Low Temperature Anti-cracking Performance Research Articles

Analysis of Low Temperature Anti-Cracking Property of Epoxy Materials for Cable Intermediate Joints

In this paper, multi-channel strain sensors are used to in-situ monitor the changes of strain with temperature under low temperatures for different stress angles in epoxy cladded metal inserts and the low temperature anti-cracking performances of the epoxy materials used for cable intermediate joint were analyzed. Compared with the foreign epoxy EP-0, the self-prepared toughed epoxy EP-1 has higher tensile strength, larger elongation at break and smaller modulus, showing a stronger toughness. The glass transition temperature of EP-0 and EP-1 epoxy materials are approximately the same. Besides, although the epoxy cladded metal inserts for EP-0 and EP-1 were both uncracked and intact when the temperature decreased from 0 to -70 °C, the strain and the stress at the stress angle R2 of EP-0 increased more rapidly with the decrease of the temperature than that of EP-1, which can be inferred that the cracking temperature of EP-0 is lower than that of EP-1. Thus, the low-temperature anti-cracking performance of self-made toughed epoxy material is better than that of commonly used foreign epoxy material.

Effects of Filler-Asphalt Ratio on the Properties of Lignin and Polyester Fiber Reinforced SMPU/SBS Modified Asphalt Mortar

To understand the effects of filler-asphalt ratio on different properties of lignin and polyester fiber reinforced shape memory polyurethane (SMPU)/styrene butadiene styrene (SBS) composite modified asphalt mortar (PSAM), as well as to reveal the reinforcing and toughening mechanisms of lignin and polyester fibers on PSAM, SMPU, SBS and mineral powder were first utilized to prepare PSAM. Then the conventional, rheological and anticracking properties of lignin fiber reinforced PSAM (LFAM) and polyester fiber reinforced PSAM (PFAM) at different filler-asphalt ratios were characterized. Test results indicate that the shear strength, deformation resistance and viscosity are increased after adding 0.8wt% lignin fiber or polyester fiber and increasing the filler-asphalt ratio from 0.8 to 1.2. The optimal filler-asphalt ratio of 1.0 is proposed after comprehensive performance assessments of PSAM. Polyester fiber shows a better reinforcing effect than lignin fiber, but its improvement in the thermal stability of PSAM is not significant at high temperatures. Additionally, the complex modulus, storage modulus, loss modulus and rutting resistance factor of PSAM are improved after adding lignin fiber and polyester fiber, as well as show an increasing trend as the filler-asphalt ratio is raised, but the phase angle is gradually decreased. Further, the increase of elastic components in PSAM effectively enhances the anti-deformation ability of PSAM at high temperatures, and polyester fiber more obviously improves the high-temperature deformation resistance of PSAM than lignin fiber. Finally, the anti-cracking performance of PFAM and LFAM at low temperatures is reduced by 74.2% and 46.7%, respectively, as the filler-asphalt ratio is raised from 0.8 to 1.2. The low-temperature anti-cracking performance of LFAM is lower than that of PFAM at the same filler-asphalt ratio, even lower than that of PSA. Compared with lignin fiber, the anti-cracking performance and deformation resistance of PSAM at low temperature is more greatly enhanced by polyester fiber.

Laboratory investigation on added-value application of the COVID-19 disposable mask in hot mix asphalt (HMA)

The outbreak of the COVID-19 pandemic has stimulated the demand for disposable masks to an unprecedented level, which also poses a significant risk to the natural environment from the improper treatment or disposal of waste masks. To lower such an environmental risk and maximize the added value of the waste masks, this paper proposed to recycle the waste mask fiber (MF) in combination with the waste cooking oil (WCO) for hot mix asphalt (HMA) application. A series of MF + WCO modified asphalt binders were first designed and fabricated. Their performance properties were then systematically measured. The physical-rheological test results showed that the incorporation of MF can significantly improve the high-temperature rutting resistance performance of asphalt binder. However, it may also lower the asphalt's low-temperature anti-cracking performance. The addition of WCO was found to compensate for this low-temperature performance loss effectively, and the MF5% + WCO3% was identified as the best combination. The Fourier transform infrared (FTIR) spectroscopy test results revealed that the asphalt modified by the MF + WCO involved only a physical modification. The performance test results indicated that the high-temperature permanent deformation resistance and low-temperature anti-cracking of MF5% + WCO3% modified HMA was greatly enhanced, while its moisture stability was slightly reduced but still met the specification requirement. The environmental benefit assessments proved that recycling the waste masks for asphalt paving can provide an enormous added value to pavement engineering in terms of carbon emission reduction and land resource saving.

