Buy the best types of Asphalt Mixture at a cheap price
In this article, we intend to provide you with useful information about Asphalt Mixture Bamboo Binder and the Indoor Aging Test.
asphalt mixture components
The Marshall test, indoor aging test, uniaxial compression test, low-temperature bending test, immersion Marshall test, freeze-thaw splitting test, and four-point bending fatigue test are used to assess the durability of bamboo fiber asphalt mixture using four gradation schemes and asphalt binder, taking into account three different factors: aging durability, freeze-thaw cycle durability, and fatigue durability.
As control groups, non-fiber and lignin fiber asphalt mixtures were used.
The findings indicate that the durability of an asphalt mixture can be significantly increased by the inclusion of plant fiber.
Due to its rough surface and effective oil absorption, bamboo fiber-modified asphalt mastic has good ductility and adhesion.
Compared to lignin fiber asphalt mixture, bamboo fiber asphalt mixture has stronger and more consistent low-temperature aging durability and moisture aging durability, but it has poorer mechanical properties.
The improved effect of the two fibers on the asphalt mixture's resistance to freeze-thaw cycles is essentially the same.
Bamboo fiber can increase the mixture's flexibility and slow the occurrence of cracks, giving the mixture good fatigue resistance.
The durability increases with smaller void ratios, thicker asphalt films, and denser mixture structures.
The durability of the asphalt concrete (AC) gradation is inferior to that of the stone mastic asphalt (SMA) gradation mixture.
The endurance of the plant fiber asphalt mixture is greatly influenced by the material composition and aggregate gradation.
In order to achieve the directional management of the durability of various fiber asphalt mixtures, it will be necessary to build a multiparameter comprehensive evaluation index system among fiber type and qualities, mixture gradation, and durability.
Lignin fiber can be successfully replaced with bamboo fiber, and future work can be done to enhance its surface characteristics and dispersion uniformity.
Aging durability, freeze-thaw cycle durability, and fatigue durability are all factors in asphalt mixture durability.
Asphalt aging is a constant issue during the installation and usage of asphalt pavement, and it has a big impact on the service life of the pavement.
Aging can impair an asphalt pavement's performance, reduce its flexibility, cause pavement cracking, and ultimately exacerbate pavement damage.
Asphalt pavement can sustain severe freeze-thaw damage when low temperatures and moisture combine, leading to cracking, loosening, stripping, particle dropping, pumping, and other problems that will significantly reduce the asphalt pavement's durability.
Additionally, asphalt pavement is vulnerable to fatigue failure caused by repeated wheel loads.
This failure first appears as longitudinal fractures in the pavement before progressing to net cracks and even craters.
In addition to reducing the pavement's useful life and increasing operation and maintenance expenses, this will also decrease driving comfort.
Researchers observed that adding fiber stabilizers to the asphalt mixture can increase the pavement's fracture resistance, aging resistance, moisture damage resistance, and durability while also extending the pavement's service life.
asphalt road construction
It is a practical solution to asphalt pavement's performance issues [3, 4].
In asphalt mixtures nowadays, lignin fiber, mineral fiber, and polymer fiber are all often utilized; lignin fiber is the most common because of its excellent chemical stability, potent oil absorption capacity, and affordable pricing.
However, because lignin fibers are mostly extracted from logs, their widespread use does not adhere to the development idea of resource conservation, making them unsuitable for widespread use in the rapidly expanding road infrastructure.
Finding green and sustainable plant fibers to replace them is therefore crucial.
China lacks adequate forestry resources.
Per capita forest acreage and stock are much below the global norm.
On the other hand, China possesses the greatest global supply of bamboo resources.
Bamboo fiber offers strong, consistent physical and mechanical characteristics that show little change.
Bamboo fiber is the greatest substitute for lignin fiber for use on roads because it is also affordable, recyclable, biodegradable, and renewable.
Therefore, using quickly growing bamboo to replace conifer wood for lignin fibers used in roads can reduce the disparity between supply and demand for wood and achieve the sustainable development of forest resources.
It is also a necessary step in the development of the circular economy and the creation of a society that conserves resources and protects the environment.
