scholarly journals The effect of the type of fixators reinforcement on strength and deformation characteristics of reinforced concrete

2019 ◽  
Vol 97 ◽  
pp. 02034
Author(s):  
Evgenij Borisyuk
Keyword(s):  
Reinforced Concrete ◽  
Crack Resistance ◽  
Steel Reinforcement ◽  
Low Grade ◽  
High Grade ◽  
Building Structures ◽  
Deformation Characteristics ◽  
Reliable Operation ◽  
Different Types ◽  
Strength And Deformation

Rebar fixators of various types (plastic and concrete) became widespread with manufacturing of building structures of precast and monolithic reinforced concrete in order to fix steel reinforcement cage in strictly design position and to exclude the probability of its displacement during concreting. Such sufficiently rigid fixing is necessary for the following reliable operation of the structure in the building, as well as for the preservation of steel reinforcement which protected by a necessary layer of concrete from corrosion. Information available in the literature does not allow us to judge about the effects that different types of fixators apply to exploitative properties (such as strength and crack resistance) of reinforced concrete. The experiments, according to the accepted method, showed that these characteristics are slightly worse for the samples with plastic fixators and fixators made of low grade concrete than for the samples without fixators or fixators made of high grade concrete. On the base on the research results it becomes possible to substantiate the distinction between the areas of application of plastic and concrete fixatives

scholarly journals RETROFITTING AND DACTILITY OF REINFORCED CONCRETE BEAMS USING AN EXTERNAL REINFORCEMENT METHOD

2019 ◽  
Vol 3 (2) ◽  
pp. 135
Author(s):  
Novita Ike Triyuliani ◽  
Sri Murni Dewi ◽  
Lilya Susanti
Keyword(s):  
Reinforced Concrete ◽  
Ultimate Load ◽  
Concrete Beams ◽  
Concrete Block ◽  
Steel Reinforcement ◽  
Reinforced Concrete Beams ◽  
Building Structures ◽  
Average Increase ◽  
External Reinforcement ◽  
Strength And Ductility

The innovations strengthening building structures are important topics. Failure in structures such as beams and columns due to time, re-functions of a building, even initial design errors that are weak or lack the safety factor of a building structure. External reinforced concrete beams are one of the beams currently being developed. It is a concrete block with reinforcement of steel reinforcement on the outer (external) of the beam. This study aims to determine the index of increasing beam strength and ductility after retrofitting external steel reinforcement, which has the dimension of beams 15 x 15 x 100 cm, repeating 12 pcs, with external reinforcement each 6 pcs 2Ø6 and 3Ø6. The results from this study are an increasing the index of beam flexural strength after retrofit with external steel reinforcement. Meanwhile, beams after retrofit with 2Ø6 external steel have an average increase index of 1.25 and 1.21 while for external steel 3Ø6 are 1.29 and 1.60 respectively. The ductility depends on the value of ultimate load and maximum deflection that occurs, where the ductility value for the comparison of each specimen experiences a reduction in the average ductility value with 2Ø6 external steel which is 37.74% and 70.95% while with 3Ø6 external steel is 61,65% and 60.62%. Berbagai inovasi upaya peningkatan kekuatan struktur bangunan telah menjadi bahasan yang penting. Kegagalan pada struktur seperti balok dan kolom karena umur, alih fungsi suatu bangunan, bahkan kesalahan desain awal yang lemah atau kurang memenuhi faktor keamanan suatu struktur bangunan. Balok beton bertulangan eksternal adalah salah satu balok yang sedang dikembangkan pada saat ini, yaitu balok beton dengan perkuatan tulangan baja di sisi terluar (eksternal). Penelitian ini bertujuan untuk mengetahui indeks peningkatan kekuatan balok dan daktilitas setelah dilakukan perbaikan menggunakan tulangan baja eksternal, dengan dimensi balok 15 × 15 × 100 cm berulang 12 buah, penambahan tulangan baja eksternal masingmasing 6 buah 2Ø6 dan 3Ø6. Hasil yang didapat dari penelitian ini adalah indeks peningkatan kekuatan lentur balok setelah dilakukan perbaikan menggunakan tulangan baja eksternal. Dimana balok setelah dilakukan perbaikan dengan baja eksternal 2Ø6 memiliki indeks peningkatan rata-rata 1,25 dan 1,21 sedangkan untuk baja eksternal 3Ø6 masing-masing 1,29 dan 1,60. Daktilitas tergantung dari nilai beban ultimit dan lendutan maksimum yang terjadi, dimana nilai daktilitas untuk perbandingan tiap benda uji mengalami reduksi nilai daktilitas rata-rata dengan baja eksternal 2Ø6 yaitu sebesar 37,74% dan 70,95% sedangkan dengan baja eksternal 3Ø6 sebesar 61,65% dan 60,62%.