Preparation and characterization of low flammable asphalt for tunnel pavements

In this study, a silane modified flame retardant blend named FRB-SC was developed to combat combustion risks faced in tunnel asphalts. FRB-SC is a composite flame retardant principally made up of four components: Expandable Graphite (EG), Magnesium Hydroxide (MH), Calcium Hydroxide (CH) and Ammonium Polyphosphate (APP). The orthogonal design and the technique for order of preference by similarity to ideal solution were used to determine the optimal dosages of these four components. KH550 silane coupling agent was then added to modify the composite flame retardant and improve its functionality and stability in asphalt. Subsequently, the basic performance, rheological properties and flame retardancy of modified asphalts containing various dosages of FRB-SC (i.e., 2, 4, 6, 8, 10 and 12%) were evaluated, and thus the optimum dosage of FRB-SC was determined. The results showed that the asphalt's limiting oxygen index increased to 24.7% with the addition of 8% FRB-SC. Also, after the addition of FRB-SC, the asphalt's penetration and ductility decreased, its softening point increased, its high temperature stability increased, and its low temperature anti-cracking performance decreased. Meanwhile, based on the oil absorption and activation index of the FRB-SC, the optimal dosages of EG, MH, CH and APP were found to be 5%, 5%, 4%, and 9% by mass, respectively, and that of the silane coupling agent determined as 1.2%. Finally, the cone calorimeter test conducted on FRB-SC modified asphalt showed that carbon monoxide emissions were significantly reduced when combustion occurred, and the amount of heat and smoke released were also noticeably decreased, establishing the flame retardant efficacy of the FRB-SC. Now, although this study’s findings have not been applied in actual tunnel mixtures, this however provides an insight to the feasibility of its use for tunnel asphalt pavements, a move which could significantly reduce the hazards of tunnel fires and accidents.

Effect of PAN fiber with bionic layered surface structure generated in situ by Fenton reaction on performance of SBS/RP asphalt binder

• Innovative application of Fenton reaction in the modification of polyacrylonitrile fibers. • Biomimetic multi-layered structure modified polyacrylonitrile fibers. • KF-PAN/SBS/RP modified asphalt had better viscoelastic performance. • KF-PAN/SBS/RP modified asphalt had better low temperature anti-cracking performance, high temperature stability and fatigue damage resistance. • KF-PAN/SBS/RP modified asphalt had better rutting resistance and high temperature adhesion performance. In this study, a surface modified polyacrylonitrile fiber (KF-PAN) with a fish-scale whisker-like biomimetic hierarchical structure was successfully prepared via in situ competition effect of Fenton reaction. The modified fibers were used as secondary modifiers to prepare fiber-reinforced styrene–butadienestyrene (SBS) block copolymers and rubber powder (RP) modified asphalt binders (KF-PAN/SBS/RP). Energy dispersive spectroscopy, scanning electron microscopy, and atomic force microscopy analyses revealed the successful construction of bionic hierarchy on the fiber surface, and confirmed rough surface of the KF-PAN fibers. The hierarchical structure of the fiber surface acted as a buffer in the asphalt and strengthened the mutual interaction of the fiber and asphalt. Dynamic rheometer shear and strip-tensile tests showed that the KF-PAN/SBS/RP modified asphalt exhibited better viscoelasticity, rutting resistance, and tensile properties than the PAN/SBS/RP modified asphalt. The linear amplitude sweep test showed that KF-PAN/SBS/RP modified asphalt had better fatigue resistance. Thermogravimetric analysis tests indicated that the surface bionic structure of KF-PAN fibers boosted thermal stability of the fibers, which in turn enhanced the thermal stability of KF-PAN/SBS/RP modified asphalt. Fluorescence microscopy analysis showed that incorporating KF-PAN fibers improved the SBS and RP microstructure inside the asphalt, forming a good mesh structure, and alleviating the stress concentration phenomenon in SBS/RP asphalt under external traffic load.

