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Effect of different high viscosity modifiers on rheological properties of high viscosity asphalt

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Frontiers of Structural and Civil Engineering 2021年第6期15卷 1390-1399页

作者： Peipei KONG Gang XU Xianhua CHEN Xiangdong SHI Jie ZHOU School of Transportation Southeast UniversityNanjing 211189China National Demonstration Center for Experimental Road and Traffic Engineering Education Nanjing 211189China

High viscosity asphalt(HVA)has been a great success as a drainage pavement ***,the larger porosity of drainage asphalt mixtures weakens the cohesion and adhesion and leads to premature rutting,water damage,spalling and *** purpose of this study was to investigate the rheological properties of HVA prepared using different high viscosity modifiers through conventional tests,Brookfield viscosity tests,dynamic shear rheometer tests and bending beam rheometer *** conventional performance results demonstrated SBS+rubber asphalt(SRA1/2)exhibited excellent elastic recovery and low-temperature *** 60℃ dynamic viscosity results indicated TPS+rubber asphalt(TRA)had the excellent *** rotational viscosity results and rheological results indicated that SRA-2 not only exhibited excellent temperature stability and workability,as well as excellent resistance to deformation and rutting resistance,but also exhibited excellent low-temperature cracking resistance and relaxation *** on rheological results,the PG classification of HVA was 16%rubber+asphalt for PG76-22,20%rubber+asphalt for PG88-22,TRA and SRA-1/2 for *** comprehensive evaluation of the viscosity,temperature stability and sensitivity,as well as high/low temperature performance of HVA,SRA-2 was found to be more suited to the requirements of drainage asphalt pavement materials.

关键词： high viscosity asphalt rheological properties rubber modifier viscosity

Crystallization,Mechanical,Thermal and rheological properties of Polypropylene Composites Reinforced by Magnesium Oxysulfate Whisker

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Chinese Journal of Polymer Science 2017年第5期35卷 659-671页

作者： Li Dang Xue-ying Nai Xin Liu Dong-hai Zhu Ya-ping Dong 李武 Key Laboratory of Salt Lake Resources Chemistry Qinghai Institute of Salt LakesChinese Academy of Sciences Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences University of Chinese Academy of Sciences

Polypropylene （PP） composites containing magnesium oxysulfate whisker （MOSw） or lauric acid （LA） modified MOSw （LAMOSw） were prepared via melt mixing in a torque rheometer. The heterogeneous nucleating effect of LAMOSw was clearly observed in polarized light microscopy （PLM） pictures with the presence of an abundance of small spherulites. MOSw exhibited no nucleation effect and formed a few spherulites with large size. Compared with PP/MOSw composites, PP/LAMOSw exhibited better impact strength, tensile strength and nominal strain at break, ascribing to three possible reasons：（i） more β-crystal PP formed, （ii） better dispersity of LAMOSw in PP matrix and （iii） the plasticizing effect of LA. The results of dynamic mechanical thermal analysis （DMTA） indicated that brittleness of the PP matrix at low temperature was improved by the addition of LAMOSw, while the interracial interactions between MOSw and PP matrix were actually weakened by LA, as evidenced by the higher tan8 values over the entire range of test temperatures. In terms of the rheological properties of the composites, both the η＊ and G＇ at low frequencies increase with the addition of MOSw or LAMOSw, indicating that the PP matrix was transformed from liquid-like to solid-like. However, a network of whiskers did not form because no plateau was found in the G＇ at low frequencies. With low filler content, LAMOSw produced a stronger solid-like behavior than MOSw mainly due to the better dispersion of the LAMOSw in PP matrix. However, for highly-filled composites, the η＊ of PP/LAMOSw at low frequencies was smaller than that of PP/MOSw composite, since the particle- particle contact effect played a major role.

关键词： PP/MOSw composites Crystallization Thermal properties Mechanical properties rheological properties

The Influence of Peroxide on Bubble Stability and rheological properties of Biobased Poly(lactic acid)/Natural Rubber Blown Films

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Chinese Journal of Polymer Science 2022年第2期40卷 197-207页

作者： Peerapong Chanthot Noppadon Kerddonfag Cattaleeya Pattamaprom Research Unit in Polymer Rheology and Processing Department of Chemical EngineeringFaculty of EngineeringThammasat UniversityPathum Thani 12120Thailand National Metal and Materials Technology Center National Science and Technology Development AgencyThailand Science ParkPathum Thani 12120Thailand

