Influence of Synthetic Fibers Dispersed Reinforced Concrete

2015 ◽  
Vol 725-726 ◽  
pp. 543-558 ◽  
Author(s):  
Yuri Barabanshchikov ◽  
Arman Turkebayev ◽  
Azamat Dalabayev ◽  
Daniyar Tleukhanov
Keyword(s):  
Composite Material ◽  
Reinforced Concrete ◽  
Concrete Strength ◽  
Fiber Reinforcement ◽  
Concrete Aggregate ◽  
Cement Concrete ◽  
Synthetic Fibers ◽  
Strength Concrete ◽  
Concrete Mix

Nowadays, construction often is used a composite material. Including fibro concrete of reinforcing synthetic fibers. In this title was survey the effect of fiber reinforcement. PAN and HC on the properties of concrete in depend of length fibers, its design, types dressing, composition of concrete, aggregate fineness and etc. As a result of influence was revealed that is not depend of length fibers in the same mobility of concrete mix and differente flow consumption of cement concrete strength in compressive decreases and increases a concrete of fiber. The same conditions strength concrete in flexural with increases content fibro rising. In attendance fibro model is deformation decreases but maximum permission increase.

Specimen Size and Shape Effects on the Concrete Properties, Thermal Conductivity and Heat Generation from Hydration for Different Concrete Types

2019 ◽  
Vol 16 (10) ◽  
pp. 4072-4091 ◽  
Author(s):  
Ola Adel Qasim
Keyword(s):  
Thermal Conductivity ◽  
Reinforced Concrete ◽  
Heat Generation ◽  
High Strength Concrete ◽  
Concrete Beam ◽  
Concrete Strength ◽  
High Strength ◽  
Strength Concrete ◽  
Concrete Properties ◽  
The Difference

The environmental impact, manufacture and the application of concrete have many influences, some of which are influential and complex. Construction engineers are looking for modern ideas and methods that make the building more efficient in terms of functionality, cost, high strength, reduced overloads and increased efficiency of unlimited geometric shapes. The main factor in the improvement and development of concrete structures rely on the engineering characteristics of the substances. The developments in the construction materials, mix proportions, dimensions, mixing, and conditions (temperature) used to enhance the concrete technology, have important impacts on characteristics of concrete strength and heat development manner. The heat generation from concrete reveals the components of concrete materials and mix balances as well as the innovations in structure and environmental circumstances. This research presented an experimental investigation of the significance of the specimen’s shape and the size of the concrete properties durability, thermal conductivity and heat generation. Cylinders, prisms, and cubes of different sizes and shapes will be used. This research concluded that the effect of molds shape and size decreased when the (strength in compression, splitting tensile strength, flexural strength, and concrete density) increasing, that’s mean for ultra-high-strength concrete the difference is much smaller. The concrete hydration due to heat increases with increasing of the concrete strength and size, and the difference in heat transfer with the increasing of specimen’s size decreasing with increasing of concrete size. It is completely identified that the deformation and intensity of reinforced concrete beams depend on the size of the beam. Effect of concrete types (normal 26 MPa, high 46 MPa, and ultra-high-strength concrete 61 MPa) on the design of reinforced concrete beam was studied with three different depth (170, 155 and 150 mm). Results revealed that high strength and ultra-high-strength concrete was able to substitute for the reduction in beams size with the same strength. For concrete that is high or ultra-high-strength a reduction in the beam depth of about (8.82%) and (11.76%) compared to the normal concrete beam where achieved.

scholarly journals Analytical modeling of glass composite and metal reinforcement adhesion with cements and concrete

2019 ◽  
Vol 110 ◽  
pp. 01046
Author(s):  
Victor Yartsev ◽  
Botir Giyasov ◽  
Alexey Nikolyukin ◽  
Abdul Barei Danish ◽  
Timur Giyasov ◽  
...  
Keyword(s):  
Composite Material ◽  
Reinforced Concrete ◽  
Contact Surface ◽  
Software Package ◽  
Damage Accumulation ◽  
Analytical Modeling ◽  
Glass Composite ◽  
Cement Concrete ◽  
Concrete Mass ◽  
Distribution Of Stresses

Adhesion refers to the ability of concrete to resist slipping of reinforcement under loading in reinforced concrete products. The term "reinforced concrete" is considered as a uniform composite material as long as there is adhesion on the contact surface between the reinforcement and the concrete. In case of disruption of the reinforcement and concrete interaction, the construction is represented by separate elements. The aim of this work is to simulate the process of glass composite and metal reinforcement adhesion with cement concrete. To solve this problem, analytical modeling was performed in the ANSYS 19.0 Workbench software package, with the help of which the nature of damage accumulation in the rebar and the distribution of stresses in the concrete mass are determined.

