scholarly journals Modern Methods of Diaphragm Walls Design

2021 ◽  
Vol 13 (24) ◽  
pp. 14004
Author(s):  
Mateusz Frydrych ◽  
Grzegorz Kacprzak ◽  
Paweł Nowak
Keyword(s):  
Geotechnical Engineering ◽  
Concrete Structures ◽  
Steel Reinforcement ◽  
Bridge Engineering ◽  
Sustainable Construction ◽  
Engineering Science ◽  
Hazard Reduction ◽  
Modern Methods ◽  
Diaphragm Walls ◽  
Innovative Concept

This article addresses hazard reduction in deep excavations. The authors present a possible combination of prestressing of concrete structures (from bridge engineering) and prestressed structures of diaphragm walls from geotechnical engineering science. This innovative concept has not yet been shown in scientific articles. The “Sofistik” software (with TENDON module–SYSP/AXES/TOPP/TGEO) and its use is shown, with graphical presentations of the suggested solution. The authors compare the provided solution through usage of Sofistik and Plaxis software. The results show possible strengthening of sustainable construction by limitation of hazards and decreasing costs (via limitation of use of expensive steel reinforcement).

scholarly journals Examples of Solutions for Steel-Concrete Composite Structures in Bridge Engineering / Przykłady Konstrukcji Zespolonych W Budownictwie Mostowym

2015 ◽  
Vol 16 (1) ◽  
pp. 51-68
Author(s):  
Kazimierz Flaga ◽  
Kazimierz Furtak
Keyword(s):  
Structural Design ◽  
Composite Structures ◽  
Concrete Structures ◽  
Design Analysis ◽  
Bridge Engineering ◽  
Structural Composition ◽  
Points Of View

Abstract The aim of the article [1] was to discuss the application of steel-concrete composite structures in bridge engineering in the aspect of structural design, analysis and execution. It was pointed out that the concept of steel-concrete structural composition is far from exhausted and new solutions interesting from the engineering, scientific and aesthetic points of view of are constantly emerging. These latest trends are presented against the background of the solutions executed in Poland and abroad. Particular attention is focused on structures of double composition and steel-concrete structures. Concrete filled steel tubular (CFST) structures are highlighted.

Is GFRP Rebar a Potential Replacement for Steel Reinforcement in Concrete Structures?

2015 ◽  
pp. 2043-2056
Author(s):  
P. Gandhi ◽  
D. M. Pukazhendhi ◽  
S. Vishnuvardhan ◽  
M. Saravanan ◽  
G. Raghava
Keyword(s):  
Concrete Structures ◽  
Steel Reinforcement

Prestressing Steel Ropes - Corrosion Impact on its Properties

2020 ◽  
Vol 309 ◽  
pp. 272-280
Author(s):  
Jiří Kolísko ◽  
Vítězslav Vacek ◽  
Petr Pokorný ◽  
Michaela Kostelecká
Keyword(s):  
Maraging Steel ◽  
Prestressed Concrete ◽  
Mechanical Characteristics ◽  
Concrete Structures ◽  
Steel Reinforcement ◽  
Prestressing Steel ◽  
Anticorrosion Protection ◽  
Long Time ◽  
Prestressed Reinforcement ◽  
Prestressed Structures

Steel reinforcement made of refined maraging steel in the form of wires and tendons has been for a long time used commonly for reinforcement of prestressed concrete structures. Defects on some of them and unfortunately even accidents of some cases of bridge objects, mainly recently published by media, related to corrosion of prestressed reinforcement awoke interest of both professional and wide non-professional public related to its durability. This issue also opens up a question of durability and liability of prestressed structures. In majority of existing prestressed structures the anticorrosion protection of reinforcement was traditionally secured mainly by alkalinity of the environment, i.e. concreting and/or grouting of prestressed elements in ducts. The abstract presents information related mainly to mechanical characteristics of corrosion-affected prestressed elements.

