MECHANICAL BEHAVIOR OF COLD BITUMINOUS MIXTURE UNDER EFFECTS OF STATIC AND REPEATED LOADS1

Abstract This paper presents the results of an experimental research aimed at analyzing the mechanical behavior of a cold bituminous mixture under effects of static and repeated loads. Initially, a Marshall mixture design was performed to determine the mixture design contents according to standard DNER (1994a). After obtaining the mixture design contents, nine bituminous specimens were molded and subjected to the following tests: resilient modulus, tensile strength by diametral compression, and fatigue. The Marshall stability, independent from the mixture content used, surpassed the minimum limit recommended by the service specification DNIT (2010a). Regarding the Marshall flow, the values found exceeded the required by the referred specification. The results obtained for the average tensile strength by diametral compression, resilient modulus and fatigue life of the bituminous mixture were, respectively, 0.47 MPa, in the range of 1530-1837 MPa, and lower than 1000 cycles (for most stress differences applied), which were lower than those commonly reported for hot mixtures.

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Investigating the Effect of Anti Stripping Agents (ASAs) on Fatigue and Rutting Properties of Stone Matrix Asphalt (SMA) Mixtures Modified by Ground Tire Rubber (GTR) and Waste Polyethylene Terephthalate (PET)

10.20944/preprints202004.0059.v1 ◽

2020 ◽

Author(s):

Alireza Ameli ◽

Javad Maher ◽

Amir Mosavi ◽

Narjes Nabipour ◽

Rezvan Babagoli ◽

...

Keyword(s):

Tensile Strength ◽

Fatigue Life ◽

Polyethylene Terephthalate ◽

Resilient Modulus ◽

Tire Rubber ◽

Ground Tire Rubber ◽

Rutting Resistance ◽

Stone Matrix Asphalt ◽

Waste Polyethylene ◽

Stone Matrix

The current study assessed the influence of Anti Stripping Agents (ASA), Ground Tire Rubber (GTR) and waste polyethylene terephthalate (PET) on performance behavior of binder and Stone Matrix Asphalt (SMA) mixtures. Through this paper, the 85/100 penetration grade bitumen was utilized as original bitumen. Also, three liquid ASA’s (ASA (A), ASA (B), ASA (C)) were used as a mixture modifier. For this purpose, softening point, penetration, rotational viscosity, Dynamic Shear Rheometer, Multi Stress Creep Recovery (MSCR) and Linear Amplitude Sweep (LAS) tests were implemented to investigate the rheological properties of modified bitumen. For evaluating the behavior of modified mixtures several tests such as; Resilient Modulus, Tensile Strength, dynamic creep, wheel track and four-point beam fatigue tests were implemented. Based on MSCR test results, utilization of mentioned polymers enhanced the elasticity of bitumens and therefore the permanent deformation resistance of binders increases. Also by the addition of PET percentage, the rutting resistance improves. Results indicated that utilization of ASAs, PET and Crumb Rubber (CR) enhance the Resilient Modulus (Mr), Indirect Tensile Strength (ITS), rutting resistance, fatigue life and Fracture Energy (FE) of asphalt mixtures. Also based on results, modification of binder by PET/CR with a ratio of 50%/50% and ASA (B) have the highest fatigue life which indicates that this mixture has highest resistance against fatigue cracking.

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Laboratory Investigation of Fatigue Characteristics of Asphalt Mixtures with Steel Slag Aggregates

Advances in Materials Science and Engineering ◽

10.1155/2015/623245 ◽

2015 ◽

Vol 2015 ◽

pp. 1-5 ◽

Cited By ~ 8

Author(s):

Hassan Ziari ◽

Shams Nowbakht ◽

Sajad Rezaei ◽

Arash Mahboob

Keyword(s):

