The Experts below are selected from a list of 76080 Experts worldwide ranked by ideXlab platform
Feng Zhang - One of the best experts on this subject based on the ideXlab platform.
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the research for sbs and sbr compound modified Asphalts with polyphosphoric acid and sulfur
Construction and Building Materials, 2013Co-Authors: Feng ZhangAbstract:Styrene-butadiene-styrene block copolymer (SBS)-and styrene-butadiene rubber (SBR)-compound modified Asphalts with good storage stability and high- or low-temperature properties before and after short- and long-term ageing are prepared by the addition of polyphosphoric acid or sulfur selectively. The effect of PPA and sulfur on the storage stability, the physical and rheological properties of SBS- and SBR-modified Asphalts before and after ageing is studied. To improve the storage stability, high- or low-temperature properties of SBS- and SBR-modified Asphalts before and after ageing, the SBR-modified Asphalt should be modified further only by the addition of PPA, the linelike SBS-modified Asphalt should be improved by the addition of PPA and sulfur, the starlike SBS-modified Asphalt should be improved only by the addition of sulfur. The modification mechanism of PPA and sulfur in the preparation of those polymer modified Asphalts (PMAs) is studied further.
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effects of thermal oxidative ageing on dynamic viscosity tg dtg dta and ftir of sbs and sbs sulfur modified Asphalts
Construction and Building Materials, 2011Co-Authors: Feng Zhang, Jun HanAbstract:Abstract Thermal oxidative ageing as an inevitable process in the practical application of road Asphalt has a great effect on the properties of polymer-modified Asphalts (PMAs). In this article, the influences of short-term and long-term thermal oxidative ageing on the dynamic viscosity, thermal stabilities, and infrared spectra of styrene–butadiene–styrene (SBS)- and storage-stable SBS/sulfur-modified Asphalts were studied respectively. Although the addition of sulfur improved the dynamic viscosity and the thermal stability of SBS-modified Asphalt significantly due to the formation of a chemically crosslinked polymer network structure, the improved properties declined evidently after ageing and the losses of properties became very severe with the ageing aggravated and the binder with sulfur showed a visible viscous behaviour compare with the corresponding binder without sulfur after ageing due to the severe degradation of vulcanized SBS, therefore SBS/sulfur-modified Asphalt was more susceptible to ageing. Besides, the SBS structure also had a great effect on the properties of binders before and after ageing. In infrared spectra analysis, the structural evolutions of binder under different ageing modes were characterized by using right ageing index and the conclusions of thermal analysis and dynamic viscosity tests were confirmed further by the changes of butadiene and carbonyl indexes.
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effect of ageing on rheological properties of storage stable sbs sulfur modified Asphalts
Journal of Hazardous Materials, 2010Co-Authors: Feng ZhangAbstract:Oxidative ageing as an inevitable process in practical road paving has a great effect on the properties of polymer-modified Asphalts (PMAs). In this article, the effect of short-term and long-term oxidative ageing on the rheological, physical properties and the morphology of the styrene-butadiene-styrene (SBS)- and storage-stable SBS/sulfur-modified Asphalts was studied, respectively. The analysis on the rheological and physical properties of the PMAs before and after ageing showed the two major effects of ageing. On one hand, ageing prompted the degradation of polymer and increased the viscous behaviour of the modified binders, on the other, ageing changed the Asphalt compositions and improved the elastic behaviour of the modified binders. The final performance of the aged binders depended on the combined effect. After ageing, the storage-stable SBS/sulfur-modified Asphalts showed an obvious viscous behaviour compare with the SBS-modified Asphalts and this led to an improved low-temperature creep property. The rutting resistance of the SBS-modified Asphalts declined by the addition of sulfur due to the structural instability of the SBS/sulfur-modified Asphalts. The rheological properties of the modified binders before and after ageing also depended strongly on the structural characteristics of SBS. The observation by using optical microscopy showed the compatibility between Asphalt and SBS was improved with further ageing, especially for the storage-stable SBS/sulfur-modified Asphalts.
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the research for high performance sbr compound modified Asphalt
Construction and Building Materials, 2010Co-Authors: Feng ZhangAbstract:Abstract The high-performance SBR compound modified Asphalt can be made with the addition of polyphosphoric acid (PPA), styrene–butadiene rubber (SBR) and sulfur. The effects of PPA, SBR, sulfur on the physical properties, the dynamic rheological properties, the high-temperature storage stabilities, the morphologies and the internal structures of Asphalts were studied, respectively. The high-temperature storage stability of SBR-modified Asphalt can be improved significantly with the addition of PPA and sulfur by the gelation effect and the dynamical vulcanization. The addition of SBR to the pure PPA modified Asphalt improved the low-temperature physical properties with unfavourable effects on the resistance to rutting. The addition of sulfur to the PPA/SBR-modified Asphalt improved the rheological properties and the adhesion of modified binders to stone matrix. The optimal proportion of PPA, SBR, sulfur can improve the properties of Asphalt roundly.
