Mechanical Properties of Concrete and Steel Reinforcement

2015 ◽  
pp. 21-58 ◽  
Author(s):  
Xianglin Gu ◽  
Xianyu Jin ◽  
Yong Zhou
Keyword(s):  
Mechanical Properties ◽  
Steel Reinforcement

3D-printed steel reinforcement for digital concrete construction – Manufacture, mechanical properties and bond behaviour

2018 ◽  
Vol 179 ◽  
pp. 125-137 ◽  
Author(s):  
Viktor Mechtcherine ◽  
Jasmin Grafe ◽  
Venkatesh N. Nerella ◽  
Erik Spaniol ◽  
Martin Hertel ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Steel Reinforcement ◽  
Concrete Construction ◽  
Bond Behaviour ◽  
3D Printed

Determination of Some Mechanical Properties of Welded Reinforcing Steel with Self-Shielded Wires by Vibration Tests

2014 ◽  
Vol 1029 ◽  
pp. 206-211 ◽  
Author(s):  
Liviu Bereteu ◽  
Mircea Burcă ◽  
Raul Moisa ◽  
Dorin Simoiu ◽  
Gheorghe Drăgănescu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Welding Process ◽  
Steel Reinforcement ◽  
Reinforcing Steel ◽  
Coated Electrode ◽  
Major Disadvantage ◽  
Steel Bars ◽  
Vibration Tests ◽  
The Cost

Reinforced concrete is a material formed by pouring concrete over reinforcement steel bars and wires and sometimes by a polymer that turns by drying in a hard and rigid composite. Welding of steel reinforcement concrete is a relatively difficult operation and with a large amount of work, given by the large number of welds that are needed and when this work is make in site conditions. The most common method of steel reinforcement welding is manual welding with coated electrode. The major disadvantage of this process is low productivity in welding effects on execution time, and the cost of welding. An alternative to manual welding with coated electrode for steel reinforcement welding on site is the welding process with self-shielded tubular wires.The aim of this paper is to determine the mechanical properties of welded reinforcing steel PC 52 with self-shielded wires, using a vibroacustic technique. To validate this method, the results obtained by vibroacoustic signal processing are compared with those determined by the tensile stresses of the same samples.

Improvement of Quality of Concrete and Reducing Corrosion of Steel Reinforcement by Using Polypropylene Fibers, Styrene-Butadiene Rubber, and Integral Waterproofing Admixture

2021 ◽  
Vol 895 ◽  
pp. 68-76
Author(s):  
Nibras Ali Alsahaf ◽  
Asaad Mohammed Al Gharaawyi ◽  
Layth Abdul Rasool Al Asadi ◽  
Qusay A. Jabal ◽  
Mohammed Abbas Al-Jumaili
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Steel Reinforcement ◽  
Styrene Butadiene Rubber ◽  
Polymer Concrete ◽  
Polypropylene Fibers ◽  
Butadiene Rubber ◽  
Corrosion Of Steel ◽  
Styrene Butadiene

Reinforced concrete foundation, rigid pavements, and other structural members with attachment with ground or salty water like piers or retaining walls and others, subjected to chloride and sulfate salts attacks and that leads to damaging the structures or at least reduce durability, some concrete admixtures like waterproofing admixtures or polymers reduce permeability and increase mechanical properties and also durability. This research aims to improve the quality of concrete and reducing corrosion of steel reinforcement by using integral waterproofing admixture, styrene-butadiene rubber (SBR) and polypropylene fibers. mechanical properties such as compressive, flexural strength highly improved in this study. The reduction of weight of steel reinforcement by subjecting reinforced concrete specimens to chloride water (6% concentration) was 2.61 % for ordinary reinforced concrete and by using waterproof –polymer concrete with poly fibers, the reduction was less and its value was 0.93% and that was for 6 months’ exposure, and for 1-year exposure, the reduction in steel reinforcement weight was 4.72% for ordinary concrete and 1.4% for waterproof concrete.

Long-Term Mechanical Properties of Fiber Reinforced Polymer Bars Exposed to Alkali Environment: Experimental Investigation

2016 ◽  
Vol 722 ◽  
pp. 27-32
Author(s):  
František Girgle ◽  
Lenka Bodnárová ◽  
Anna Matusikova ◽  
Vojtěch Kostiha ◽  
Jan Prokeš ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Concrete Structures ◽  
Steel Reinforcement ◽  
Advanced Composite Materials ◽  
Long Time ◽  
Frp Reinforcement ◽  
High Alkali ◽  
The Impact ◽  
Whole Life Cycle