Laboratory Investigation of PPG-TDI Polyurethane–Modified Asphalt Binders and Mixtures

Considering the defects of insufficient low-temperature flexibility and high cost of epoxy asphalt binder, low-cost polypropylene glycol (PPG) and toluene diisocyanate (TDI) were used to synthesize two polyurethane (PU) prepolymers (PTPU) with different isocyanate group (─ NCO) contents, and the properties of PTPU-modified asphalt binders and mixtures were studied. First, the mixing parameters of the PTPU-modified asphalt binders were determined through tests, and its storage stability, high- and low-temperature creep characteristics were studied. Then the microscopic modification mechanism of PTPU-modified asphalt binders was explored. Finally, the PTPU-modified asphalt binders were used to prepare mixtures, and the application performance in bridge deck pavement was evaluated. The results showed that PTPU-modified asphalt binder has satisfactory storage stability and high- and low-temperature performance. Chemical reactions occur during the modification process which change the micromorphology of the asphalt binder, and its high-and low-temperature performance and the adhesion to the aggregates are improved. The increase of -NCO content improves the high-temperature stability and mechanical strength of the PTPU-modified asphalt binder but reduces the flexibility. Hence, the ─ NCO content in PTPU can be adjusted according to actual needs during application. The PTPU-modified asphalt mixture has a good comprehensive performance, its low-temperature anticracking performance is improved greatly compared with that of epoxy asphalt mixture, and the lower price gives it good promotion and application prospects in engineering applications.

Evaluation on long-term performance of emulsified asphalt cold recycled mixture incorporating fly ash by mechanistic and microscopic characterization

In this paper, the long-term performance of emulsified asphalt cold recycled mixture (CRME) incorporating fly ash was investigated. The dosages of fly ash included 0.75%, 1.5% and 3.0%, and the long-term service conditions of CRME were simulated by curing in an oven at 60 °C for different ages. Mechanical performance of CRME under different curing ages were obtained through indirect tensile strength (ITS), Marshall stability, low-temperature ITS and freeze-thaw ITS tests, and the microstructures were characterized by optical microscope, X-ray diffraction (XRD) and environmental scanning electron microscopy (ESEM) tests. The results show that, as the curing age increases, the ITS, flow value, and low-temperature indirect tensile strain of CRME with fly ash increase first and then decrease, while the Marshall stability and freeze–thaw ITS ratio (TSR) always show a gradual increase trend. By comparing the CRME with cement, the CRME with fly ash throughout the long-term curing process exhibits the higher ITS and low-temperature anti-cracking performance and the lower high-temperature stability and water stability. Optical microscope, XRD and ESEM analysis indicate that the dissolution of fly ash particles and the demulsification of asphalt emulsion particles occur simultaneously during the curing ages. After a certain curing age, a dense structure composed of asphalt binders, dissolved and undissolved fly ash particles is formed. Also, the fly ash replacing cement in CRME can effectively reduce the energy consumption and carbon emission.

Laboratory Evaluation on the Road Performance of Diatomite Modified Porous Asphalt Mixture

Porous asphalt mixture (PAM) is an indispensable pavement material for the construction of sponge city with low-cost and environment friendly characteristics, which conducive to replenishing urban groundwater and alleviating the heat island effect. The main purpose of this article is to explore the change of road performance and water permeability of PAM under different diatomite dosage, and determine the optimal amount of diatomite content. First, the volume characteristics of diatomite permeable asphalt mixture (D-PAM) were measured by Darcy’s law, the void of D-PAM decreased slightly according to the test results. Furthermore, based on the water damage Marshall test and freeze-thaw splitting test, the water stability of D-PAM increases significantly with the increase of diatomite content. At last, the low-temperature anti-cracking performance and ductility of D-PAM were carried out based on the acoustic emission (AE) detector and the Low temperature universal mechanics testing machine. According to the experimental results, it is recommended that the content of diatomite is 10%.

Design and Performance Investigation of Drainage Ultra-Thin Wearing Course Based on Diatomite-Supported Epoxy-Modified Asphalt Mixture