Yinxi Zhang - One of the best experts on this subject based on the ideXlab platform.
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pyrolyzed wax from recycled cross linked polyethylene as warm mix Asphalt wma additive for sbs modified Asphalt
Construction and Building Materials, 2011Co-Authors: Lina Shang, Shifeng Wang, Yong Zhang, Yinxi ZhangAbstract:Abstract Recycled polyethylene wax is a kind of pyrolyzed wax obtained from the recycled polyethylene. Effects of recycled pyrolytic cross-linked polyethylene wax (RPPW) on the properties of base Asphalt and SBS modified Asphalt were investigated. The effects of RPPW and Sasobit wax on the Asphalt performance, structure and thermal behavior were also compared. RPPW showed superior viscosity decreasing effect on SBS modified Asphalt at high-temperature. Addition of RPPW reduced penetration, increased softening point and penetration index of both base Asphalt and SBS modified Asphalt. Addition of RPPW also increased the complex modulus and decreased the phase angle of base Asphalt and SBS modified Asphalt. The results show that Asphalts modified by RPPW have promised remarkable construction performance at lower temperature for warm mix Asphalt. Therefore, this study represents a novel attempt to deal with the rapid growth of cross-linked polyethylene, which is very significant from an environmental and economic standpoint.
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thermo rheological properties and storage stability of sebs kaolinite clay compound modified Asphalts
European Polymer Journal, 2006Co-Authors: Chunfa Ouyang, Shifeng Wang, Yong Zhang, Yinxi ZhangAbstract:Abstract Styrene–ethylene–butadiene–styrene block copolymer (SEBS) modified Asphalts with improved high-temperature storage stability are prepared by incorporating kaolinite clay (KC) into the SEBS compounds. The effect of KC on the high-temperature storage properties, dynamic rheological and mechanical properties and morphologies of the modified Asphalts are studied. It is found that the SEBS/KC ratio in the compound has a great effect on the high-temperature storage behavior. The modified Asphalts are stable when the ratio of SEBS/KC is around 2. However, KC decreases the dynamic rheological and mechanical properties of the modified Asphalts to some extent. The high-temperature storage property can be increased by improving the compatibility and decreasing the density difference between SEBS and Asphalt.
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preparation and properties of styrene butadiene styrene copolymer kaolinite clay compound and Asphalt modified with the compound
Polymer Degradation and Stability, 2005Co-Authors: Chunfa Ouyang, Shifeng Wang, Yong Zhang, Yinxi ZhangAbstract:Abstract Styrene–butadiene–styrene copolymer (SBS)/kaolinite clay (KC) compounds were prepared using a mixing technique. The effects of SBS/KC ratio and mixing temperature on the mechanical properties of the compounds and the distribution of molecular weight of SBS were investigated. The compounds were successfully used to improve the high-temperature storage stability of Asphalts as compared with pure SBS modified Asphalts. The improvement in high-temperature storage stability could be attributed to the KC in the SBS/KC compounds for it decreased the difference of densities between SBS and Asphalt. The effects of KC on the high-temperature storage properties, mechanical properties, dynamic mechanical properties, and morphologies of SBS/KC modified Asphalts were studied. The SBS/KC ratio in the compounds had a great effect on the high-temperature storage stability. The modified Asphalts were very stable at high temperature when the SBS/KC ratio was around 3. The maximum KC content in the modified Asphalts was 2%, and the KC content had slight influence on the mechanical properties of the modified Asphalts. The KC could improve the rheological properties of the modified Asphalt to some extent.
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rheological characterization of storage stable sbs modified Asphalts
Polymer Testing, 2002Co-Authors: Guian Wen, Yong Zhang, Yinxi Zhang, Kang Sun, Yongzhong FanAbstract:Abstract The high-temperature storage stability of styrene–butadiene–styrene triblock copolymer (SBS) modified Asphalt can be improved significantly with the addition of elemental sulfur. The dynamic mechanical properties of SBS-modified Asphalts before and after adding sulfur were characterized by using dynamic shear rheometry. The addition of sulfur to SBS modified Asphalt resulted in the formation of a chemically vulcanized SBS network structure in the modified binders, and the high temperature performance of the binders was improved and their temperature susceptibility was reduced to a great extent. The SBS content has a great effect on the rheological properties of the Asphalts. The rheological properties of SBS modified Asphalts depended strongly on the sulfur level. Increasing sulfur levels led to increasing crosslinking density in the modified binders, and consequently the rheological properties of SBS-modified Asphalt was improved. A comparison was made among the properties of the Asphalts modified by three different SBS structures. The SBS structure affected the compatibility and storage stability of SBS-modified Asphalts, which were improved by the addition of sulfur. As determined by a rotational viscometer, the increase in Asphalt viscosity is not directly proportional to the SBS content before and after adding sulfur. The morphology of SBS-modified Asphalts, which was characterized by optical microscopy, showed that the compatibility and storage stability of SBS modified Asphalt were improved by the addition of sulfur.