scholarly journals Effect of Vertical Drains on Strength and Deformation Characteristics of Lithomargic Clay

2019 ◽  
Vol 9 (2) ◽  
pp. 3199-3204
Keyword(s):  
Ground Improvement ◽  
Drainage System ◽  
Excess Pore Pressure ◽  
Deformation Characteristics ◽  
Vertical Drains ◽  
Lithomargic Clay ◽  
Different Types ◽  
Consolidation Rate ◽  
Strength And Deformation ◽  
Different Diameters

During olden days, construction used to be carried out only on the sites having good strength. But now-a-days availability of sites with favourable properties are limited. So, there is a need to modify the properties of subsoil using different types of Ground Improvement Techniques. Depending upon the nature of soil, a suitable economical technique needs to be adopted. Soft soils have weaker strength and they are highly compressible and take a lot of time for settlement. So, these are typically problematic for construction. There is a need to improve the condition by accelerating the rate of consolidation. To achieve higher rate of consolidation, it is important to develop shorter paths for movement of the water. A vertical drainage system can be provided to accelerate the rate of consolidation and help to minimise excess pore pressure in the sub-soil. As a result of this, a stable situation is reached more quickly. Thus to enhance the strength of the soil and to accelerate the consolidation rate, vertical drains of different diameters and with varied spacing are employed. The improvement in properties of soft consolidating lithomargic clay is experimentally tested with vertical sand drains in developed prototype. The vertical sand drains installed with 1.905 (0.75 inch) diameter and 6 cm spacing is more effective in increasing Ultimate Bearing Capacity (UBC) of soil and also the rate of settlement of 35.26 % is significant up to 60 kg of preloads. Thus problematic lithomargic clay can be improved in its strength and settlement characteristics

Fiber Concrete for Industrial and Civil Construction

2019 ◽  
Vol 945 ◽  
pp. 120-124 ◽  
Author(s):  
Sergey V. Klyuev ◽  
T.A. Khezhev ◽  
Yu.V. Pukharenko ◽  
A.V. Klyuev
Keyword(s):  
Steel Fiber ◽  
Building Structures ◽  
Deformation Characteristics ◽  
Fine Grained ◽  
Fiber Concrete ◽  
Concrete Mix ◽  
Strength And Deformation ◽  
Reinforcing Fiber ◽  
Industrial Sand ◽  
Optimal Type

In the article the questions of application of a steel fiber for disperse reinforcing of fine-grained concrete are considered. Main filler of a fiber concrete mix was the KMA industrial sand enriched with sand. The carried-out researches showed advantage of a steel wave fiber before the anchor and flat milled. The optimal type of fiber is revealed, in which the greatest increase of strength and deformation characteristics is observed. Thus, it can be concluded that the type of steel reinforcing fiber and its shape have a significant impact on the length of building structures and buildings as a whole.

scholarly journals JOINT WORK OF STEEL AND BASALT PLASTIC REINFORCEMENT WITH CONCRETE AS PART OF BEAM STRUCTURES

2021 ◽  
pp. 37-47
Author(s):  
I.A. Karpiuk ◽  
◽  
Ye.V. Klymenko ◽  
V.M. Karpiuk ◽  
A.S. A.S.Tselikova ◽  
...  
Keyword(s):  
Experimental Data ◽  
Crack Resistance ◽  
Graphical Analysis ◽  
Deformation Characteristics ◽  
Joint Work ◽  
Beam Structures ◽  
Strength And Deformation ◽  
Design Factors

Experimental data on strength, deflections and cracking in beams are presented. Beams are made with dimensions 2000x200x100mm with steel and basalt-plastic (BFRP) reinforcement. They have been tested for static and low-cycle reloading. The results of studies of the main parameters of the performance of research elements are presented in the form of the corresponding experimental-statistical dependences for the actions of operational and destructive loads with the same design factors. With the help of stochastic and graphical analysis, the influence of the type of reinforcement and design factors on the strength and deformation characteristics, as well as on the crack resistance of experimental samples - beams, is estimated.