scholarly journals Prediction of Corner Columns’ Load Capacity Using Composite Material Analogy

2018 ◽  
Vol 8 (2) ◽  
pp. 2745-2749
Author(s):  
A. Ali ◽  
Z. Soomro ◽  
S. Iqbal ◽  
N. Bhatti ◽  
A. F. Abro
Keyword(s):  
Composite Material ◽  
Load Capacity ◽  
Construction Material ◽  
Concrete Strength ◽  
Axial Loading ◽  
High Strength ◽  
Strength Concrete ◽  
Different Types ◽  
Normal Strength ◽  
The One

There are numerous reasons for which concrete has become the most widely used construction material in buildings, one of them being its availability in different types, such as fiber-reinforced, lightweight, high strength, conventional and self-compacting concrete. This advantage is specially realized in high-rise building construction, where common construction practice is to use concretes of different types or strength classes in slabs and columns. Columns in such structures are generally made from concrete which is higher in compressive strength than the one used in floors or slabs. This raises issue of selection of concrete strength that should be used for estimating column capacity. Current paper tries to address this issue by testing nine (09) sandwich column specimens under axial loading. The floor concrete portion of the sandwich column was made of normal strength concrete, whereas column portions from comparatively higher strength concrete. Test results show that aspect ratio (h/b) influences the effective concrete strength of such columns. A previously adopted methodology of composite material analogy with some modifications has been found to predict well the capacity of columns where variation in floor and concrete strength is significant.

Minimum flexural reinforcement for T-beams made of higher strength concrete

1999 ◽  
Vol 26 (5) ◽  
pp. 525-534 ◽  
Author(s):  
Guney Ozcebe ◽  
Ugur Ersoy ◽  
Tugrul Tankut
Keyword(s):  
Reinforced Concrete ◽  
Concrete Strength ◽  
High Strength ◽  
Reinforced Concrete Beams ◽  
Crack Control ◽  
Minimum Reinforcement ◽  
Strength Concrete ◽  
The Past ◽  
Flexural Reinforcement ◽  
Reserve Strength

Design codes specify minimum flexural reinforcement for reinforced concrete beams. With the extensive use of higher strength concrete, the empirical expressions of the past for minimum flexural reinforcement, in which the concrete strength is not considered, had to be revised. Six reinforced concrete T-beams, having small ratios of flexural reinforcement, were tested to study the behaviour at the positive moment region and to evaluate the code requirements on minimum flexural reinforcement. A criterion was set and evaluations of different minimum reinforcement requirements were made using this criterion and the test data.Key words: beams, crack control, ductility, flexural strength, high strength concrete, minimum flexural reinforcement, reserve strength.

scholarly journals Experimental investigations of reinforced concrete columns in the edge connection zone with a reinforced concrete slab

2014 ◽  
Vol 13 (3) ◽  
pp. 175-182
Author(s):  
Tadeusz Urban ◽  
Michał Gołdyn ◽  
Łukasz Krawczyk
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Concrete Strength ◽  
Variable Parameter ◽  
High Strength ◽  
Concrete Columns ◽  
Experimental Investigations ◽  
Reinforced Concrete Slab ◽  
Strength Concrete ◽  
High Strength Concrete Columns

In this paper the results of the experimental investigations of edge column – slab connections are presented and commented on. The load transmission mechanism between high strength concrete columns and slab made of normal, five times lower strength concrete was considered. The variable parameter of presented study was the overhang of slab cantilever. The performed study showed important effect of slab cantilever on effective concrete strength of column in the connection zone.

scholarly journals Mechanical Properties and Design of Concrete with Hybrid Steel and Basalt Fiber

2021 ◽  
Vol 264 ◽  
pp. 02030
Author(s):  
Leonid Dvorkin ◽  
Oleh Bordiuzhenko ◽  
Vadim Zhitkovsky ◽  
Svyatoslav Gomon ◽  
Sviatoslav Homon
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Concrete Strength ◽  
Basalt Fiber ◽  
Fiber Reinforcement ◽  
Fiber Reinforced Concrete ◽  
Fiber Types ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Fine Grained

