Calculation derivation and test verification of indirect tensile strength of asphalt pavement interlayers at low temperatures

2021 ◽  
pp. 313-319
Author(s):  
Qian Zhang* ◽  
Zhihe Fang ◽  
Yiheng Xu ◽  
Zhao Ma
Keyword(s):  
Tensile Strength ◽  
Low Temperatures ◽  
Asphalt Pavement ◽  
Indirect Tensile Strength ◽  
Indirect Tensile ◽  
Test Verification

Research of Mechanical Properties of Asphalt Pavement Materials with WMA and RAP

2012 ◽  
Vol 204-208 ◽  
pp. 3934-3937 ◽  
Author(s):  
Bao Yang Yu ◽  
Yu Wang ◽  
Min Jiang Zhang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Dynamic Modulus ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Indirect Tensile Strength ◽  
Porous Asphalt ◽  
Compaction Energy ◽  
Indirect Tensile

The objectives of this paper are to characterize the mechanical properties of porous asphalt pavement mixtures containing RAP and a WMA additive using Super pave gyratory compactor and dynamic modulus testing. Four types of asphalt mixtures were evaluated in this study. This study evaluated compaction energy index, permeability, indirect tensile strength, and dynamic modulus for all types of porous asphalt mixtures. All of the asphalt mixtures meet the typical minimum coefficient of permeability in this study. In addition, only a slight decrease in was found when WMA additive was added to the porous asphalt mixture containing RAP. For indirect tensile strength testing, WMA containing RAP was found to have the highest tensile strength among all of the mixtures tested.

scholarly journals The effect of different deicing solutions on the moisture susceptibility of asphalt mixture

2021 ◽  
Vol 3 (6) ◽  
Author(s):  
Ali Abdi Kordani ◽  
Seyed Hani Seifi ◽  
Hossein Ghasemzadeh Tehrani ◽  
Bahram Shirini
Keyword(s):  
Tensile Strength ◽  
Sodium Chloride ◽  
Magnesium Chloride ◽  
Asphalt Pavement ◽  
Potassium Acetate ◽  
Indirect Tensile Strength ◽  
List Type ◽  
Moisture Susceptibility ◽  
Asphalt Mix ◽  
Indirect Tensile

Abstract The present research studies the effectiveness and efficiency of solutions such as sodium chloride, magnesium chloride and potassium acetate on asphalt pavement to reduce the damage caused by moisture on asphalt pavement in winter. To prevent the stripping problem in asphalt, Nano-Zycotherm with three quantities corresponding to 0.1%, 0.2% and 0.3% weight of bitumen is used in this study. Under the saturated condition with the above solutions, the indirect tensile test performs by applying a freeze–thaw cycle as a means to measure the amount of moisture susceptibility. The results indicate that the asphalt mix containing 0.3% Nano-Zycotherm has a higher indirect tensile strength and tensile strength ratio than asphalt mix containing 0.1% and 0.2% Nano-Zycotherm. Accordingly, Magnesium chloride solution is the most effective deicing material to improve the indirect tensile strength and durability of asphalt pavements when faced with moisture and ice. Article highlights The presence of Nano-Zycotherm in asphalt leads to its increased resistance against stripping. The use of Sodium chloride and potassium acetate deicing solutions causes some damages in asphalt. Considering different solutions, magnesium chloride has the best performance against asphalt stripping.

scholarly journals PENENTUAN KADAR AIR BAGI LAPIS PONDASI DAUR ULANG JALAN BERASPAL DENGAN FOAM BINTUMEN TERHADAP KUAT TARIK TAK LANGSUNG DAN KUAT TEAKAN BEBAS

Teknika ◽  
2017 ◽  
Vol 12 (2) ◽  
pp. 48
Author(s):  
Donny Ariawan ◽  
Slamet Budirahardjo ◽  
Ikhwanudin Ikhwanudin
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Asphalt Pavement ◽  
Green Technology ◽  
Indirect Tensile Strength ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Indirect Tensile