The study of construction materials and road fiber durability has made significant strides.
Researchers Li et al.
and Panda et al.
discovered that the inclusion of coconut and maize straw fiber can significantly enhance the performance of asphalt mixtures on roads.
Short-cut basalt fiber can significantly increase the fatigue durability of asphalt mixture, as demonstrated by Chen et al.
Under salt freeze-thaw cycle conditions, Zhang et al.'s research on the durability of composite fiber modified asphalt mixture revealed that composite fiber made of polyester fiber, basalt fiber, and sepiolite fiber may considerably increase the durability of asphalt pavement.
Saeed et al.'s assessment of the aramid pulp fiber asphalt mixture's durability revealed that the inclusion of aramid pulp fiber significantly increased the asphalt mixture's fatigue life, thermal performance, and durability under repeated freeze-thaw cycles.
According to Khotbehsara et al., fly ash and flame retardant filler can increase the endurance of an epoxy resin system in hot and humid climates.
The test findings of Li et al.
demonstrated that employing nanocarbon material as filler can considerably increase the mechanical characteristics, crack resistance, and durability of good cement.
According to Sheng et al., the use of bamboo fiber can increase the asphalt mixture's low-temperature fracture resistance and rutting resistance, and bamboo fiber has a greater impact on these properties than polymer and lignin fiber.
According to Li, the use of bamboo fiber increased the asphalt concrete's high-temperature stability and low-temperature crack resistance.
It is clear that there are now very few studies on bamboo fiber asphalt mixtures, most of which concentrate on conventional road performance, and that there is still no research on durability.
Additionally, the quantitative examination of the elements influencing the durability of fiber asphalt mixture is insufficient, and the available literature on the subject is not systematic and thorough enough.
Asphalt Bamboo Mixture
In this work, flocculent bamboo fiber isolated from the bamboo stem was mixed with asphalt mixture and compared with non-fiber asphalt mixture and lignin fiber asphalt mixture in order to assess the durability of bamboo fiber asphalt combination.
The grey correlation theory was used to assess the elements impacting the durability of the asphalt mixture.
A series of laboratory tests were carried out to research the durability of bamboo fiber asphalt mixture from three angles of ageing durability, freeze-thaw cycle durability, and fatigue durability.
This in-depth investigation into the causes and processes by which plant fibers, such as bamboo, increase the strength of asphalt mixtures can not only serve as a design foundation for the engineering application of plant fiber asphalt mixtures, but also significantly enhance the road's performance, service life, and service level.
Lignin fiber and bamboo fiber, two types of plant fibers, were used to create the fiber-reinforced asphalt mixtures in this study.
The Marshall stability test findings were used to determine the quantities of both types of fiber in the asphalt mixture, which were set at 1.0 wt% in the asphalt mastic (detailed later).
The flocculent lignin fiber was provided by Galway Technology Co., Ltd.
(Sichuan, China), whereas the flocculent bamboo fiber was created in a laboratory by Homemade, Changsha, Hunan, China.
Digital pictures of the two fibers and micrographs taken using a scanning electron microscope (SEM, Quanta, Houston, TX, USA) can both be used to distinguish the two fibers’ minute differences.
The SEM micrographs show that lignin fibers, which typically have lengths of 4 to 10 mm, intertwine with prominent branches at the ends to cause lap bonding and improve the adhesion between asphalt and aggregate.
They also have smooth surfaces and relatively uniform diameters across single fibers, which range from 10 to 20 m.
Bamboo fibers, on the other hand, have diameters that are more variable across single fibers (usually 15 to 20 m) and include the existence of gullies on the fiber surface.
Bamboo fibers normally have lengths of 4 to 8 mm.
Plant fiber made up 0, 2, 3, 4, 5, and 6 weight percent of the total mass of the asphalt mixture, correspondingly.
Four gradations of the asphalt mixture were prepared as Marshall specimens in accordance with the test specification JTG E20-2011 (Marshall compactor, Tuoxing, Nanjing, Jiangsu, China).
The ideal fiber level was established in accordance with technological requirements.
Controlling aging duration and aging temperature allowed researchers to assess the thermal oxidative aging performance of fiber asphalt mixture (Oven, Quannai, Changzhou, Jiangsu, China).