This study investigated the effects of natural rubber(NR)and an organic peroxide on the rheological properties,mechanical properties,morphology,and bubble stability during film blowing of poly(lactic acid)(PLA).The NR and peroxide contents were varied from 0 wt%to 25 wt%and 0 wt%to 0.5 wt%,*** results confirmed that the presence of well-dispersed NR could significantly improve the toughness,elongation at break,and processability of PLA films,where the optimal amount of NR was 15 wt%.For the reactive blending with peroxide,a suitable peroxide content for good film toughness and clarity was 0.03 wt%,while the higher content of 0.1 wt%could provide slightly higher *** contents are considered much lower than that in the PLA system(without NR),which required up to 0.5 wt%*** rheological studies indicated that the melt strength,the storage modulus(G’)and complex viscosity(η*)at low frequency could be correlated with good film blowing processability of the PLA/NR films at low gel *** parameters failed to correlate in the films having high gel contents as the deformation rate experienced by each test was different leading to the different levels of response to the type and amount of gels.

关键词： Poly(lactic acid) Natural rubber Film blowing stability Peroxide rheological properties

Aging effects on rheological properties of high viscosity modified asphalt

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Journal of Traffic and Transportation Engineering(English Edition) 2023年第2期10卷 304-319页

作者： Wei Jiang Dongdong Yuan Zheng Tong Aimin Sha Jingjing Xiao Meng Jia Wanli Ye Wentong Wang Key Laboratory for Special Area Highway Engineering of Ministry of Education Chang'an UniversityXi'an 710064China School of Highway Chang'an UniversityXi'an 710064China School of Civil Engineering Chang'an UniversityXi'an 710064China

This work investigated the aging effects on the rheological properties of high viscosity modified asphalt(HVMA).First,the high-and low-temperature rheological properties were measured by a dynamic shear rheometer and a bending beam rheometer,*** aging mechanism was then tested using an Fourier transform infrared spectroscopy and a scanning electron ***,a study was performed to compare the aging effects on the rheological properties of HVMA,crumb rubber modified asphalt(CRMA),and neat asphalt(SK-90).The experimental results showed that the effects of the long-term aging on HVMA exceeded those of short-term *** complex shear modulus of the HVMA was improved by the aging in the whole frequency *** complex shear modulus of the HVMA after the long-term aging was larger than after the short-term ***,the aging improved the high-temperature viscoelastic performance of *** a decrease in temperature from-12℃to-24℃,the low-temperature viscoelastic performance of HVMA decreased since its stiffness modulus and low continuous grading temperature *** of the short-and long-term aging of HVMA were caused by an oxidation reaction,while modifier swelling also happened after long-term *** to CRMA and SK-90,aging had a limited influence on the high-and low-temperature rheological properties of HVMA.

关键词： High viscosity modified asphalt rheological properties High-temperature Low-temperature Aging mechanism

Influence of Carboxyl Groups on the Particle Size and rheological properties of Polyacrylate Latices

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Journal of Wuhan University of Technology(Materials Science) 2010年第3期25卷 492-498页

作者：张心亚 School of Chemistry and Chemical Engineering South China University of Technology

The PAL was synthesized with BA,MMA and some monomers containing carboxyl groups（for example,acrylic acid（AA） and methacrylic acid（MAA）） as co-monomers by semi-continuous seeded emulsion polymerization *** influences of alkalinization temperature,the feeding manner of AA or MAA on the particles size,rheological properties and carboxyl distribution of the latex were discussed,and the rheological mechanism was *** experimental results show that the PAL system has preferable viscosity and particle size when the alkalinization temperature is 50 ℃.Different distribution of carboxyl group in the particles and different resultant rheological properties are obtained by different feeding manner of AA or MAA into the *** TEM images show that the particle is a smooth globe with carboxyl group concentrating on the surface and stabilized with electric double layer and nonionic adsorbed *** concentration of carboxyl functional group on the surface of particles can be achieved by the specific polymerization *** rheologyical properties are determined by accretion of particle volume and variation of the two phase volume ratio resulted from the carboxyl group spreading layer.

关键词： polyacrylate latices acrylic acid methacrylic acid rheological properties

The rheological properties of Ultra-fine High Performance Grouting Cement

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Journal of Wuhan University of Technology(Materials Science) 2001年第4期16卷 48-52页

作者：管学茂 School of Materials Science and Eng. Wuhan University of Technology Wuhan 430070 China

The material properties of surface and powder, rheological property, and mineral composition were investigated by means of SEM, XRD, Malvern laser granulometer and rotary, viscometer. The influence of a admixture on ultra-fine cement rheological properties and its mechanism, were studied in material theories. The results show that the ultra-fine fly ash has a higher zeta potential, and improves flowability of ultra-fine cement paste, decreases flowability loss as time prolonging, improves compatibility between superplasticizers and cement because of the electrostatic repulsion, ball bearing effect, filling and dispersing effect of admixtures and delay-releasing effect of superplasticizers.