Steel Reinforcement Corrosion - Its Impact on Features of Steel PSC Strand

2020 ◽  
Vol 868 ◽  
pp. 57-64
Author(s):  
Vítězslav Vacek ◽  
Jiří Kolisko ◽  
Petr Pokorný ◽  
Michaela Kostelecká
Keyword(s):  
Maraging Steel ◽  
Prestressed Concrete ◽  
Mechanical Characteristics ◽  
Concrete Structures ◽  
Steel Reinforcement ◽  
Reinforcement Corrosion ◽  
Anticorrosion Protection ◽  
Long Time ◽  
Prestressed Reinforcement ◽  
Prestressed Structures

Steel reinforcement made of refined maraging steel in the form of wires and strands has been for a long time used commonly for reinforcement of prestressed concrete structures. Defects on some of them and unfortunately even accidents of some cases of bridge objects, mainly recently published by media, related to corrosion of prestressed reinforcement awoke interest of both professional and wide non-professional public related to its durability. This issue also opens up a question of durability and liability of prestressed structures. In majority of existing prestressed structures the anticorrosion protection of reinforcement was traditionally secured mainly by alkalinity of the environment, i.e. concreting and/or grouting of prestressed elements in ducts. The abstract presents information related mainly to mechanical characteristics of corrosion-affected prestressed elements.

scholarly journals Corrosion Prevention on Coated Rebars and Fiber in R.C Slabs

2018 ◽  
Vol 7 (3.34) ◽  
pp. 36
Author(s):  
Dr M.Tamil Selvi ◽  
Ms. J Hathari Evangalin ◽  
M.s S. Gayathri
Keyword(s):  
Research Work ◽  
Concrete Structures ◽  
Steel Reinforcement ◽  
Accelerated Corrosion ◽  
Structural Problems ◽  
Nylon Fiber ◽  
Cell Measurement ◽  
Accelerated Corrosion Test ◽  
Rc Slabs ◽  
Corrosion Of Steel

Concrete structures prevail primarily due to prior attrition of steel due to preterm failure of rebars. The major cause of deterioration is the corrosion of the steel reinforcement, that can lead to structural problems. By utilizing our knowledge on corrosion of steel reinforcement, concrete structures could be made more durable. The research work is intend at arrestcorrosion in RC slabs by glazing silicon tombac to the steel rods. Nylon fiber is induced in concrete to attain strength for the concrete. A study report carried the effects of coating material between the conventional and fibers in concrete was compared with that of uncoated material between the conventional and fiber in concrete rebar’s. A continuous corrosion process is accelerated by inducing direct current to rebars. Process used to prompt corrosion is Accelerated corrosion test and Half-cell measurement.  

scholarly journals Evaluation of the Bond-to-Concrete Properties of GFRP Rebars in Marine Environments

2018 ◽  
Vol 3 (4) ◽  
pp. 44 ◽  
Author(s):  
Alvaro Ruiz Emparanza ◽  
Francisco De Caso Y Basalo ◽  
Raphael Kampmann ◽  
Itziar Adarraga Usabiaga
Keyword(s):  
Bond Strength ◽  
Concrete Structures ◽  
Steel Reinforcement ◽  
Fiber Reinforced Polymer ◽  
Multiple Time ◽  
Bond Performance ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Different Temperatures ◽  
Corrosion Of Steel

Increased traffic in combination with growing environmental impacts have led to the accelerated degradation of built infrastructure. In reinforced concrete structures, the corrosion of steel reinforcement is the predominant cause of deterioration. Thus, over the last years the use of glass fiber reinforced polymer (GFRP) composites as internal reinforcement bars (rebars) for concrete structures has been evaluated, and has been proved to be a viable alternative to traditional steel reinforcement mainly due to its tensile strength and non-corrosive nature. However, thus far, the GFRP rebar market is diverse and manufacturers around the world produce GFRP rebar types with different surface enhancements to improve the bond to concrete characteristics. In this study, the bond performance of three dissimilar GFRP rebar types (sand coated, helically grooved and with surface lugs) was evaluated over time in seawater environments, with a focus on the bond strength. Accordingly, specimens were exposed to seawater in circulating chambers at three different temperatures (23 °C, 40 °C and 60 °C) for multiple time periods (60 and 120 days). To evaluate the bond performance, pullout tests were conducted according to ASTM D7913. The results showed that the bond strength varied with the surface enhancement features. However, the bond strength did not vary significantly with exposure time and temperature for all three evaluated rebar types.

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