This paper deals with actual issues concerning the design and the utilization of modern composite reinforcement (FRP) in concrete structures. These advanced composite materials are, especially if the whole life cycle of the structure is considered, gradually becoming a convenient alternative to ordinary steel reinforcement. The structure reinforced with FRP reinforcement (as well as the structure reinforced with steel reinforcement) has to be designed with regard to sufficient endurance, serviceability and durability. The long-term material properties of FRP reinforcement embedded in concrete, which are influenced by temperature, load magnitude and ambient environment, must be considered during design of the structure. A high alkali environment of concrete with pH higher than 12.0 acts mainly on glass fibres which degrade and their mechanical properties are reduced consequently. The used matrix creates a barrier which insulates the bearing fibres against alkali ions attack. The main objective of the paper is therefore to describe behaviour of composite as a whole. The experimental approach and results which were reached during the tests are also presented. An effort was to specify the impact of alkali environment on the long-time properties of developed reinforcement which could be used in durable concrete structures.

Influence of chloride corrosion on the effective mechanical properties of steel reinforcement

2019 ◽  
Vol 15 (8) ◽  
pp. 1036-1048 ◽  
Author(s):  
Kaveh Andisheh ◽  
Allan Scott ◽  
Alessandro Palermo ◽  
Don Clucas
Keyword(s):  
Mechanical Properties ◽  
Steel Reinforcement ◽  
Chloride Corrosion ◽  
Effective Mechanical Properties

scholarly journals Experimental Study on Bond Stress between Ultra High Performance Concrete and Steel Reinforcement

2018 ◽  
Vol 3 (12) ◽  
pp. 1235 ◽  
Author(s):  
Ahad Amini Pishro ◽  
Xiong Feng
Keyword(s):  
Mechanical Properties ◽  
Shear Stress ◽  
High Performance ◽  
High Performance Concrete ◽  
Longitudinal Shear ◽  
Steel Reinforcement ◽  
Bond Stress ◽  
Axial Deformation ◽  
Ultra High Performance Concrete ◽  
Cement Based Materials

Due to axial deformations generally caused by flexure, shear stress will be generated across the interface between reinforcement and surrounding concrete. This longitudinal shear stress is called bond stress and coordinates deformation between concrete and reinforcement. With increasing a member's axial deformation, bond stress finally reaches its ultimate value, bond strength, after which deformation of reinforcement and surrounding concrete will be not coordinated any more. Studies have shown that addition of nanosilica into cement-based materials improves their mechanical properties. Considering the unique characteristics of nanosilica, it seems that this material can be used in ultra-high performance concrete. Therefore, further research is needed on how to use it in concrete mixes. Due to the importance of examining bond stress and the lack of exact equations for bond stress of ultra-high performance concrete and steel reinforcement, the present study aimed to assess the bond stress between concrete and steel reinforcement.

scholarly journals THE INFLUENCE OF MICROSTRUCTURAL FACTORS AND HEAT TREATMENT ON THE CORROSION RESISTANCE OF REINFORCING STEEL CLASS A 600

2018 ◽  
Vol 22 (2) ◽  
pp. 52-63 ◽  
Author(s):  
N. N. Sergeev ◽  
V. V. Izvol'skiy ◽  
A. N. Sergeev ◽  
S. N. Kutepov ◽  
A. E. Gvozdev ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Corrosion Resistance ◽  
Chemical Composition ◽  
Carbon Content ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Steel Reinforcement ◽  
Reinforcing Steel

Currently, hot rolled bar reinforcement class A600 of low-alloy steels in the delivery condition has a high tendency to this very specific kind of destruction as stress corrosion cracking under tension (SCC). However, there are cases of collapse of pre-stressed concrete structures, in most cases initiated corrosion cracking under stress, put the problem this type of fracture is particularly acute. In stress corrosion cracking cracks occur, the occurrence of which depends not only on the structural state of the material, the type and level of stress, but also on the degree of aggressiveness of the environment in which the operation occurs. In this regard, it is very important to establish how the corrosion resistance of class A600 reinforcing steel varies depending on the change in the chemical composition, microstructure, the level of applied and residual micro-stresses, and various modes of heat treatment. The purpose of this paper is to study the effect of the above factors on the resistance of low-alloyed reinforcing steel class A600 stress corrosion cracking It is shown that the sensitivity of the reinforcement to stress corrosion cracking is largely determined by the chemical composition (mainly carbon content), the type of microstructure and the level of residual micro-stresses. The influence of heat treatment regimes on the corrosion resistance of A600-grade reinforcing steel in nitrates solutions is investigated. It is shown that the use of additional heat treatment (normalization and improvement) increases the corrosion resistance of steel. High corrosion resistance steel reinforcement has only a carbon content at the lower limit of the vintage composition, which is provided by the structure of homogeneous bainite with mechanical properties at the level of strength class A600. With higher mechanical properties, the steel reinforcement has lower corrosion resistance.

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