Jalan beraspal merupakan salah satu prasarana transportasi utama di Indonesia yang belum sepenuhnya mencapai kondisi yang aman dan nyaman dimana sering dijumpai kondisi permukaan jalan yang tidak rata, bergelombang dan berlubang yang menyebabkan ketidaknyamanan bagi penggunanya. Kegiatan perbaikan dan pemeliharaan struktur perkerasan jalan, dalam hal ini jalan beraspal, menjadi sangat penting untuk kelangsungan kegiatan transportasi. Pesatnya perkembangan teknologi di bidang transportasi telah melahirkan satu terobosan baru tentang teknologi penanganan kerusakan jalan yaitu dengan cara daur ulang lapis perkerasan aspal yang sudah ada. Metode daur ulang ini memiliki keuntungan antara lain dapat menghemat biaya, merupakan green technology, memiliki kualitas yang sama dengan material baru, dan menjaga geometris perkerasan karena tebal perkerasan yang sama. Penentuan kadar air terbaik dalam campuran foam bitumen terhadap nilai kuat tarik tak langsung (ITS) serta kuat tekan bebas (UCS) untuk campuran lapis pondasi daur ulang. Dilakukan secara bertahap, dari pengujian untuk bahan penyusun campuran yaitu agregat baru, Reclaimed Asphalt Pavement (RAP), filler, aspal, dan foam bitumen. Kemudian uji terhadap campuran padat meliputi Uji Marshall, Uji Indirect Tensile Strength (ITS) dan Uji Unconfined Compressive Strength (UCS). Kadar air dan kadar foam bitumen sangat berpengaruh terhadap kuat tarik tak langsung (Indirect Tensile Strength/ITS) serta kuat tekan bebas (Unconfined Compressive Strength/UCS) dari campuran dingin daur ulang dengan foam bitumen. Nilai ITS, TSR dan UCS yang dicapai menggunakan kadar foam 2% dan kadar air optimum terbaik yang diketahui dalam penelitian sebesar 100% terhadap Kadar Air Optimum (KAO) yaitu masing- masing 301,04 kPa, 76,36%, dan 723,49 kPa

scholarly journals Evaluation of Fatigue Potential for Crumb Rubber Modified Bitumen in Stone Mastic Asphalt Mixes

2021 ◽  
Vol 10 (3) ◽  
pp. 170-183
Author(s):  
Anusha T M ◽  
◽  
Sharath Kumar M D ◽  
Dr. H S Jagadeesh ◽  
◽  
...  
Keyword(s):  
Tensile Strength ◽  
Fatigue Test ◽  
Asphalt Pavement ◽  
Indirect Tensile Strength ◽  
Engine Oil ◽  
Reclaimed Asphalt Pavement ◽  
Test Results ◽  
Reclaimed Asphalt ◽  
Indirect Tensile ◽  
Marshall Stability

SMA is a gap graded mix composed of a high concentration of coarse aggregate that is held together in a thick asphalt film by a matrix of mineral filler and stabilizers. Since natural aggregates have become expensive, hence Reclaimed Asphalt Pavement (RAP) can be reused in pavement construction to reduce the environmental hazardous due to disposal problems. Since the RAP contains used aggregates, it is highly prone to fatigue, thermal and reflective cracking effect. Rheological and chemical properties of aged bitumen in RAP can be enhanced by use of untreated waste oils such as waste engine oil as rejuvenators. This research presents a study on fatigue performance of SMA mix with Reclaimed Asphalt Pavement (RAP) materials with and without rejuvenators and results were compared with conventional SMA mix. The materials used were first characterized by common laboratory tests. Then the three SMA mixes are tested using several laboratory test procedures: Marshall Stability, indirect tensile strength, moisture susceptibility, and indirect tension fatigue test. The optimum proportions of the of the mixes with highest stability are selected from the Marshall stability test. The indirect tensile strength test results show that the SMA mix replaced with RAP without rejuvenators showed higher tensile strength ratio and resistance to moisture damage when compared to conventional mix and optimum RAP replacement mix with rejuvenators. The fatigue test was conducted for the three optimum mixes at different temperature and stresses. The fatigue test results showed that at lower temperature and stresses, the RAP replaced SMA without rejuvenator offered better fatigue resistance than those with rejuvenator and conventional SMA mix. At higher temperatures, the RAP replaced SMA mix with rejuvenator offered similar fatigue lifecycle as conventional mix. However, at high stresses, conventional SMA mix offered better fatigue lifecycle. Increase in failure stresses resulted in decrease of number of fatigue cycles and increased in initial tensile strain of the mix. Thus, with the use of RAP substantial decrease in cost can be achieved without compromising the fatigue characteristic of the SMA mix.

scholarly journals Calculation Derivation and Test Verification of Indirect Tensile Strength of Asphalt Pavement Interlayers at Low Temperatures

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6041
Author(s):  
Qian Zhang ◽  
Zhihe Fang ◽  
Yiheng Xu ◽  
Zhao Ma
Keyword(s):  
Tensile Strength ◽  
Tensile Test ◽  
Asphalt Pavement ◽  
Indirect Tensile Strength ◽  
Elastic Theory ◽  
Calculation Formula ◽  
Indirect Tensile Test ◽  
Indirect Tensile ◽  
Direct Tensile ◽  
Direct Tensile Test