Adding different fiber types may yield improvement of steel fiber reinforced concrete (SFRC) features. Therefore, the investigation of hybrid fiber reinforced concrete (HFRC) mechanical properties is relevant. The effect of adding hybrid steel and basalt fiber on the mechanical properties of fine-grained concrete is studied. It is shown that hybrid fiber reinforcement using optimal steel and basalt fiber ratio allows preventing concrete mixtures' segregation and improving their structure homogeneity. This, in turn, allows achieving higher concrete strength values. In most cases, the design of such concrete compositions is based on engineering experience that limits the designers' capabilities. Therefore, an effective methodology for proper HFRC composition design should be developed. The present study is focused on developing such a methodology. The developed methodology includes using the mathematical experiments planning method to design optimal composition of high-strength fine-grained fiber reinforced concrete with hybrid steel and basalt fiber reinforcement. It is demonstrated that the proposed method can be effectively used for the design of optimal compositions of HFRC.

A New Calculation Method for Cracking Width of Beam with High Strength Rebar

2011 ◽  
Vol 243-249 ◽  
pp. 415-418
Author(s):  
Chun Min Dong ◽  
Ke Dong Guo ◽  
Jia Jia Sun
Keyword(s):  
Reinforced Concrete ◽  
Calculation Method ◽  
High Strength Concrete ◽  
Concrete Beam ◽  
Concrete Strength ◽  
High Strength ◽  
Reinforced Concrete Beam ◽  
Simply Supported ◽  
Strength Concrete

With the application of high strength concrete and rebar, the influence of concrete strength on cracking width of reinforced concrete beam with high strength rebar is becoming more and more important. To investigate the effect of concrete strength on cracking width of reinforced concrete beam with high strength rebar, the experiment including 6 simply supported T-beams with high-strength rebar and 2 beams with ordinary-strength rebar have been made. Then the relevant specifications advised in Code for Design of Concreter Structure (GB50010-2002) are revised according to the experiment results so as to considering the influence of concrete on cracking width. A new cracking width method considering the influence of concrete strength on cracking width for reinforced concrete beam with high strength rebar is proposed. Finally, the comparisons between predictions and experiment results have been conducted, which shown that the proposed new cracking width method agreed with experiment results well.

Critical shear crack theory-based punching shear model for FRP-reinforced concrete slabs

2020 ◽  
pp. 136943322097814
Author(s):  
Xing-lang Fan ◽  
Sheng-jie Gu ◽  
Xi Wu ◽  
Jia-fei Jiang
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Shear Crack ◽  
Concrete Strength ◽  
Weight Ratio ◽  
Punching Shear ◽  
Concrete Slabs ◽  
Crack Theory ◽  
Reinforced Concrete Slabs ◽  
Rc Slabs

Owing to their high strength-to-weight ratio, superior corrosion resistance, and convenience in manufacture, fiber-reinforced polymer (FRP) bars can be used as a good alternative to steel bars to solve the durability issue in reinforced concrete (RC) structures, especially for seawater sea-sand concrete. In this paper, a theoretical model for predicting the punching shear strength of FRP-RC slabs is developed. In this model, the punching shear strength is determined by the intersection of capacity and demanding curve of FRP-RC slabs. The capacity curve is employed based on critical shear crack theory, while the demand curve is derived with the help of a simplified tri-linear moment-curvature relationship. After the validity of the proposed model is verified with experimental data collected from the literature, the effects of concrete strength, loading area, FRP reinforcement ratio, and effective depth of concrete slabs are evaluated quantitatively.

scholarly journals Experimental Study on the Torsional Behaviour of Prestressed HSC Hollow Beams

2020 ◽  
Vol 10 (2) ◽  
pp. 642 ◽  
Author(s):  
Luís Bernardo ◽  
Sérgio Lopes ◽  
Mafalda Teixeira
Keyword(s):  
Experimental Study ◽  
High Strength Concrete ◽  
Concrete Beams ◽  
Concrete Strength ◽  
High Strength ◽  
Experimental Program ◽  
Pure Torsion ◽  
Strength Concrete ◽  
Hollow Beams

This article describes an experimental program developed to study the influence of longitudinal prestress on the behaviour of high-strength concrete hollow beams under pure torsion. The pre-cracking, the post-cracking and the ultimate behaviour are analysed. Three tests were carried out on large hollow high-strength concrete beams with similar concrete strength. The variable studied was the level of longitudinal uniform prestress. Some important conclusions on different aspects of the beams’ behaviour are presented. These conclusions, considered important for the design of box bridges, include the influence of the level of prestress in the cracking and ultimate behaviour.

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