Fatigue Life ◽

Resilient Modulus ◽

Steel Slag ◽

Engineering Properties ◽

Fine Aggregate ◽

Coarse Aggregates ◽

Fine Aggregates ◽

Indirect Tensile ◽

Fatigue Characteristics ◽

Marshall Stability

There are many steel-manufacturing factories in Iran. All of their byproducts, steel slag, are dumped randomly in open areas, causing many environmentally hazardous problems. This research is intended to study the effectiveness of using steel slag aggregate (SSA) in improving the engineering properties, especially fatigue life of Asphalt Concrete (AC) produced with steel slag. The research started by evaluating the physical properties of the steel slag aggregate. Then the 13 types of mixes which contain steel slag in portion of fine aggregates or in portion of coarse aggregates or in all portions of aggregates were tested. The effectiveness of the SSA was judged by the improvement in Marshall stability, indirect tensile strength, resilient modulus, and fatigue life of the AC samples. It was found that replacing the 50% of the limestone coarse or fine aggregate by SSA improved the mechanical properties of the AC mixes.

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Performance Evaluation of Wearing Course Asphalt Mixes Based on Resilient Modulus, Indirect Tensile Strength and Marshall Stability

International Journal of Pavement Research and Technology ◽

10.1007/s42947-021-00011-7 ◽

2021 ◽

Author(s):

Mohammad Nouman ◽

Zain Maqbool ◽

Sikander Ali ◽

Aleena Saleem

Keyword(s):

Tensile Strength ◽

Performance Evaluation ◽

Resilient Modulus ◽

Indirect Tensile Strength ◽

Asphalt Mixes ◽

Indirect Tensile ◽

Marshall Stability

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Indicadores do desempenho de misturas asfálticas determinados através do ensaio de compressão diametral

TRANSPORTES ◽

10.14295/transportes.v16i1.10 ◽

2008 ◽

Vol 16 (1) ◽

Author(s):

Lélio Antônio Teixeira Brito ◽

Jorge Augusto Pereira Ceratti ◽

Daniel Ramos Victorino

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Fatigue Life ◽

Cyclic Loading ◽

Tensile Test ◽

Resilient Modulus ◽

Phase Lag ◽

Asphalt Mixes ◽

Indirect Tensile Test ◽

Indirect Tensile

Os ensaios de compressão diametral são amplamente usados no Brasil para determinação das propriedades mecânicas de misturas asfálticas, tanto através de ensaios monotônicos para determinação da resistência à tração, quanto sob carregamentos cíclicos para determinação do módulo de resiliência e da vida de fadiga. Este trabalho teve como objetivo mostrar que com instrumentação adequada destes ensaios, indicadores adicionais àqueles usualmente determinados podem ser obtidos. A energia mobilizada durante o ensaio de resistência à tração, bem como o monitoramento da rigidez ao longo do ensaio de fadiga e a defasagem medida entre o pulso de carga e o deslocamento no ensaio de módulo de resiliência, mostram-se promissores para este propósito.Abstract Indirect tensile test (IDT) are broadly used in Brazil for the assessment of mechanical properties of asphalt mixes, not only under monotonic loading to determine the tensile strength, but also under cyclic loading to determine resilient modulus and fatigue life. This study tries to demonstrate that with adequate instrumentation of these tests, additional indicators to those usually determined are possible to be obtained. The mobilized energy during the IDT test, as well as the monitoring of the stiffness during the fatigue test and the phase lag measured between load and displacement pulses in the resilient modulus test are promising for this purpose.