Yong Zhang - One of the best experts on this subject based on the ideXlab platform.
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pyrolyzed wax from recycled cross linked polyethylene as warm mix Asphalt wma additive for sbs modified Asphalt
Construction and Building Materials, 2011Co-Authors: Lina Shang, Shifeng Wang, Yong Zhang, Yinxi ZhangAbstract:Abstract Recycled polyethylene wax is a kind of pyrolyzed wax obtained from the recycled polyethylene. Effects of recycled pyrolytic cross-linked polyethylene wax (RPPW) on the properties of base Asphalt and SBS modified Asphalt were investigated. The effects of RPPW and Sasobit wax on the Asphalt performance, structure and thermal behavior were also compared. RPPW showed superior viscosity decreasing effect on SBS modified Asphalt at high-temperature. Addition of RPPW reduced penetration, increased softening point and penetration index of both base Asphalt and SBS modified Asphalt. Addition of RPPW also increased the complex modulus and decreased the phase angle of base Asphalt and SBS modified Asphalt. The results show that Asphalts modified by RPPW have promised remarkable construction performance at lower temperature for warm mix Asphalt. Therefore, this study represents a novel attempt to deal with the rapid growth of cross-linked polyethylene, which is very significant from an environmental and economic standpoint.
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thermo rheological properties and storage stability of sebs kaolinite clay compound modified Asphalts
European Polymer Journal, 2006Co-Authors: Chunfa Ouyang, Shifeng Wang, Yong Zhang, Yinxi ZhangAbstract:Abstract Styrene–ethylene–butadiene–styrene block copolymer (SEBS) modified Asphalts with improved high-temperature storage stability are prepared by incorporating kaolinite clay (KC) into the SEBS compounds. The effect of KC on the high-temperature storage properties, dynamic rheological and mechanical properties and morphologies of the modified Asphalts are studied. It is found that the SEBS/KC ratio in the compound has a great effect on the high-temperature storage behavior. The modified Asphalts are stable when the ratio of SEBS/KC is around 2. However, KC decreases the dynamic rheological and mechanical properties of the modified Asphalts to some extent. The high-temperature storage property can be increased by improving the compatibility and decreasing the density difference between SEBS and Asphalt.
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preparation and properties of styrene butadiene styrene copolymer kaolinite clay compound and Asphalt modified with the compound
Polymer Degradation and Stability, 2005Co-Authors: Chunfa Ouyang, Shifeng Wang, Yong Zhang, Yinxi ZhangAbstract:Abstract Styrene–butadiene–styrene copolymer (SBS)/kaolinite clay (KC) compounds were prepared using a mixing technique. The effects of SBS/KC ratio and mixing temperature on the mechanical properties of the compounds and the distribution of molecular weight of SBS were investigated. The compounds were successfully used to improve the high-temperature storage stability of Asphalts as compared with pure SBS modified Asphalts. The improvement in high-temperature storage stability could be attributed to the KC in the SBS/KC compounds for it decreased the difference of densities between SBS and Asphalt. The effects of KC on the high-temperature storage properties, mechanical properties, dynamic mechanical properties, and morphologies of SBS/KC modified Asphalts were studied. The SBS/KC ratio in the compounds had a great effect on the high-temperature storage stability. The modified Asphalts were very stable at high temperature when the SBS/KC ratio was around 3. The maximum KC content in the modified Asphalts was 2%, and the KC content had slight influence on the mechanical properties of the modified Asphalts. The KC could improve the rheological properties of the modified Asphalt to some extent.