Abstract The high-performance epoxy resin–modified asphalt has been widely applied in the development of steel deck pavement and roads with heavy traffic. However, the poor compatibility between the epoxy resin and matrix asphalt has never been solved completely. In this study, epoxy resin was supported on diatomite with a large pore structure, so that epoxy resin was evenly dispersed into asphalt for improving the compatibility. The diatomite-supported epoxy-modified asphalt (DEA) binder was prepared and applied to the drainage ultra-thin wearing course mixture (DUWM). Six different DEA-DUWM were designed with a 2.36-mm sieve size, which was the key sieve size. The general asphalt content was calculated by the asphalt film thickness test. The optimal asphalt content was determined by the Cantabro test and the Schellenberg binder drainage test. The best curing time was determined by the Marshall test. Taking the Japanese epoxy resin–modified asphalt (TAF) as the comparison group, the high-temperature rutting test, low-temperature bending beam test, immersion Marshall test, freeze-thaw splitting test, immersion Cantabro test, water seepage test, surface friction coefficient test, and Manual sand laying test were carried out for DEA-DUWM and TAF-DUWM under the same gradations and test conditions. The results indicate that DEA-DUWM has excellent high-temperature rutting resistance; the maximum low-temperature bending strain is nearly 25 % less than that of TAF-DUWM, but the low-temperature cracking resistance can still meet the specification requirements of China. The addition of diatomite and the air void of the mixture have an effect on the low-temperature anticracking performance of DUWM, and DEA-DUWM has a remarkable high-temperature and low-temperature moisture resistance, drainage, and skid resistance. The air void of the mixture has a great influence on the freeze-thaw resistance of DUWM. The asphalt type has a marginal effect on the drainage and antiskid properties. It is suggested that the DUWM design’s target air void content should not be less than 17 %, and it can be improved properly in an area with heavy rainfall.

Improved discrete element numerical simulation and experiment on low-temperature anti-cracking performance of asphalt mixture based on PFC2D

To study the cracking law of asphalt mixtures at low temperature, an improved mesoscopic model of an asphalt mixture Marshall split specimen and three-point trabecular bending specimen were established based on the discrete element method using PFC2D. Secondly, by defining and assigning the bonding constitutive model between different particles in the asphalt mixture, the numerical simulation results of AC-13 and AC-16 continuous, dense-graded asphalt mixtures’ splitting and three-point beam bending at −10 °C were analyzed. The experiment verified that the reliability of the numerical model described herein improved. The results showed that the two-dimensional model of an asphalt mixture based on the discrete element method can simulate the splitting and three-point beam bending test of asphalt mixtures with different gradations. Contact fracture between aggregate and asphalt mortar is the principal reason that an asphalt mixture cracks. Further, the contact between the aggregates contributes the most to the asphalt mixture’s splitting strength, and the contact between the asphalt mortar and the asphalt mortar and the aggregate contributes more than 85% to the asphalt mixture’s flexural tensile strength. In addition, the asphalt mixture’s splitting strength and flexural tensile strength increased as the maximum nominal particle size in the asphalt mixture gradation increased. Therefore, the results of this study can provide a theoretical basis for the design of asphalt pavement materials.

Asphalt Mixture Proportion Design Method of Coarse Graded High-Modulus Asphalt Concrete with Skeleton-Embedded Structure

In view of heavy traffic situation of asphalt pavement and the project needs in China, a kind of mixdesign method of coarse graded high modulus asphalt concrete(HMAC25)with skeleton embedded structurewas proposed. A kind of low labeled hard asphalt with penetration degree of 30(0.1 mm)(AH-30)wasused as the cementing material of high modulus asphalt concrete, and the nominal maximum aggregate size isno smaller than 26.5 mm. The asphalt-aggregate ratio of the asphalt mixture was determined by using thedesign method of asphalt mixture based on aggregate closest compact condition. The result of laboratory testindicates that(1)compared with the required value in the related specification, the high temperaturestability of high modulus asphalt concrete made with the proposed method improved by more than 7 times; (2)compared with the maximum value recommended in the related specification, the compression resilientmodulus at 20℃ increased by nearly 30%;(3)the low temperature anti-cracking performance and moisturestability can also meet the requirements of the specification.

Research on Low Temperature Performance of Emulsified Asphalt Cold Recycled Mixture and Improvement Measures Based on Fracture Energy.

At present, there are no specific indicators and requirements for the low-temperature crack resistance of emulsified asphalt cold recycled mixture (CRME) in the Chinese road mixture specifications. In order to expand the application of this technology in the asphalt surface layer in cold areas, this paper studied the influence of 10 influencing factors on the low-temperature anti-cracking performance of CRME through the semicircular bending test (SCB) with fracture energy as the evaluation index. The research results show that the fracture energy index of the SCB test can be used to evaluate the low temperature crack resistance of CRME. After 10 kinds of influencing factors were analyzed, it was found that the biggest factor affecting the low-temperature cracking resistance of the mixture was the recycling agent, which had an effect on the fracture energy index of over 60%. Followed by cement, fiber and compaction work, the degree of influence exceeded 30%. Finally, combined with engineering application experience, some specific measures to improve the low-temperature anti-cracking performance of CRME were proposed.