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Effect of Sodium Chloride on the Modulus and Fatigue Life of Bituminous Mixtures

Materials ◽

10.3390/ma13092126 ◽

2020 ◽

Vol 13 (9) ◽

pp. 2126

Author(s):

Luis Juli-Gándara ◽

Ángel Vega-Zamanillo ◽

Miguel Ángel Calzada-Pérez ◽

Evelio Teijón-López-Zuazo

Keyword(s):

Fatigue Life ◽

Sodium Chloride ◽

Dynamic Modulus ◽

Hot Mix Asphalt ◽

Resilient Modulus ◽

Salt Water ◽

Decisive Role ◽

Bituminous Mixture ◽

Bituminous Mixtures ◽

Reference Mixture

Bituminous mixtures are not perfectly elastic materials, so their viscoelastic properties play a decisive role in knowing their behavior. This research aims to find out this behavior through the values of the resilient modulus, the dynamic modulus, and the fatigue life for asphalt concrete and porous mixtures when they are influenced by the presence of salt (NaCl, sodium chloride). The aforementioned influence of salt has been evaluated by utilizing three different methods: submerging specimens of bituminous mixture in salt water; introducing salt into the specimens as if it was aggregate and immersing the aggregate in salt water; and drying it and then manufacturing the bituminous mixture with it. As the results indicate, the mixtures submerged in salt water do not show large differences in comparison to the reference mixtures for hot mix asphalt and porous mixtures. However, for hot mix asphalt in which salt has been added as aggregate, the resilient modulus is greater than in the reference mixture. For the bituminous mixtures in which an aggregate saturated in salt water has been used for its manufacture, the results of the resilient modulus test, dynamic modulus test, and fatigue life test are lower than in the reference mixture, especially when the specimens are submerged.

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Fatigue Modeling and Numerical Analysis of Re-Filling Probe Hole of Friction Stir Spot Welded Joints in Aluminum Alloys

Materials ◽

10.3390/ma14092171 ◽

2021 ◽

Vol 14 (9) ◽

pp. 2171

Author(s):

Armin Yousefi ◽

Ahmad Serjouei ◽

Reza Hedayati ◽

Mahdi Bodaghi

Keyword(s):

Experimental Data ◽

Tensile Strength ◽

Fatigue Life ◽

Fatigue Strength ◽

Fatigue Behavior ◽

Element Model ◽

Plastic Strain Amplitude ◽

Friction Stir ◽

Probe Hole ◽

Good Agreement

In the present study, the fatigue behavior and tensile strength of A6061-T4 aluminum alloy, joined by friction stir spot welding (FSSW), are numerically investigated. The 3D finite element model (FEM) is used to analyze the FSSW joint by means of Abaqus software. The tensile strength is determined for FSSW joints with both a probe hole and a refilled probe hole. In order to calculate the fatigue life of FSSW joints, the hysteresis loop is first determined, and then the plastic strain amplitude is calculated. Finally, by using the Coffin-Manson equation, fatigue life is predicted. The results were verified against available experimental data from other literature, and a good agreement was observed between the FEM results and experimental data. The results showed that the joint’s tensile strength without a probe hole (refilled hole) is higher than the joint with a probe hole. Therefore, re-filling the probe hole is an effective method for structures jointed by FSSW subjected to a static load. The fatigue strength of the joint with a re-filled probe hole was nearly the same as the structure with a probe hole at low applied loads. Additionally, at a high applied load, the fatigue strength of joints with a refilled probe hole was slightly lower than the joint with a probe hole.

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Mechanical Behavior for some Cobalt Alloys

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1114.9 ◽

2015 ◽

Vol 1114 ◽

pp. 9-12

Author(s):

Alexandru Ghiban ◽

Brandusa Ghiban ◽

Cristina Maria Borţun ◽

Nicolae Serban ◽

Mihai Buzatu

Keyword(s):

Tensile Strength ◽

Chemical Composition ◽

Mechanical Behavior ◽

Mechanical Characteristics ◽

Fractographic Analysis ◽

Cobalt Alloys ◽

Dental Alloys ◽

Bending Tests ◽

Longitudinal Modulus

Four compositions of some usually commercial dental alloys were investigated in order to determine the mechanical characteristics and fractographic analysis of tensile and bending tests surfaces. A correlation between chemical composition (either molybdenum or molybdenum and chromium contents) and mechanical characteristics (longitudinal modulus, tensile strength and elongation) were finally done.