Different asphalt mixtures were cooked and aged in ovens with forced ventilation.
The aging durations were 0, 30, 60, 90, and 120 hours while the test temperature was 80 °C.
The test temperatures were 80, 90, 100, 110, and 120 °C while the aging time was 120 hours.
To assess the mechanical characteristics of the asphalt mixture, tests were performed on its compressive strength and compressive resilient modulus before and after aging at 20 °C.
By using the static pressure approach, a 100 mm by 100 mm cylindrical specimen was created (Static pressure forming instrument, Taiding, Cangzhou, Hebei, China).
asphalt concrete vs asphalt
The test was conducted using an MTS-810 universal material testing equipment (MTS, Eden Prairie, MN, USA), with a loading rate of 2 mm/min.
The bending stiffness modulus and the maximum bending strain of the fiber asphalt mixture were evaluated at 10 °C; the trabecular bending test (Bending tester, Changji, Shanghai, China) was used to assess the low-temperature stability of the asphalt mixture before and after aging.
The sample was divided into 250 mm 30 mm 35 mm prismatic trabecular, and the loading speed was 50 mm per minute.
By using the immersion Marshall test (Marshall compactor, Tuoxing, Nanjing, Jiangsu, China) and the freeze-thaw splitting test (Splitting tester, Zhulong, Cangzhou, Hebei, China), as well as testing the immersion Marshall residual stability and freeze-thaw splitting strength of fiber asphalt mixture, the moisture stability of asphalt mixture before and after aging was assessed.
A freeze-thaw splitting test was used to assess the endurance of several freeze-thaw cycles.
The sample was frozen at 18 °C for 16 hours, and after that, it was placed in a thermostatic water tank (Jiangnan, Ningbo, Zhejiang, China) at 60 °C for 24 hours.
Each sample underwent 1, 2, 3, 4, and 5 cycles of freezing and thawing.
The splitting tensile strength was measured using an SYD-0731 uniaxial compression testing equipment (Meiyu, Shanghai, China) and the splitting tensile strength ratio was computed after all freeze-thaw cycle samples were placed in a constant temperature water tank at 25 °C for 2 hours.
The low-temperature aging durability and moisture aging durability of bamboo fiber asphalt mixture are better and more stable than those of lignin fiber asphalt mixture under various aging temperatures and times, but its mechanical properties are less than those of the latter.
The fiber in the asphalt mixture can improve compressive strength and reduce resilient deformation by spreading out the material's stress and preventing stress concentration.
Because bamboo fiber has a rough surface and excellent oil absorption capabilities, its modified asphalt mastic has strong ductility and adhesion.
asphalt concrete mix design pdf
Plant fiber can strengthen the asphalt mixture's structural integrity and reduce the impact of water erosion, increasing the asphalt mixture's resistance to freeze-thaw cycles.
Both bamboo and lignin fiber have similar improvements in the freeze-thaw cycle resistance of asphalt mixtures.
Bamboo fiber has a larger density and superior durability, which helps to increase the mixture's flexibility and postpone the onset of cracks.
Its improved asphalt blend provides good resistance to fatigue.
In general, the thicker the asphalt film, the denser the structure, and the better its durability, the smaller the void ratio of the fiber asphalt mixture.
The SMA gradation combination has greater durability than the AC gradation mixture.
The fiber asphalt mixture's durability is significantly influenced by the material composition and aggregate gradation.
To achieve the directional regulation of the durability of various fiber asphalt mixtures, it will be necessary to build a multiparameter comprehensive evaluation index system between fiber type and qualities, asphalt mixture gradation, and durability.
Bamboo fiber gives the asphalt mixture good durability, making it a competitive substitute for lignin fiber.
The surface microstructure and chemistry of bamboo fiber and its dispersion in asphalt mixture can be further altered or upgraded to realize its potential and facilitate future uses of asphalt pavements.
This study can establish the groundwork for the practical use of bamboo fiber, which is crucial for improving the resilience of asphalt pavement, lowering project costs, fostering China's sustainable development of transportation, and safeguarding the environment.
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