstract:Stainless steel reinforcing has been used in numerous structures throughout North America, including the Progreso Port Authority Bridge, Yucatan, Mexico, in 1937; the Haynes Inlet Slough Bridge, North Bend, OR, USA, in 2002; the Belt Parkway Bridge over the Ocean Parkway, Brooklyn, NY, USA, in 2004; and Woodrow Wilson Memorial Bridge on the Capitol Beltway, Washington, DC, USA in 2006. Recent advances in Concrete technology have provided structural designers with materials which can easily last more than 100 years, and the life of many Concrete structures today is limited by the reinforcing. Improvements in the life of the reinforcing can translate directly into extended life of the structure. Current projections by several transportation agencies show that the use of solid stainless steel reinforcing bar in bridge decks will more than double the life of the bridge deck. While solid stainless steel reinforcing bar can increase the cost of the bridge deck by as much as 12% (compared to carbon steel reinforcing), the economic value of the longer life outweighs the initial higher cost. In most cases, the additional cost of solid stainless steel reinforcing bar represents less than 1.5% of the total cost of the structure. Most Concrete structures are designed with Minimum Concrete Cover over the reinforcing bar which is required to protect the reinforcing bar from corrosion. Where the reinforcing bar is completely resistant to corrosion, the Cover can be reduced, saving costs of Concrete and reducing the total weight of the structure. In some structures, design savings made possible by the use of solid stainless steel reinforcing bar will offset as much as 100% of the initial cost increase from using the stainless reinforcing.
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Improving Tomorrow's Infrastructure: Extending the Life of Concrete Structures With Solid Stainless Steel Reinforcing Bar
2007Co-Authors: R E Schnell, M P BergmannAbstract:Stainless steel reinforcement has been used in numerous structures throughout North America. Recent advances in Concrete technology have provided structural designers with materials that can easily last over 100 years, and the life of many Concrete structures today is limited by the reinforcing. Improvements in the life of the reinforcing can translate directly into extended service life of the structure. Current projections by several transportation agencies show that the use of solid stainless steel reinforcing bar in bridge decks will more than double the service life of the bridge deck. While solid stainless steel reinforcing bar can increase the cost of the bridge deck by as much as 12% (compared to carbon steel reinforcing), the economic value of the longer life outweighs the initial higher cost. Most Concrete structures are designed with Minimum Concrete Cover over the reinforcing bar, which is required to protect the reinforcing bar from corrosion. Where the reinforcing bar is completely resistant to corrosion, the Cover can be reduced, saving costs of Concrete and reducing the total weight of the structure. In some structures, design savings made possible by the use of solid stainless steel reinforcing bar will offset as much as 100% of the initial cost increase from using stainless reinforcing.
Gibson Meira - One of the best experts on this subject based on the ideXlab platform.
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durability of Concrete structures in marine atmosphere zones the use of chloride deposition rate on the wet candle as an environmental indicator
Cement & Concrete Composites, 2010Co-Authors: Gibson Meira, C Andrade, C Alonso, J C Borba, M PadilhaAbstract:Durability of Concrete structures under marine environments has been studied for a long time. This work was focused on marine atmosphere zone and studied the deposition of chlorides on wet candle devices and its relation with chlorides accumulated into Concrete. Concrete specimens with three different mixtures were exposed at places located at four different distances from the sea. Periodically, chloride profiles were obtained and analysed taking into account environmental data. Results of numerical extrapolations show that chloride deposition rate on the wet candle can be used as an environmental indicator, helping to preview the expectancy of service life of Concrete structures or suggesting Minimum Concrete Cover thicknesses for a required service life. Regarding the studied region, service life decreases between 30% and 60% were observed when changing chloride deposition from 120 mg/m2 day to 500 mg/m2 day, which shows that chloride deposition plays an important role as an environmental indicator on service-life analysis of Concrete structures in marine atmosphere zone.
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Durability of Concrete structures in marine atmosphere zones – The use of chloride deposition rate on the wet candle as an environmental indicator
Cement and Concrete Composites, 2010Co-Authors: Gibson Meira, C Andrade, C Alonso, J C Borba, M PadilhaAbstract:Durability of Concrete structures under marine environments has been studied for a long time. This work was focused on marine atmosphere zone and studied the deposition of chlorides on wet candle devices and its relation with chlorides accumulated into Concrete. Concrete specimens with three different mixtures were exposed at places located at four different distances from the sea. Periodically, chloride profiles were obtained and analysed taking into account environmental data. Results of numerical extrapolations show that chloride deposition rate on the wet candle can be used as an environmental indicator, helping to preview the expectancy of service life of Concrete structures or suggesting Minimum Concrete Cover thicknesses for a required service life. Regarding the studied region, service life decreases between 30% and 60% were observed when changing chloride deposition from 120 mg/m2 day to 500 mg/m2 day, which shows that chloride deposition plays an important role as an environmental indicator on service-life analysis of Concrete structures in marine atmosphere zone.
Chandrasekhar Bhojaraju - One of the best experts on this subject based on the ideXlab platform.
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A critical review of the effect of Concrete composition on rebar–Concrete interface (RCI) bond strength: A case study of nanoparticles
SN Applied Sciences, 2020Co-Authors: Seyed Sina Mousavi, Seyed Soheil Mousavi Ajarostaghi, Chandrasekhar BhojarajuAbstract:Minimum Concrete Cover for rebar, rebar diameter, Concrete compressive strength, embedded length of rebar, and lateral reinforcement by stirrups are the crucial factors considered in existing predicting equations and regulations for predicting rebar–Concrete interface (RCI) bond strength. However, considerable effects of Concrete composition on RCI are ignored in design codes and investigations. This paper intends to comprehensively highlight the critical aspects of this research gap. Additionally, a practical experimental approach is described in the present study to efficiently consider the effect of the new generations of Concrete on RCI bond strength. Finally, nano-Concrete is considered as a case study to show the importance of nanoparticle types on RCI bond strength. Overall results show that studying the microstructure of the transition zone at RCI is essential to accompany with the RCI bond strength for considering new generations of Concrete in reinforced Concrete structures. Additionally, the current study emphasizes that more investigations are necessary to be conducted by future works to fill the existing research gaps in RCI.
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A critical review of the effect of Concrete composition on rebar–Concrete interface (RCI) bond strength: A case study of nanoparticles
SN Applied Sciences, 2020Co-Authors: Seyed Sina Mousavi, Seyed Soheil Mousavi Ajarostaghi, Chandrasekhar BhojarajuAbstract:Minimum Concrete Cover for rebar, rebar diameter, Concrete compressive strength, embedded length of rebar, and lateral reinforcement by stirrups are the crucial factors considered in existing predicting equations and regulations for predicting rebar–Concrete interface (RCI) bond strength. However, considerable effects of Concrete composition on RCI are ignored in design codes and investigations. This paper intends to comprehensively highlight the critical aspects of this research gap. Additionally, a practical experimental approach is described in the present study to efficiently consider the effect of the new generations of Concrete on RCI bond strength. Finally, nano-Concrete is considered as a case study to show the importance of nanoparticle types on RCI bond strength. Overall results show that studying the microstructure of the transition zone at RCI is essential to accompany with the RCI bond strength for considering new generations of Concrete in reinforced Concrete structures. Additionally, the current study emphasizes that more investigations are necessary to be conducted by future works to fill the existing research gaps in RCI.