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Effect of Sugarcane Bagasse Ash as Filler in Hot Mix Asphalt

Materials Science Forum ◽

10.4028/www.scientific.net/msf.846.683 ◽

2016 ◽

Vol 846 ◽

pp. 683-689 ◽

Cited By ~ 6

Author(s):

M. Zulfikri M. Zainudin ◽

Faridah Hanim Khairuddin ◽

Choy Peng Ng ◽

Siti Khadijah Che Osmi ◽

N. Aina Misnon ◽

...

Keyword(s):

Sugarcane Bagasse ◽

Hot Mix Asphalt ◽

Resilient Modulus ◽

Public Works ◽

Laboratory Result ◽

Asphaltic Concrete ◽

Maintenance And Rehabilitation ◽

Experimental Laboratory ◽

Sugarcane Bagasse Ash ◽

Marshall Stability

Hot Mix Asphalt (HMA) is a combination of asphalt and aggregates that will give durable road surface for pavement and is widely used in Malaysia. However, due to damages caused by excessive traffic loadings, the HMA pavement normally required frequently maintenance and rehabilitation works. Therefore in recent years, research on modification of HMA has tremendously increased in highway construction field using natural sources and recycling products such as rubber, plastic, anti-stripping agents, waste materials and etc. This study was conducted to evaluate the effect of sugarcane bagasse ash (SCBA) used as filler in HMA. Experimental laboratory were done to compare the properties of normal HMA sample with modified HMA sample using SCBA. Result obtained for both sample were compared to Malaysian Public Works Department (MPWD) specification. The laboratory result reveals that SCBA are effective in increasing the Marshall stability, flow and Resilient Modulus of normal HMA. The SCBA increases Marshall stability by 0.6%, flow 4.9% and Resilient Modulus 17.4% respectively of ordinary HMA and all test and analysis parameters for asphaltic concrete of SCBA sample comply with MPWD requirements. Therefore, SCBA has potential in modifying normal HMA.

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Enhancing the tensile strength of SiC reinforced aluminium- based functionally graded structure through the mixture design approach

International Journal of Structural Integrity ◽

10.1108/ijsi-07-2021-0067 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

M. Poornesh ◽

Shreeranga Bhat ◽

E.V. Gijo ◽

Pavana Kumara Bellairu

Keyword(s):

Tensile Strength ◽

Composite Structure ◽

Centrifugal Casting ◽

Matrix Material ◽

Stir Casting ◽

Mixture Design ◽

Functionally Graded ◽

Content Type ◽

Functionally Graded Composite ◽

The Matrix

PurposeThis article aims to study the tensile properties of a functionally graded composite structure with Al–18wt%Si alloy as the matrix material and silicon carbide (SiC) particles as the reinforcing element. More specifically, the study's primary objective is to optimize the composition of the material elements using a robust statistical approach.Design/methodology/approachIn this research, the composite material is fabricated using a combination of stir casting and the centrifugal casting technique. Moreover, the test specimen required to study the tensile strength are prepared according to the ASTM (American Society for Testing and Materials) standards. Eventually, optimal composition to maximize the tensile property of the material is determined using the mixture design approach.FindingsThe investigation results imply that the addition of the SiC plays a crucial role in increasing the tensile strength of the composite. The optical microstructural images of the composite show the adequate distribution of the reinforcing particles with the matrix. The proposed regression model shows better predictability of tensile strength. In addition, the methodology aids in optimizing the mixture component values to maximize the tensile strength of the produced functionally graded composite structure.Originality/valueLittle work has been reported so far where a hypereutectic Al–Si alloy is considered the matrix material to produce the composite structure. The article attempts to make a composite structure by using a combination of stir casting and centrifugal casting. Furthermore, it employs the mixture design to optimize the composition and predict the model of the study, which is one of a kind in the field of material science.

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