关键词： high performance grouting cement ultra-fine grouting cement rheological properties

Mechanical and rheological properties of Bamboo Pulp Fiber Reinforced High Density Polyethylene Composites:Influence of Nano CaCO_(3)Treatment and Manufacturing Process with Different Pressure Ratings

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Journal of Renewable Materials 2022年第7期10卷 1829-1844页

作者： Cuicui Wang Xin Wei Lee MSmith Ge Wang Shuangbao Zhang Haitao Cheng International Centre for Bamboo and Rattan Beijing100102China Department of Mechanical and Energy Engineering University of North TexasDenton76203USA Beijing Key Laboratory of Wood Science&Engineering College of Material Science&TechnologyBeijing Forestry UniversityBeijing100083China

In order to investigate the effect of the relative motion of nano CaCO_(3)reinforced bamboo pulp fiber(BPF)/HDPE composite components on the mechanical performance,a comparative study was *** was treated by nano CaCO_(3)blending(BM)and impregnation modification(IM)*** composites were produced using hot press(HPMP),extrusion(EMP)and injection molding process(IMP).The physical morphology of BPF was similar at different manufacturing *** to the samples manufactured by HPMP,a decrease in the(specific)flexural strength of BPF/HDPE composites and an increase in those of composites treated by nano CaCO_(3)manufactured by EMP and IMP were *** injection molded composites exhibited the best values in the(specific)impact strength,(specific)tensile *** had a greater effect on the rheological behavior of the composites than BM,and nano CaCO_(3)treatment most effectively affected the performance of the extrusion molded composites.

关键词： Nano CaCO_(3) bamboo pulp fiber composites manufacturing process mechanical properties rheological properties

Effect of Thermal History on rheological properties of Partially Hydrolyzed Polyacrylamide/Anionic Surfactant SDS Complex Systems

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Chinese Chemical Letters 2002年第5期13卷 456-459页

作者： Hual Tian BU Zhen Zhong YANG Li HUANG Statc Key Laboratory of Polymer Physics and Chemistry Center for Molecular ScienceInstiturc of ChcmnistryChunese Acadcmy of SciencesBeijing 100080 Daqing Exploralion and Development Rescarch Institutc Daqing 163712

The effects of thermal history on the rheological properties of partially hydrolyzed polyacrylamide/ sodium dodecyl sulfate complex aqueous solutions have been studied using both steady shear and dynamic temperature sweep characterizations. An abnormal rheological behavior was found that dynamic moduli of the aqueous solutions increased, while the viscosity decreased after thermal treatment, which could help to gain insight into the micro-phase evolution of the polymer/surfactant complex aqueous solutions and its dependence on temperature.

关键词： Partially hydrolyzed polyacrylamide rheological properties Sodium dodecyl sulfate Supramolecular structure Thermal history

Effect of Ultraviolet Aging on Asphalt rheological properties

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China Petroleum Processing & Petrochemical Technology 2013年第4期15卷 26-32页

作者： Wang Jiani Xue Zhongjun Tan Yiqiu Zhang Lei School of Civil Engineering Beijing Jiaotong University Beijing Major Projects Construction Headquarters Office School of Communications Science & Engineering Harbin Institute of Technology Beijing Road Engineering Quality Supervision Station

This paper simulated the ultraviolet aging process of asphalt and used dynamic mechanic analysis （DMA） method to evaluate the effect of ultraviolet aging on the asphalt theological properties. After having experienced ultravio- let aging, the low temperature performance of asphalt binder decreased significantly, with its complex modulus increased and phase angle decreased along with changing rheological properties as compared to the performance of original asphalt binder. The ultraviolet aging process would make asphalt binder more sensitive to brittle and fatigue failure. On the basis of the time-temperature superposition principle （TTSP）, the viscoelastic transition frequency （coT） is proposed to evaluate the effect of ultraviolet aging. It is found that with the increase in ultraviolet aging time, the cox moves to the lower frequency range gradually. Since the viscoelastic transition frequency is sensitive to the effect of aging, it can be used as an indicator of ultraviolet aging.

关键词： asphalt ultraviolet aging rheological properties viscoelastic transition frequency