When the direct tensile test is adopted to determine the interlayer tensile strength of the asphalt pavements, specimen separation or internal cracking often occurs at the bonding area of the loading head, rather than at the interlaminar bonding interface. In view of the tedious and discrete data of the direct tensile test, this paper attempts to introduce an indirect tensile test to determine the interlayer bond strength of asphalt pavement to solve this problem. However, the indirect tensile test method of a binder lacks the corresponding mechanical theory. This paper deduces the calculation formula of the indirect tensile strength of a binder based on elastic theory. A mechanical model of the test was established with the finite element method. In accordance with the two-dimensional elastic theory and the Flamant solution, an analytical solution of tensile stress in the indirect tensile test is proposed through the stress superposition. On this basis, the calculation formula for the indirect tensile strength of the interlaminar bonding is derived according to Tresca’s law. A low-temperature indirect tensile test was designed and conducted to verify the correctness of the formula. By comparing the results of the indirect tensile test and direct tensile test, it is found that the interlaminar strength of the mixture measured by them is similar, and the dispersion of indirect tensile test results is small. The results show that the indirect tensile test can replace the direct tensile test to evaluate the interlaminar tensile strength.

scholarly journals Effects of Additive Materials on Indirect Tensile Strength and Moisture Sensitivity of Recycled Asphalt Pavement (RAP)

2019 ◽  
Vol 4 (2) ◽  
pp. 69-79 ◽  
Author(s):  
Soz Mohammed Ebrahim ◽  
Hardy Kamal Karim
Keyword(s):  
Tensile Strength ◽  
Asphalt Pavement ◽  
Asphalt Binder ◽  
Road Construction ◽  
Crumb Rubber ◽  
Indirect Tensile Strength ◽  
Moisture Sensitivity ◽  
Reclaimed Asphalt ◽  
Indirect Tensile ◽  
Additive Materials

Using reclaimed asphalt pavement with additives as part of new road construction has economic and environmental advantages. As an attempt to preserve aggregate resources and save money, and knowing the effects of the selected additive materials, this study was done in Sulaimani City. The samples of the RAP were selected from the Sulaimani municipality stockpiles. The ignition and centrifuge testing machines were used to separate the aggregate and binder of the RAP. Based on the standard deviation of the obtained asphalt content, the blend was decided to be 40% RAP and 60% new material. The aggregate tests were conducted to evaluate the characteristics of the PAR aggregate. The performance grade test was done for the reclaimed asphalt binder. Three types of additives, which were Styrene Butadiene-Styrene (SBS), Crumb Rubber (CR), and Polypropylene (PP), mixed with the reclaimed asphalt binder with three different percentages of the binder which were 3%, 5%, and 7%. Indirect Tensile Strength (ITS) test was performed to the conditioned and unconditioned mixtures. To evaluate the effects of additives on the moisture sensitivity of the reclaimed mixtures, ITS Ratios were obtained. Most of the percentages of additives decreased the ITS of the conditioned and unconditioned samples. The only percentage of the additive material increased the ITS was 5% of PP in conditioned case. However, additives did not benefit the ITS, they benefited the ITSR greatly. The best obtained ITSR for each additive material was 7% SBS, 3% CR, and 5% PP that had 99.71%, 97.1%, and 90.7%, respectively.

scholarly journals Rejuvenation Mechanism of Asphalt Mixtures Modified with Crumb Rubber

CivilEng ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 370-384
Author(s):  
Hossein Noorvand ◽  
Kamil Kaloush ◽  
Jose Medina ◽  
Shane Underwood
Keyword(s):  
Tensile Strength ◽  
Dynamic Loading ◽  
Creep Compliance ◽  
Asphalt Mixture ◽  
Crumb Rubber ◽  
Indirect Tensile Strength ◽  
Laboratory Evaluation ◽  
Strength Testing ◽  
Noise Mitigation ◽  
Indirect Tensile

Asphalt aging is one of the main factors causing asphalt pavements deterioration. Previous studies reported on some aging benefits of asphalt rubber mixtures through laboratory evaluation. A field observation of various pavement sections of crumb rubber modified asphalt friction courses (ARFC) in the Phoenix, Arizona area indicated an interesting pattern of transverse/reflective cracking. These ARFC courses were placed several years ago on existing jointed plain concrete pavements for highway noise mitigation. Over the years, the shoulders had very noticeable and extensive cracking over the joints; however, the driving lanes of the pavement showed less cracking formation in severity and extent. The issue with this phenomenon is that widely adopted theories that stem from continuum mechanics of materials and layered mechanics of pavement systems cannot directly explain this phenomenon. One hypothesis could be that traffic loads continually manipulate the pavement over time, which causes some maltenes (oils and resins) compounds absorbed in the crumb rubber particles to migrate out leading to rejuvenation of the mastic in the asphalt mixture. To investigate the validity of such a hypothesis, an experimental laboratory testing was undertaken to condition samples with and without dynamic loads at high temperatures. This was followed by creep compliance and indirect tensile strength testing. The results showed the higher creep for samples aged with dynamic loading compared to those aged without loading. Higher creep compliance was attributed to higher flexibility of samples due to the rejuvenation of the maltenes. This was also supported by the higher fracture energy results obtained for samples conditioned with dynamic loading from indirect tensile strength testing.

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