Investigation on the performance of fiber reinforced concrete subjected to standard fire exposure

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Alwyn Varghese ◽  
Anand N. ◽  
Diana Andrushia ◽  
Prince Arulraj
Keyword(s):  
Reinforced Concrete ◽  
Modulus Of Elasticity ◽  
Empirical Relationship ◽  
Research Work ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Content Type ◽  
Standard Fire ◽  
Fire Curve ◽  
Heated Concrete

Purpose Aim of this research work is to examine the stress–strain behavior and modulus of elasticity of fiber-reinforced concrete (FRC) exposed to elevated temperature. The purpose of this paper is to study the effect of standard fire exposure on the mechanical and microstructure characteristics of concrete specimens with different strength grade. Design/methodology/approach An electrical bogie hearth furnace was developed to simulate the ISO 834 standard fire curve. Specimens were exposed to high temperatures of 821°C, 925°C and 986°C for the duration of 30, 60 and 90 min, respectively, as per standard fire curve. Peak stress, peak strain, modulus of elasticity and damage level of heated concrete specimens were evaluated by experimental investigation. SEM-based microstructure investigation has been carried out to analyze the microstructure characteristics of heated concrete specimens. Findings The results revealed that carbon fiber reinforced concrete was found to be better than the FRC made with other fibers on improving the modulus of elasticity of concrete. An empirical relationship has been established to predict the modulus of elasticity of temperature exposed specimens with different type of fiber and grade of concrete. In comparison with low melting point fibers, high melting point fibers exhibited higher modulus of elasticity under all tested conditions. Surface damage and porosity level of concrete with carbon and basalt fibers were found to be lower than other FRC. Originality/value Empirical relationship was developed to determine the modulus of elasticity of concrete exposed to elevate temperature, and this will be useful for concrete design applications. This research work may be useful for finding the residual compressive strength of concrete exposed to elevate temperature. So that it will be helpful to identify the suitable repair/retrofitting technique for reinforced concrete elements.

scholarly journals Experimental Research on Deep Beam using Hybrid Fiber Reinforced Concrete with M-Sand

2020 ◽  
Vol 9 (9) ◽  
pp. 305-308
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Research Work ◽  
Fiber Reinforced Concrete ◽  
Polypropylene Fibers ◽  
Deep Beam ◽  
Fiber Reinforced ◽  
Fresh Properties ◽  
Hybrid Fiber ◽  
Different Types

Concrete is hard but liable to break easily. Hybrid fiber reinforced concrete offers several economical and technical benefits. The use of fibers extends its possibilities. The hybridization of different types of fibers may play important roles in arresting cracks and thus achieve high performance of concrete. The main reason for adding glass ,steel and polypropylene to improve the ductility of concrete.The present research work is aimed at studying, the deep beam using three different types of fibers such as glass 0.3%, steel 0.75% & 1% and polypropylene fibers 0.3% were added to volume of concrete. The mix design has been arrived based on IS code method for M20 grade of concrete. An investigation is carried out to evaluate the fresh Properties and mechanical Properties of Hybrid Fiber Reinforced Concrete (HFRC). The result shows that hybrid fiber reinforced deep beams achieved better performance than the ordinary RC deep beam under application of load.

scholarly journals AN INVESTIGATION ON THE SHRINKAGE CHARACTERISTICS OF HYBRID FIBER REINFORCED CONCRETE PRODUCED BY USING FIBERS OF DIFFERENT ASPECT RATIO

2020 ◽  
Author(s):  
Rudraswamy M P ◽  
B.R Patagundi ◽  
K.B Prakash
Keyword(s):  
Reinforced Concrete ◽  
Aspect Ratio ◽  
Research Work ◽  
Fiber Reinforced Concrete ◽  
Future Research ◽  
Bench Mark ◽  
Fiber Reinforced ◽  
Aspect Ratios ◽  
Fiber Materials ◽  
Reinforcing Fiber

In the present paper, effects of shrinkage in fiber reinforced concrete are studied.Here, in the current research work, an attempt is made to study the effects onshrinkage of concrete when five different fiber materials are used for reinforcing plainconcrete. Three configurations of each reinforcing fiber material is studied. Fiberaspect ratios of 40 and 100 and a combination of the fibers of the two aspect ratios inequal proportion (hybrid) make up the three configurations for one individual fibermaterial reinforcement. Shrinkage values are indicated in terms of total length ofcrack and the total area of the crack. On-field measurement of crack dimensions atperiodic time intervals ranging from 0 minutes to 28 days after casting of concrete hasbeen undertaken to determine the accurate values of shrinkage cracks in the fifteenscenarios i.e. five reinforcing fiber materials with three configurations each usingaspect ratio of fibers 40, 100 and the hybrid (40 +100) case. It is seen that,irrespective of the material of fiber used for reinforcing concrete, hybridized concreteconsistently shows better results relative to single aspect ratio fiber reinforcement.This research also aims to provide a bench mark for future research works onshrinkage characteristics of hybridized fiber reinforced concrete

scholarly journals Experimental investigation of stress-strain properties of steel fiber reinforced concrete of the higher classes

2020 ◽  
Vol 17 (6) ◽  
pp. 77-82
Author(s):  
A. O. Khegai ◽  
◽  
N. M. Kirilin ◽  
T. S. Khegai ◽  
O. N. Khegai ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Modulus Of Elasticity ◽  
Steel Fiber ◽  
Deformation Modulus ◽  
Fiber Reinforcement ◽  
Fiber Reinforced Concrete ◽  
Tangent Modulus ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete

The tangent modulus of elasticity and deformation modulus are the most important characteristics of steel fiber reinforced concrete. The tangent modulus of elasticity corresponds to the initial loading stage, whereas in the operation stage and the fracture stage, there is a modulus of the material deformation, which is smaller, due to the formation of cracks in the element and non-linear behavior of the material. The paper presents experimental investigations of the tangent modulus of elasticity and the deformation modulus of fiber-reinforced concrete, class В60 at various percentages of fiber reinforcement. Existing approaches to determination of the tangent modulus of elasticity are considered. The results obtained are compared with those presented by other researchers. Analytical dependence is proposed for determination of deformation modulus depending on the percentage of fiber reinforcement.

scholarly journals MECHANICAL PROPERTIES OF WASTE PLASTIC BANNER FIBER REINFORCED CONCRETE

2018 ◽  
Vol 80 (5) ◽  
Author(s):  
Agustinus Agus Setiawan ◽  
Fredy Jhon Philip ◽  
Eka Permanasari
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Reinforced Concrete ◽  
Modulus Of Elasticity ◽  
Splitting Tensile Strength ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Concrete Compressive Strength ◽  
Waste Plastic

The objective of this research is to determine the mechanical properties of the waste-plastic-banner-fiber reinforced concrete: compressive strength, splitting tensile strength, rupture modulus and modulus of elasticity. Concrete mixtures with different proportions of waste plastic banner fiber were produced and tested: 0%, 0.25%, 0.5%, 1.0%, 2.0% of waste plastic banner fiber. The tests showed that the addition of fiber by 0.5% from the total concrete volume will increase the splitting tensile strength by 14.28% and produce the modulus of elasticity as high as 23,025 MPa (up to 12% from the normal mix)  and yield the concrete compressive strength of 35.56 MPa (up to 4.95% of the normal mixture). The rupture modulus will increase by 4.11% as the addition of 0.25% of waste plastic banner fiber. 

Flexural Fatigue Behavior of PAN Fiber Reinforced Concrete under Cyclic Loading

2010 ◽  
Vol 168-170 ◽  
pp. 2143-2149
Author(s):  
Wei Dong Zhuo ◽  
Shang Guan Ping ◽  
Yin Gu
Keyword(s):  
Reinforced Concrete ◽  
Damage Mechanics ◽  
Fatigue Testing ◽  
Fatigue Behavior ◽  
Research Work ◽  
Fiber Reinforced Concrete ◽  
Experimental Program ◽  
Fiber Reinforced ◽  
Flexural Fatigue ◽  
Pan Fiber

The flexural fatigue performance of polyacrylonitrile (PAN) fiber reinforced concrete (PANFRC）was investigated by third-point loading tests. Based on the previous research work, optimum mixture proportions of PANFRC for highway overlays and bridge decks that satisfied both the minimum compressive and bending strengths, and showed excellent mechanical properties, were selected for fatigue testing. The experimental program included a total of 69 flexural specimens, 15 of which were plain concrete specimens, and the remaining 54 specimens were PANFRC specimens. Three mixes containing 0.0%, 0.1 %, and 0.15% of PAN fiber volume fractions were selected. For each mix, 4 different target load ranges were applied: 10–75%, 10–80%, 10–85%, and 10–90% of the ultimate flexural capacity, as obtained from the corresponding control static test. The bending fatigue life of PANFRC specimens under various stress ratios are proved to follow two-parameter Weibull distribution. Both a semi-logarithm and a double-logarithm P-S-N equations with various failure probabilities are derived from the experimental measurements. The denifition of the fatigue damage variable and damage evolution equation for PANFRC are furtherly proposed based on theory of continuum damage mechanics.

scholarly journals Experimental Investigation of the Physical and Mechanical Properties of Sisal Fiber-Reinforced Concrete

Fibers ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 53 ◽  
Author(s):  
Abass Okeola ◽  
Silvester Abuodha ◽  
John Mwero
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Reinforced Concrete ◽  
Water Absorption ◽  
Modulus Of Elasticity ◽  
Physical And Mechanical Properties ◽  
Fiber Reinforced Concrete ◽  
Sisal Fiber ◽  
Fiber Reinforced ◽  
Split Tensile Strength

Concrete is a very popular material in the construction industry—it is, however, susceptible to quasi-brittle failure and restricted energy absorption after yielding. The incorporation of short discrete fibers has shown great promise in addressing these shortfalls. A natural fiber such as sisal is renewable, cheap, and easily available. It has also exhibited good tensile strength and can significantly improve the performance of concrete. In this study, the physical and mechanical properties of sisal fiber-reinforced concrete were reported. Sisal fibers were added in the mix at percentages of 0.5%, 1.0%, 1.5%, and 2.0% by weight of cement. Physical properties measured are workability, water absorption, and density while mechanical properties reported are compression strength, split tensile strength, and static modulus of elasticity. The computed modulus of elasticity of sisal fiber-reinforced concrete was compared with predicted values in some common design codes. From the study, it was concluded that sisal fiber can enhance the split tensile strength and Young’s modulus of concrete but cannot improve its workability, water absorption, and compressive strength.

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