scholarly journals Stress-Strain Relation of Steel-Polypropylene-Blended Fiber-Reinforced Concrete under Uniaxial Cyclic Compression

2018 ◽  
Vol 2018 ◽  
pp. 1-19 ◽  
Author(s):  
Lihua Xu ◽  
Biao Li ◽  
Yin Chi ◽  
Changning Li ◽  
Biao Huang ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Stress ◽  
Fiber Reinforced Concrete ◽  
Stiffness Degradation ◽  
Cyclic Behavior ◽  
Fiber Reinforced ◽  
Stress Strain ◽  
Volume Fractions ◽  
Cyclic Compression ◽  
Aspect Ratios

This paper investigates the cyclic stress-strain behavior of steel-polypropylene-blended fiber-reinforced concrete (BFRC) under uniaxial cyclic compression. A total of 48 prism specimens were tested for different fiber volume fractions and aspect ratios. The results show that the introduction of blended fibers has synergetic effects on improving the cyclic behavior of concrete in terms of peak strength, postpeak ductility, hysteretic energy dissipation, and stiffness degradation. Moreover, the increase in the volume fractions of both steel and polypropylene fibers can lead to a remarkable decrease in plastic strain accumulation. Furthermore, the stiffness degradation ratio as well as the stress deterioration ratio of BFRC can be significantly alleviated in comparison with those of plain concrete, notwithstanding that the degradation amount is insensitive to the variations of fiber parameters. Subsequently, based on the test results, a constitutive model is developed to generalize the cyclic stress-strain responses of BFRC, with the contributions of blended fibers taken into account. The developed model is then verified by independent experimental results and other test data reported in the literature. It is observed that the prediction yields a close estimation of the cyclic compressive behavior of BFRC with varying fiber parameters.

scholarly journals Damage Evolution of Steel-Polypropylene Hybrid Fiber Reinforced Concrete: Experimental and Numerical Investigation

2018 ◽  
Vol 2018 ◽  
pp. 1-23
Author(s):  
Lihua Xu ◽  
Cuimei Wei ◽  
Biao Li
Keyword(s):  
Reinforced Concrete ◽  
Damage Evolution ◽  
Fiber Reinforced Concrete ◽  
Stiffness Degradation ◽  
Fiber Types ◽  
Peak Strain ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Volume Fractions ◽  
Aspect Ratios

This paper presents an experimental investigation on the stress-strain behavior and damage evolution of steel-polypropylene hybrid fiber reinforced concrete (HFRC) with different fiber types, volume fractions, and aspect ratios. The damage evolution laws of HFRC were obtained using uniaxial cyclic compression and tension tests. The results show that the addition of hybrid fiber has a significant synergetic effect on the mechanical behavior of concrete. The peak strength, peak strain, toughness, and postpeak ductility of HFRC under both tension and compression are improved, and the damage accumulation and stiffness degradation are alleviated by increasing volume fractions of SF and PF, as well as aspect ratios of SF. Moreover, the steel fiber volume fraction shows a more pronounced effect than that of other considered factors on the enhancement of cyclic mechanical parameters of HFRC. Based on the unloading stiffness degradation process, analytical equations were, respectively, proposed to generalize the damage progression of HFRC under compression and tension, with the effects of hybrid fiber taken into consideration. Finally, the proposed uniaxial damage evolution equations combined with the calibrated concrete damaged plasticity (CDP) model in ABAQUS were used to predict the responses of HFRC materials and structural members subjected to shear and seismic loads. The comparisons between the numerical predictions and experimental results show a good agreement.

scholarly journals Cyclic behavior of ultra-high performance fiber reinforced concrete beam-column joint

2018 ◽  
Vol 20 (1) ◽  
pp. 348-360 ◽  
Author(s):  
Patricia A. Sarmiento ◽  
Benjamín Torres ◽  
Daniel M. Ruiz ◽  
Yezid A. Alvarado ◽  
Isabel Gasch ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Fiber Reinforced Concrete ◽  
Cyclic Behavior ◽  
Fiber Reinforced ◽  
High Performance Fiber ◽  
Column Joint

scholarly journals Stress-strain curves for steel fiber-reinforced concrete in compression

2010 ◽  
Vol 15 (2) ◽  
pp. 260-266 ◽  
Author(s):  
Luiz Álvaro de Oliveira Júnior ◽  
Vanessa Elizabeth dos Santos Borges ◽  
Alice Ribeiro Danin ◽  
Daiane Vitória Ramos Machado ◽  
Daniel de Lima Araújo ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Steel Fiber ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Stress Strain

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 Near Surface Characteristic: Hybrid Fiber Reinforced Concrete With Different Aspect Ratio

2019 ◽  
Vol 8 (3) ◽  
pp. 1025-1028
Keyword(s):  
Reinforced Concrete ◽  
Aspect Ratio ◽  
Water Absorption ◽  
Surface Characteristics ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Near Surface ◽  
Aspect Ratios ◽  
Different Types

The present work is enhancement of near surface characteristics for hybrid fiber reinforced concrete (aspect ratio 40+100). Here in this research work an attempt has made to study water absorption values for different types of fiber reinforced concrete, which are having different aspect ratios like 40, 100 and 40+100. Concrete mix along with fibers are casted and cured for 28days. Both water absorption test and sorptivity tests carried on hardened concrete. The main objective is to check variation in absorption values due to addition of different types of fibers. Here totally five different types of fibers are considered like steel fiber, Galvanized iron fibres, High density polyethylene fibres, waste plastic fiber and polypropylene fibers Experimental investigation shows that except polyprolene hybrid mix concrete other hybrid mixes has showed good results. But as compared to mono fiber reinforced concrete hybrid fiber reinforced concrete has showed better results. This research was aimed to provide benchmark for future research works on near surface characteristics of hybrid fiber reinforced concrete.

Diagram of Non-Linear Straining of Carbon-Fiber Reinforced Concrete at Static Effect

2016 ◽  
Vol 871 ◽  
pp. 173-181 ◽  
Author(s):  
Vasiliy Plevkov ◽  
Vyacheslav Belov ◽  
Igor Baldin ◽  
Andrey Nevskiy ◽  
Anatoliy Veselov ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Concrete Strength ◽  
Experimental Studies ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Stress Strain ◽  
Non Linear ◽  
Static Effect ◽  
Carbon Fiber Reinforced

The article reflects the results of experimental studies of carbon-fiber reinforced concrete under compression and tension. Qualitative change of concrete strength and stress-strain properties at its dispersed reinforcement with carbon fibers is fixed. As a result of the statistic processing of experimental data, analytical dependencies for determination of carbon-fiber reinforced concrete main strength and stress-strain characteristics under compression and tension are suggested. Calculation diagram of non-linear straining of carbon-fiber reinforced concrete at static effect is presented.

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