scholarly journals Optimization of Composition and Technological Factors for the Lightweight Fiber-Reinforced Concrete Production on a Combined Aggregate with an Increased Coefficient of Structural Quality

2021 ◽  
Vol 11 (16) ◽  
pp. 7284
Author(s):  
Levon R. Mailyan ◽  
Alexey N. Beskopylny ◽  
Besarion Meskhi ◽  
Sergey A. Stel’makh ◽  
Evgenii M. Shcherban ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Reinforced Concrete ◽  
Fiber Reinforced Concrete ◽  
Structural Quality ◽  
Deformation Characteristics ◽  
Fiber Reinforced ◽  
Distribution Method ◽  
Concrete Production ◽  
Strength And Deformation ◽  
Control Composition

In recent years, developing lightweight concrete with both the necessary and sufficient strength characteristics is essential in the construction industry. This article studies the influence of the volumetric composition of lightweight fiber-reinforced concrete (LFRC) and the method of its distribution during the preparation of the fiber–concrete mixture on the strength and deformation characteristics of LFRC on a combined aggregate. The optimal grain size of the porous filler was calculated by the mathematical planning method of the experiment. Regression models of the strength and deformation characteristics on the volumetric content of fiber and its distribution method were obtained. The most effective combination of these factors has been determined. The model shows that the increase in compressive strength was 12%, the value of the prismatic strength increased by 25%, the bending tensile strength increased by 34%, and the axial tensile strength increased by 11%. The ultimate strains during axial compression decreased by 10%, axial tension decreased by 12%, and the elasticity modulus increased by 11% compared to the test results of the control composition samples without fiber and pumice. The coefficient of constructive quality (CCQ) of the LFRC on a combined aggregate compared to concrete with the control composition without fiber and pumice showed an increase of more than 32%. It was also found that fiber reinforcement with basalt fibers with a combination of heavy and porous aggregates achieves a synergistic effect together.

scholarly journals A Study of Flexural and Bending Strength of Steel, Polypropylene and Hybrid Fibre Reinforced Concrete without Adding Admixture

2018 ◽  
Vol 7 (2.24) ◽  
pp. 278
Author(s):  
M Tamil Selvi ◽  
Dasarathy A K ◽  
T S. Thandavamoorthy ◽  
FIE . ◽  
FIIT Arb ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Bending Strength ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Hybrid Fibers ◽  
Flexural Response ◽  
Hybrid Fibre ◽  
Deformation Properties ◽  
Different Types ◽  
Strength And Deformation

The present study has been taken up for evaluating the different types of concrete. Emphasis has been given to the strength and deformation properties of reinforced concrete beams.  This  paper  presents  the  results  of  an  experimental investigation carried out on four different types reinforced concrete beams, 150 mm  × 150  mm  × 700 mm in size. The beams were tested under one-third point loading. The results exhibited that the flexural strength of concrete are meaningfully improved by adding  steel, polypropylene and hybrid fibers.  Out of the three different types of fibers used in this study, the fibers with steel and hybrid showed better efficiency in improving the flexural response.  

Composite Reinforcement as a Way to Increase the Durability of Building Structures

2020 ◽  
Vol 869 ◽  
pp. 336-341
Author(s):  
Varvara Rumyantseva ◽  
Viktoriya Konovalova
Keyword(s):  
Mass Transfer ◽  
Corrosion Resistance ◽  
Reinforced Concrete ◽  
Limit State ◽  
Electrochemical Corrosion ◽  
Steel Reinforcement ◽  
Building Structures ◽  
Cement Concrete ◽  
Transfer Parameters ◽  
Corrosion Of Steel

The study of liquid corrosion of cement concrete was carried out, the results of which allow to determine the mass transfer parameters in the studied system and calculate the service life of the concrete product in environments of varying degrees of aggressiveness. Dates of the beginning of electrochemical corrosion of steel reinforcement in reinforced concrete and the achievement of the limit state of steel reinforcement in the conditions of liquid corrosion of reinforced concrete in a chloride-containing medium were mathematically calculated and experimentally established. Investigations of the corrosion resistance of fiberglass reinforcement in various environments have been carried out. The possibility of replacing steel reinforcement with fiberglass when reinforcing concrete products is considered.

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