Study on the performance of the investigation and repair material of asphalt pavement crack diseases

Rutting and cracks are the main diseases of asphalt pavement at home and abroad. Based on the investigation of a highway, the author studies the degree of cracks on the highway and the main causes. According to the characteristics of pavement diseases, the corresponding treatment measures are put forward. Through laboratory tests, it is determined that the fibre repairing materials have a good effect on improving the low temperature anti cracking performance of asphalt mixture, and can be preferentially considered as pavement repairing materials.

Low-temperature performance of SBS modified asphalt mixture in high altitude and cold regions

Due to the severe natural environment found in high-altitude and cold regions, where the altitude is around 4000 m, and the average annual temperature is below 0°C, the design method and quality indicators of asphalt mixture performance is different in comparison to inland cities. To optimize design parameters and low-temperature performance of SBS modified asphalt mixture in high-altitude and cold regions, the beam bending, splitting, aging, and freez-thaw cycle tests were conducted based on the test protocol, field experience and quantitative analysis. Standard mixing procedures and evaluation indexes for low temperature anti-cracking performance were used to reveal the low temperature decaying characteristics of SBS modified asphalt mixtures. The results show that the optimum binder-aggregate ratio of 5.3% and the optimum SBS modifier dosage of 4%∼5% are recommended for SBS modified asphalt mixture in the high altitude and cold regions of the Tibetan Plateau. The splitting test is suitable for assessing low-temperature performance of asphalt mixtures in high altitude and cold regions with a loading rate adjusted to 2 mm/min. When the loading rate is adjusted to 10 mm/min, the beam bending test is suitable for studying the low-temperature performance of asphalt mixtures after long-term aging in high altitude and cold regions. The freezing and thawing split test is suitable for assessing low-temperature performance of asphalt mixtures after freezing and thawing in high altitude and cold regions when the loading rate is adjusted to 2 mm/min. Under long-term aging conditions, as temperature increases (−15°C∼0°C), the decay rate of maximum flexural-tensile strain of traditional asphalt mixture is bigger than that of SBS modified asphalt mixture. Having endured freezing and thawing cycles, the splitting strength and the maximum flexural-tensile strain of asphalt mixtures decreases. After 40 cycles of freezing and thawing, the maximum flexural-tensile strain decreases by 15.2% in comparison to state.

Properties of Printer Waste Toner Modified Bitumen

For the deficiency of the existing technology of petroleum bitumen, the printer (copier) waste toner (PWT) as the major additive, a proper amount of aluminate coupling agent and stearic acid synergist as the auxiliary additive were added to the base bitumen. A new kind of modified bitumen was developed and prepared. In order to evaluate the technical performance of the PWT modified bitumen and the bituminous mixtures, especially assess the high temperature performance, we compared the softening point and PG grade of Qilu 70# base bitumen and the PWT modified bitumen, and compared the Marshall test and rutting test results of the PWT modified bituminous mixtures and Qilu 70# bituminous mixtures. The results show that the PWT can improve the softening point of base bitumen about 3°C-8 ℃, accordingly, not only improve the high temperature stability of bituminous mixtures, reduce rutting, but also maintain the low temperature anti-cracking performance of bitumen and bituminous mixtures and show the good social, economic and environmental protection benefits. This technology overcomes the technical problem, the low temperature performance is sorry to be reduced when the high temperature performance is improved, which is posed by only adding the PWT to the base bitumen.

Investigation of the properties of asphalt mixtures incorporating reclaimed SBS modified asphalt pavement

With the increasing environmental considerations and rising costs of construction materials, reclaimed asphalt pavement (RAP) has been frequently added into asphalt paving mixtures during pavement construction. Many studies have been conducted with regard to the study of reclaimed unmodified asphalt pavement, but the reclaimed SBS modified asphalt pavement is still unknown. In this study, the effects of RAP and rejuvenating agent on the performance were studied. The moisture susceptibility, rutting resistance, dynamic modulus, low temperature anti cracking performance and fatigue was tested. Furthermore, in order to better understand the effects of RAP and rejuvenating agent, the control asphalt mixture was measured using the same methods. The results indicated that the asphalt mixture incorporating reclaimed SBS modified asphalt pavement with better moisture susceptibility, rutting resistance, dynamic modulus, low temperature anti cracking performance and fatigue resistance was obtained by blending new SBS modified asphalt binder and rejuvenating agent. Thus, the rejuvenating agent will benefit the effort of preparing more sustainable asphalt pavement containing RAP.

