Basalt fiber reinforced porous aggregates-geopolymer based cellular material

2015 ◽  
Vol 08 (01) ◽  
pp. 1550005 ◽  
Author(s):  
Xin Luo ◽  
Jin-Yu Xu ◽  
Weimin Li
Keyword(s):  
Basalt Fiber ◽  
Strain Curve ◽  
Civil Defense ◽  
Cellular Material ◽  
High Plasticity ◽  
Fiber Reinforced ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Energy Absorbing ◽  
The Ideal

Basalt fiber reinforced porous aggregates-geopolymer based cellular material (BFRPGCM) was prepared. The stress–strain curve has been worked out. The ideal energy-absorbing efficiency has been analyzed and the application prospect has been explored. The results show the following: fiber reinforced cellular material has successively sized pore structures; the stress–strain curve has two stages: elastic stage and yielding plateau stage; the greatest value of the ideal energy-absorbing efficiency of BFRPGCM is 89.11%, which suggests BFRPGCM has excellent energy-absorbing property. Thus, it can be seen that BFRPGCM is easy and simple to make, has high plasticity, low density and excellent energy-absorbing features. So, BFRPGCM is a promising energy-absorbing material used especially in civil defense engineering.

Behavior and modeling of post-heated circular concrete specimens repaired with fiber-reinforced polymer composites

2021 ◽  
pp. 136943322110585
Author(s):  
Seyed Mehrdad Elhamnike ◽  
Rasoul Abbaszadeh ◽  
Vahid Razavinasab ◽  
Hadi Ziaadiny
Keyword(s):  
Strain Curve ◽  
Concrete Columns ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Concrete Members ◽  
Frp Composites ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites

Exposure of buildings to fire is one of the unexpected events during the life of the structure. The heat from the fire can reduce the strength of structural members, and these damaged members need to be strengthened. Repair and strengthening of concrete members by fiber-reinforced polymer (FRP) composites has been one of the most popular methods in recent years and can be used in fire-damaged concrete members. In this paper, in order to provide further data and information about the behavior of post-heated circular concrete columns confined with FRP composites, 30 cylindrical concrete specimens were prepared and subjected under four exposure temperatures of 300, 500, 700, and 900. Then, specimens were repaired by carbon fiber reinforced polymer composites and tested under axial compression. Results indicate that heating causes the color change, cracks, and weight loss of concrete. Also, with the increase of heating temperature, the shape of stress–strain curve of FRP-retrofitted specimens will change. Therefore, the main parts of the stress–strain curve such as ultimate stress and strain and the elastic modulus will change. Thus, a new stress–strain model is proposed for post-heated circular concrete columns confined by FRP composites. Results indicate that the proposed model is in a good agreement with the experimental data.

Polypropylene Fiber Reinforced Concrete for Airfield Pavements:Modeling of Stress-Strain Curve Under Compression

2011 ◽  
Vol 261-263 ◽  
pp. 171-177
Author(s):  
Tammam Merhej ◽  
De Cheng Feng
Keyword(s):  
Reinforced Concrete ◽  
Analytical Model ◽  
Volume Fraction ◽  
Polypropylene Fiber ◽  
Strain Curve ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Polypropylene Fiber Reinforced Concrete

An analytical model for compressive stress-strain curve of polypropylene fiber reinforced concrete (PPFRC) was proposed. The polypropylene fiber used was 60-mm long twisted fiber with aspect ratio of 120. The fiber was added in three volume fractions 0.2%, 0.4% and 0.6%. Tow concrete mixtures with varying water-cement ratio were used. The accuracy of the proposed model was evaluated by comparing the area under stress-strain curves for experimental and analytical model. The results showed good agreement between the experimental and analytical curves. In addition; empirical equations were proposed to quantify the effect of polypropylene fiber on compressive strength, strain at peak stress, and toughness of concrete in terms of fiber volume fraction.

scholarly journals Stress-Strain Relationship of Steel Fiber Reinforced Alkali Activated Slag Concrete under Static Compression

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Xiaohui Yuan ◽  
Huiting Guan ◽  
Yanyu Shi
Keyword(s):  
Damage Evolution ◽  
Steel Fiber ◽  
Strain Curve ◽  
Fiber Reinforced ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Alkali Activated Slag ◽  
Strain Relationship ◽  
Activated Slag ◽  
Alkali Activated

Stress-strain curve can accurately reflect the mechanical behavior of materials, and it is very important for structural design and nonlinear numerical analysis. Some cube and prism specimens were made to investigate the physical and mechanical properties of steel fiber reinforced alkali activated slag concrete (AASC); test results show that the strength, Young’s Elastic Modulus, and Poisson’s ratio all increase with the increase of steel fiber content. The steel fiber reinforced AASC shows an excellent postcracking behavior. Damage evolution parameter (D) was used to describe the formation and propagation of cracks, and continuum damage evolution model of steel fiber reinforced AASC was established by Weibull and Cauchy distribution. The establishing model can well describe the geometric characteristics of the key points of the concrete materials stress-strain curve. Finally, the accuracy of the model was verified by comparing the test stress-strain relationship curve of steel fiber reinforced AASC.

scholarly journals Study on The Mechanical Properties of Steel - Basalt Fiber Composite Reinforcement (SBFCBs)

2020 ◽  
Vol 165 ◽  
pp. 05028
Author(s):  
Lei Zhao ◽  
Shengjiang Sun ◽  
Wei Qi
Keyword(s):  
Elastic Modulus ◽  
Fiber Composite ◽  
Low Cost ◽  
Basalt Fiber ◽  
Strain Curve ◽  
Tensile Tests ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Failure Patterns ◽  
Steel Bars

