Evaluation of the Effect of Mixing Conditions of Micro-Silica Modified Asphalt Binder

Zghair, Hussein H.; Joni, Hasan H.; Hassan, Maan S.

doi:10.1088/1757-899x/518/2/022048

Cited by 8 publications

(6 citation statements)

References 16 publications

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“…This is consistent with the opinion of [ 33 , 35 ], which show that silica fume can significantly improve the permanent deformation resistance of asphalt. The main reason is that silica fume belongs to a group of inorganic materials with low thermal conductivity.…”

Section: Resultssupporting

confidence: 93%

Aging Resistance of Silica Fume/Styrene-Butadiene-Styrene Composite-Modified Asphalt

Zhu

2021

Materials

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The influences of silica fume content and aging on the rheological properties of silica fume/styrene-butadiene-styrene composite-modified asphalts were investigated via rolling thin-film oven test simulations. The asphalts rheological properties before and after aging were measured using three-major-indices, dynamic shear rheology, and bending beam rheometer tests. Fourier transform infrared spectroscopy was used to examine the changes in the functional groups of the asphalt. The silica fume did not chemically react with the modified asphalt, and its original structure was maintained. The aging resistance improved significantly after adding the silica fume. At 6% silica fume content, the relaxation of the asphalt was the highest, indicating that the asphalt had the best low-temperature crack resistance at this mixing proportion. Furthermore, the carbonyl index value of this sample exhibited the smallest increment among all of the samples, and this asphalt sample had the strongest short-term aging resistance. Thus, the optimum silica fume content in the composite-modified asphalt was determined to be 6%. This information may be used to fabricate an asphalt mixture that can improve the service life and aging resistance of pavements.

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Section: Resultssupporting

confidence: 93%

Aging Resistance of Silica Fume/Styrene-Butadiene-Styrene Composite-Modified Asphalt

Zhu

2021

Materials

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“…At the same time, research [ 10 ] also proposed that when the content of SF is more than 10%, the softening point will decrease, and it is recommended that the content of SF should not exceed 10%. In addition, Hussein H Zghair et al [ 18 ] also verifies that the micro-silica content of 6% has a good effect on improving the physical properties of asphalt. Therefore, combined with the previous research and the research in this paper, the silica fume (SF) content of 6% is recommended.…”

Section: Resultsmentioning

confidence: 95%

High and Low Temperature Performance and Fatigue Properties of Silica Fume/SBS Compound Modified Asphalt

Zheng

Huang

et al. 2020

Materials

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In order to study the high and low temperature properties, and fatigue properties, of silica fume/SBS (Styrene-Butadiene-Styrene) compound modified asphalt (SFSCMA), dynamic shear rheometer (DSR) and bending beam rheometer (BBR) are used to study matrix asphalt (MA), silica fume modified asphalt (SFMA) (silica fume (SF) 6%), SBS modified asphalt (SBSMA) (mass ratio of SBS to Matrix asphalt 4%), and silica fume/SBS compound modified asphalt, and the high temperature rheological properties of silica fume/SBS compound modified asphalt with different silica fume additions are also studied. The modification mechanism of SFSCMA was studied by scanning electron microscope (SEM). The investigation results turn out: along with the increase in the content of SF, the high temperature performance of SFSCMA is improved significantly. When the content of SF is 6%, the high temperature performance is the best. When the content of SF is more than 6%, the high temperature property of SFSCMA is lower than that of SBSMA. It is suggested to choose 6% as the content of SF. Compared with MA, SFMA, and SBSMA, SFSCMA has excellent high temperature performance; compared with MA and SFMA, the low temperature performance of SFSCMA is improved, but it is worse than that of SBSMA. Moreover, when the temperature is lower than −30 °C, its low temperature performance is close to that of MA, or even worse than that of MA. After the compound modification of SF and SBSMA, the fatigue properties of the asphalt are improved, and the fatigue performance of SFSCMA is the best among the four kinds of asphalt. There is a cross-linking force in the network structure of SFSCMA, which restrains the flow of the whole system, so that the stability of the compound modified asphalt is significantly improved, which is favorable to the high temperature performance and fatigue resistance of the compound modified asphalt. However, due to its low mobility, it has a negative impact on the low temperature performance of the compound modified asphalt. In addition, according to previous studies, compared with diatomite, it is proven that SF can reach the same level as diatomite in improving the high temperature performance and fatigue performance of asphalt. Therefore, SF can be used as a good choice of asphalt modifier and can achieve the purpose of waste recycling and environmental protection.

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“…Silica nanoparticles showed promising improvements when added into asphalt [ 28 , 29 , 30 , 31 , 32 ]. Karnati S. et al [ 31 ] chemically modified silica nanoparticles (SnPs) by (3-aminopropyl) triethoxysilane (APTES) and mixed with asphalt.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Evaluation of Mechanical Properties of Modified Asphalt and Mixture Using Graphene Platelets (GnPs)

et al. 2021

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Recently, nanomaterials have attracted attention in the field of pavement construction as modifiers to endure heavy loads and climate changes. In this study, conventional asphalt (bitumen) of penetration grade AC (60/70) was modified with graphene platelets (GnPs) at three different contents: 0.5%, 1.0%, and 1.5% by weight of asphalt content. Kinematic viscosity, softening point, penetration, and dynamic shear rheology tests were performed to evaluate the mechanical properties of modified binder. The results showed that adding GnPs improves the mechanical properties of asphalt binder; the kinematic viscosities, softening points, and rutting parameters increased but penetrations decreased with the contents of GnPs. Hot mix asphalt specimens with GnPs-modified asphalt were prepared and characterized with Marshall tests, thermal stress restrained specimen tests (TSRST), wheel tracking tests, and indirect tensile tests. Similar to the results of asphalt binder, the mechanical properties of asphalt mixture were improved by GnPs. Marshall stability increased by 21% and flow decreased by 24% with accepted value of 2.8 mm in penetration when the mixture was modified with 1.0 wt% of GnPs. At the same GnPs content, modified asphalt mixture led to lower failure temperature by 2 °C in comparison with unmodified asphalt mixture and the cryogenic failure stress was improved by 12%. The wheel tracking tests showed that GnPs-modified asphalt mixture has outstanding deformation resistance in comparison with unmodified asphalt mixtures: after 5000 cycles, 1.0 wt% of GnPs reduced the rut depth of asphalt mixture by 60%—the rut depth of unmodified asphalt mixture was 6.9 mm compared to 2.75 mm for modified asphalt mixture. After 10,000 cycles, the modified asphalt mixture showed rut depth of 3.24 mm in comparison with 8.12 mm in case of unmodified asphalt mixture. Addition of GnPs into asphalt mixture significantly improved the indirect tensile strength: 1.0 wt% of GnPs increased the indirect tensile strength of unmodified asphalt mixture from 0.79 to 1.1 MPa recording ~40% increment. The results of this study can confirm that graphene platelets enhance the mechanical properties of asphalt mixture and its performance.

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Evaluation of the Effect of Mixing Conditions of Micro-Silica Modified Asphalt Binder

Cited by 8 publications

References 16 publications

Aging Resistance of Silica Fume/Styrene-Butadiene-Styrene Composite-Modified Asphalt

Aging Resistance of Silica Fume/Styrene-Butadiene-Styrene Composite-Modified Asphalt

High and Low Temperature Performance and Fatigue Properties of Silica Fume/SBS Compound Modified Asphalt

Laboratory Evaluation of Mechanical Properties of Modified Asphalt and Mixture Using Graphene Platelets (GnPs)

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