Characterization of Low Temperature Crack Resistance of Crumb Rubber Modified Asphalt Mixtures Using Semi-Circular Bending Tests

AbstractThe objective of this study was to assess the low temperature anti-cracking performance of crumb rubber modified asphalt mixtures by performing the semi-circular bending tests. The flexural tensile strength, fracture energy density, and fracture resistance were used to evaluate the rubber modified asphalt mixture's performance based on fracture mechanics J-integral concept. The semi-circular bending (SCB) tests were conducted to study the effect of crumb rubber dosage, crumb rubber size, and testing temperature on the low temperature anti-cracking performance of rubber modified asphalt mixtures. Two gradations (a dense gradation mixture and a gap-gradation mixture) were selected, and five rubber application dosages (15, 18, 20, 22, and 25 %, all by the weight of base binder) were studied in the paper. The tests were performed at temperatures of 0, −10, and −20°C. The testing results indicated that the flexural tensile strength and fracture energy density increased initially, reached to a peak point and then decreased with the increase of rubber dosage. Flexural tensile strength and fracture energy density reached its maximum value at the 20 % rubber dosage among the five rubber application dosages. The flexural tensile strength, fracture energy density, and the J-integral fracture toughness of the gap-graded rubber asphalt mixture specimens were higher than those of the dense gradation. The smaller sized particle rubber modified mixture provided a better low temperature anti-cracking performance as compared to those with bigger particle sizes. Through the comprehensive consideration of laboratory test results and field results, it was recommended that the J-integral fracture toughness should be no less than 2.8 KJ/m2 for new asphalt rubber pavement in Shannxi province.

Effect of Warm Mix Addictive EC120 on Asphalt Performance

In order to study the effect of warm mix addictive EC120 on asphalt performance, tests on asphalt density, penetration degree, softening point and ductility were carried out through adding various contents of EC120 to 70# paving asphalt (A grade) and SBS I-D polymer modified asphalt. The results indicate that when adding 3% content of EC120, the modification effect for these two kinds of asphalts is the best. The penetration degree of 70# paving asphalt decreases greatly than that for SBS polymer modified asphalt, but softening point increases small. The warm mix agent EC120 can improve the high-temperature stability and low-temperature anti cracking performance of asphalt. It has wide application prospect.

Natural Mineral Fiber Improved Asphalt Mixture Performance

Natural mineral fiber with good performances of mechanical properties and environmentally friendly, pollution-free especially have gradually aroused extensive concern. In order to improve the quality of asphalt pavement, explore the applicability of nature basalt fiber in enhanced asphalt mixture performance, this paper investigates two typical asphalt mixtures and contrastive studies pavement performance of asphalt mixture by high temperature stability, water stability, low temperature anti-cracking and fatigue performance between basalt fiber modified asphalt mixture and base asphalt mixture, and then study the basic principle of fiber reinforcing asphalt mixture. The research show that basalt fiber modified asphalt mixture has a better pavement performance than base asphalt mixture, its dynamic stability is 1.6 times than base asphalt mixture, low temperature anti-cracking performance increased by more 25% and fatigue life is more 2 times than base asphalt mixture. And the basalt fiber can be used in the road engineering as an additive material that enhances the comprehensive performance of asphalt pavement.

Analysis on the Impact of the Type and Content of SBS on the Performance of the Modified Asphalt Mixture

The types and contents of styrene-butadiene-styrene (SBS) modifier are two important factors of SBS modified asphalt mixtures. Nowadays, SBS are extensively utilized to modified asphalt in order to improve the performance of the flexible pavement. The objective of this study is to determine a best selection of types and contents of SBS modifier, which can improve high-temperature stability; low-temperature anti-cracking performance and moisture susceptibility of SBS modified asphalt mixture. The mixtures with four types of SBS (Linear A, Linear B, Star A, Star B) and the different contents of each type SBS including Linear SBS of 0%, 3%, 4%, 4.5% and Star SBS of 0%, 3%, 3.5%, 4%, were evaluated for the pavement performance of them under laboratory conditions. Wheel tracking test, beam bending test and freeze-thaw tensile strength test were chosen and carried out to determine high-temperature stability, low-temperature anti-cracking performance and the moisture susceptibility respectively. The laboratory testing results indicate that Star SBS show the more effective effects than Linear SBS to improve the high-temperature stability, low-temperature anti-cracking performance and moisture susceptibility of SBS modified asphalt mixture, and the optimum content of SBS can also play a key role the improvement of the pavement performance.