Steel bar and Basalt Fiber are combined to obtain a new structural material with high strength, high elastic modulus, high toughness, corrosion resistance, low cost and other excellent comprehensive performance: Steel Basalt Fiber Composite Bars (SBFCBs). In this paper, three different types of composite bars were tested by monotonic tensile tests, and the failure patterns of steel bars were introduced in the process of stretching, and the yield strength, ultimate strength, elastic modulus and stress-strain curves of steel bars were obtained. Test results showed that the stress-strain curve of SBFCBs was obviously double-folded, and SBFCBs exhibited stable post-yielding stiffness after the reinforcement yielded. The stress-strain curve model of SBFCBs under uniaxial tension was derived according to the material’s compounding rule. By sorting the experimental data and comparing it with theoretical values, we could prove the accuracy of the model.

scholarly journals Low-Temperature Performance and Damage Constitutive Model of Eco-Friendly Basalt Fiber–Diatomite-Modified Asphalt Mixture under Freeze–Thaw Cycles

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2148 ◽  
Author(s):  
Yongchun Cheng ◽  
Di Yu ◽  
Guojin Tan ◽  
Chunfeng Zhu
Keyword(s):  
Low Temperature ◽  
Asphalt Mixture ◽  
Basalt Fiber ◽  
Strain Curve ◽  
Strain Ratio ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Freeze Thaw ◽  
Strain Relationship ◽  
Damage Constitutive Model

Asphalt pavement located in seasonal frozen regions usually suffers low-temperature cracking and freeze–thaw damage. For this reason, diatomite and basalt fiber were used to modify asphalt mixtures. An indirect tensile test was used to determine the low-temperature performance of the asphalt mixture. The influences of freeze–thaw (F–T) cycles on strength, tensile failure strain, stiffness modulus, and strain energy density were analyzed. The variation of the stress–strain curve under F–T cycles was analyzed. The stress–strain curve was divided into a linear zone and nonlinear zone. The linear zone stress ratio and linear zone strain ratio were proposed as indexes to evaluate the nonlinear characteristics of the stress–strain curve. The results show that the basalt fiber–diatomite-modified asphalt mixture had better low temperature crack resistance and antifreeze–thaw cycles capacity compared to the control asphalt mixture. The F–T cycles made the nonlinear characteristics of the stress–strain relationship of the asphalt mixture remarkable, and also decreased the linear zone stress ratio and linear zone strain ratio. The damage constitutive model established in this paper can describe the stress–strain relationship after F–T damage well.

The preparation of energy-absorbing material by using solid waste

RSC Advances ◽  
2015 ◽  
Vol 5 (12) ◽  
pp. 9283-9289 ◽  
Author(s):  
Xin Luo ◽  
Jin-yu Xu ◽  
Weimin Li
Keyword(s):  
Solid Waste ◽  
Basalt Fiber ◽  
Lightweight Aggregate ◽  
Cellular Material ◽  
Fiber Reinforced ◽  
New Energy ◽  
Absorbing Material ◽  
Energy Absorbing

In order to develop a new energy-absorbing material by using solid waste, a basalt fiber reinforced lightweight aggregate–geopolymer based cellular material (BFRLGCM) is prepared.

Research on the Stress-Strain Curve and Damage of Steel Fiber Reinforced Concrete under Uniaxial Loading

2011 ◽  
Vol 255-260 ◽  
pp. 383-388
Author(s):  
Run Nian Yang ◽  
De Min Wei
Keyword(s):  
Reinforced Concrete ◽  
Fatigue Failure ◽  
Steel Fiber ◽  
Strain Curve ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Static Failure

The static failure can be seen as a special fatigue failure, which means the static failure is the fatigue failure only bearing one cycle under the ultimate-strength loading. By learning from the analysis of fatigue damage, the stress- strain curve and damage of steel fiber reinforced concrete under uniaxial loading have been studied in this paper. The damage evolution equation can be derived from the damage theory, and it can be used to describe the relationship between the damage variable and strain. According to the strain equivalence principle, the corresponding constitutive equation considering damage can be obtained. Finally, comparisons among test results, the model and ansys simulation results show that the model is suitable to describe the uniaxial stress-strain curves of steel fiber reinforced concrete.

scholarly journals Investigation of the Mechanical Behavior of Polypropylene Fiber-Reinforced Red Clay

2021 ◽  
Vol 11 (22) ◽  
pp. 10521
Author(s):  
Jia Liu ◽  
Xi’an Li ◽  
Gang Li ◽  
Jinli Zhang
Keyword(s):  
Shear Strength ◽  
Polypropylene Fiber ◽  
Strain Curve ◽  
Triaxial Tests ◽  
High Water Content ◽  
Hyperbolic Model ◽  
High Plasticity ◽  
Fiber Reinforced ◽  
Red Clay ◽  
Stress Strain

Red clay is not easy to use as a natural foundation because of its high water content, high plasticity index, large void ratio, and susceptibility to shrinkage and cracking. In this study, consolidated undrained triaxial tests were conducted to examine the mechanical properties of polypropylene fiber-reinforced red clay and to analyze the influence of the fiber content (FC), fiber length (FL), and cell pressure on its shear strength. By performing a regression analysis on the test data, a hyperbolic constitutive model that considers the influence of FC, FL, and cell pressure was established, and a method was developed to estimate the parameters of the model. The findings show that, in contrast with the nonreinforced red clay, the fiber-reinforced red clay had a stress-strain curve characterized by typical strain hardening, with the shear strength increasing with FC, FL and cell pressure. The calculated results of the model coincide with the test results well, confirming that the hyperbolic model could appropriately describe the stress-strain relationship of polypropylene fiber-reinforced red clay and have reference value for the design and construction of fiber-reinforced red clay foundations.

Sign in / Sign up

Export Citation Format

Share Document