scholarly journals DETERMINATION OF ASPHALT CONCRETE VISCOSITY BY THE FOUR-POINT BENDING TEST

2019 ◽  
Vol 7 (9) ◽  
pp. 415-426
Author(s):  
J. R. Spínola ◽  
A. C. L. Da Silva ◽  
A. P. Torres ◽  
C. A. Frota ◽  
H. O. Frota
Keyword(s):  
Asphalt Concrete ◽  
Strain Curve ◽  
Young Modulus ◽  
Bending Test ◽  
Loading Frequency ◽  
Calcined Clay ◽  
Four Point Bending ◽  
Damping Parameter ◽  
Natural Vibration Mode ◽  
Four Point Bending Test

In this work, a model for the dynamical four-point bending test is present, with particular emphasis on application to an asphalt concrete (AC) composite, a viscoelastic material, based on the Euler-Bernoulli theory, which approaches an equation where the Young modulus E can be substituted by the operator (E + γ∂/∂t), where γ is an internal damping parameter associated to the binder viscoelasticity and t is the time. As course aggregate in the composition of the AC mixture, the sintered aggregate of calcined clay was used, interesting to be employed as an alternative to the lack of natural course aggregate in some regions of the planet, where the presence of sedimentary rocks prevails. The results indicated that γ decreases with the temperature and loading frequency and the apparent noise in the stiffness versus strain curve is resulted from the natural vibration mode of the beam.

scholarly journals Comparison of the two point bending and four point bending test methods for aged asphalt concrete field samples

2014 ◽  
Vol 48 (9) ◽  
pp. 2901-2913 ◽  
Author(s):  
Lily D. Poulikakos ◽  
Michel Pittet ◽  
Andre-Gilles Dumont ◽  
Manfred N. Partl
Keyword(s):  
Asphalt Concrete ◽  
Test Methods ◽  
Bending Test ◽  
Four Point Bending ◽  
Field Samples ◽  
Aged Asphalt ◽  
Four Point Bending Test

Prediction of Fatigue Life of Steel-Slag Asphalt Concrete Based on Four Point Bending Test

2014 ◽  
Vol 599 ◽  
pp. 208-211
Author(s):  
Xin Yan Zhang ◽  
Liang Liang Tu ◽  
Yang Gao ◽  
Shan Li
Keyword(s):  
Fatigue Life ◽  
Asphalt Concrete ◽  
Steel Slag ◽  
Asphalt Mixture ◽  
Bending Test ◽  
Asphalt Pavements ◽  
Comprehensive Investigation ◽  
Moisture Sensitivity ◽  
Four Point Bending ◽  
Four Point Bending Test

Steel slag reserves of our country has reached 200 million tons and each year it will increase 100 million tons. Slag accumulation occupied a large number of enterprises space and made pollution to the environment. Since steel slag based asphalt pavements have been utilized for a certain history, their fatigue life necessitates comprehensive investigation imperatively. In this paper, the fatigue life of steel-slag asphalt mixture was tested through the four-point bending test. The results showed that steel slag prepared mixture was superior to limestone mixture after several freeze-thaws, with respect to moisture sensitivity, and was suitable for asphalt treated base (ATB). The fatigue life of slag asphalt mixture with low content limestone was longer.

scholarly journals Investigation of the Elastic Modulus of Polymer Sleepers Under a Quasistatic and Cyclic Loading

2019 ◽  
Vol 15 (2) ◽  
pp. 125-133
Author(s):  
Vít Lojda ◽  
Aran van Belkom ◽  
Hana Krejčiříková
Keyword(s):  
Elastic Modulus ◽  
Cyclic Loading ◽  
Prestressed Concrete ◽  
Load Level ◽  
Bending Test ◽  
Elastic Behaviour ◽  
Loading Frequency ◽  
Wheel Load ◽  
Four Point Bending ◽  
Four Point Bending Test

AbstractIn ballasted track, the wheel load is transmitted to the subgrade via sleepers commonly made of impregnated wood, prestressed concrete, steel or recently developed polymer sleepers. Mentioned material types of sleepers are characterized by different elastic moduli being a key parameter in any numerical model. Hence, this paper aims to determine the elastic modulus of sleepers subjected to a laboratory four-point bending test. Traffic resembling load level of 60 kN adopted from a typical axle load distributed by the rails to the sleeper was applied in a quasistatic and cyclic loading. The samples included sleepers made of polymers complemented with wood and pre-stressed concrete. The results of this paper are based on the elastic modulus investigation. Main conclusions are focused on the sleeper’s elastic modulus under changing loading frequencies. Wood and prestressed concrete sleepers indicated mainly elastic behaviour resulting in a constant elastic modulus. However, polymer sleepers showed a loading frequency dependent elastic modulus as a result of their viscous elastic behaviour. Moreover, the conclusions of this paper involve E-modulus measurements of impregnated beech sleepers in order to describe their piece by piece elasticity variation due to their natural origin.

scholarly journals Interference of natural vibrations in four-point bending test on beams with asphalt composite made with calcined clay aggregate

Cerâmica ◽  
2021 ◽  
Vol 67 (383) ◽  
pp. 344-350
Author(s):  
A. C. L. da Silva ◽  
C. L. da Silva ◽  
A. K. C. Monteiro ◽  
C. A. Frota
Keyword(s):  
Bending Test ◽  
Natural Vibrations ◽  
Calcined Clay ◽  
Four Point Bending ◽  
Four Point Bending Test

scholarly journals Structural behaviour of PSCC slab panel under four-point bending test

2021 ◽  
Vol 1144 (1) ◽  
pp. 012039
Author(s):  
M A Iman ◽  
N Mohamad ◽  
A A A Samad ◽  
Steafenie George ◽  
M A Tambichik ◽  
...  
Keyword(s):  
Bending Test ◽  
Structural Behaviour ◽  
Four Point Bending ◽  
Four Point Bending Test

Manufacturing a carbon/epoxy NACA 23018 airfoil skin using a circular braiding machine: experimental and numerical study

2021 ◽  
pp. 152808372199377
Author(s):  
Jalil Hajrasouliha ◽  
Mohammad Sheikhzadeh
Keyword(s):  
Numerical Study ◽  
Filament Winding ◽  
Bending Test ◽  
Elastic Response ◽  
Manufacturing Processes ◽  
Fiber Reinforced Composite ◽  
Four Point Bending ◽  
Reinforced Composite ◽  
Four Point Bending Test ◽  
Meso Scale

In the interest of reducing the weight and also cost of blade skins, various automatic preform manufacturing processes were developed including tape laying, filament winding and braiding. Among them, the circular braiding process was found to be an efficient method in producing seamless preforms on mandrels with various geometries. In this regard, an attempt was made to produce a carbon fiber reinforced composite with the shape of NACA 23018 airfoil using a circular braiding machine. Thus, suitable wooden mandrels were manufactured using NACA 23018 airfoil coordinates, which were obtained by assuming the perimeter of 20 cm. Furthermore, both biaxially and triaxially braided preforms were produced and subsequently impregnated with epoxy resin through an appropriate fabrication method. To assess their performance, four-point bending test was carried out on samples. Ultimately, the elastic response of braided composite airfoils was predicted using a meso-scale finite element modeling and was validated with experimental results.

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