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rheological characterization of storage stable sbs modified Asphalts
Polymer Testing, 2002Co-Authors: Guian Wen, Yong Zhang, Yinxi Zhang, Kang Sun, Yongzhong FanAbstract:Abstract The high-temperature storage stability of styrene–butadiene–styrene triblock copolymer (SBS) modified Asphalt can be improved significantly with the addition of elemental sulfur. The dynamic mechanical properties of SBS-modified Asphalts before and after adding sulfur were characterized by using dynamic shear rheometry. The addition of sulfur to SBS modified Asphalt resulted in the formation of a chemically vulcanized SBS network structure in the modified binders, and the high temperature performance of the binders was improved and their temperature susceptibility was reduced to a great extent. The SBS content has a great effect on the rheological properties of the Asphalts. The rheological properties of SBS modified Asphalts depended strongly on the sulfur level. Increasing sulfur levels led to increasing crosslinking density in the modified binders, and consequently the rheological properties of SBS-modified Asphalt was improved. A comparison was made among the properties of the Asphalts modified by three different SBS structures. The SBS structure affected the compatibility and storage stability of SBS-modified Asphalts, which were improved by the addition of sulfur. As determined by a rotational viscometer, the increase in Asphalt viscosity is not directly proportional to the SBS content before and after adding sulfur. The morphology of SBS-modified Asphalts, which was characterized by optical microscopy, showed that the compatibility and storage stability of SBS modified Asphalt were improved by the addition of sulfur.
Chunfa Ouyang - One of the best experts on this subject based on the ideXlab platform.
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evaluation of ethylene acrylic acid copolymer eaa modified Asphalt fundamental investigations on mechanical and rheological properties
Construction and Building Materials, 2015Co-Authors: Chunfa Ouyang, Ye Yuan, Qun Gao, Kangsheng Zheng, Jun YanAbstract:Abstract Asphalt should be modified before construction on account of the weakness in performance such as flowability at high temperature and brittleness at low temperature. Polymer modified Asphalt (PMA) is the most effective valuable method acknowledged by all researchers in this field. Ethylene–acrylic acid copolymer (EAA) is compounded by ethylene and acrylic acid, which has no unsaturated bond, thus it could enhance Asphalt a better performance in aging resistance and stability. Moreover, acrylic acid chains in EAA could have a strong binding force with alkaline aggregate. In this paper, three different types of EAA with different acrylic acid content were adopted to modify the Asphalt. Softening points, penetration, viscosity, storage stability at high temperature, microstructure, rheological properties and adhesive capacity of the modified Asphalt were investigated. Results showed that, with adding more EAAs, softening point and viscosity of the modified Asphalt were both increasing while penetration decreased. Softening point approached to 60.5 °C from 46 °C at EAA 1321 content of 10% by weight. For the same dosage of different types of EAA, the properties of modified Asphalts were mainly affected by the melting index of EAA since the content of EAA was less than 6 wt%. When EAA content was more than 6%, the properties of the Asphalts were evolved with the change of acrylic acid content. Complex shear modulus (G∗) of the modified Asphalts increased both at high and low temperature after incorporating EAA, indicating that EAA could improve the stiffness of Asphalt. The drop of tanδ showed the elastic behavior of modified Asphalt after modification. Solubility parameter theory and blending theory were selected to explain the bad performance of modified Asphalt in storage stability. Adhesive capacity of modified Asphalt tended to be better with the increasing of EAA content. Methods to improve the storage stability at high temperature of EAA modified Asphalt still remained to be researched in the next.
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thermo rheological properties and storage stability of sebs kaolinite clay compound modified Asphalts
European Polymer Journal, 2006Co-Authors: Chunfa Ouyang, Shifeng Wang, Yong Zhang, Yinxi ZhangAbstract:Abstract Styrene–ethylene–butadiene–styrene block copolymer (SEBS) modified Asphalts with improved high-temperature storage stability are prepared by incorporating kaolinite clay (KC) into the SEBS compounds. The effect of KC on the high-temperature storage properties, dynamic rheological and mechanical properties and morphologies of the modified Asphalts are studied. It is found that the SEBS/KC ratio in the compound has a great effect on the high-temperature storage behavior. The modified Asphalts are stable when the ratio of SEBS/KC is around 2. However, KC decreases the dynamic rheological and mechanical properties of the modified Asphalts to some extent. The high-temperature storage property can be increased by improving the compatibility and decreasing the density difference between SEBS and Asphalt.
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preparation and properties of styrene butadiene styrene copolymer kaolinite clay compound and Asphalt modified with the compound
Polymer Degradation and Stability, 2005Co-Authors: Chunfa Ouyang, Shifeng Wang, Yong Zhang, Yinxi ZhangAbstract:Abstract Styrene–butadiene–styrene copolymer (SBS)/kaolinite clay (KC) compounds were prepared using a mixing technique. The effects of SBS/KC ratio and mixing temperature on the mechanical properties of the compounds and the distribution of molecular weight of SBS were investigated. The compounds were successfully used to improve the high-temperature storage stability of Asphalts as compared with pure SBS modified Asphalts. The improvement in high-temperature storage stability could be attributed to the KC in the SBS/KC compounds for it decreased the difference of densities between SBS and Asphalt. The effects of KC on the high-temperature storage properties, mechanical properties, dynamic mechanical properties, and morphologies of SBS/KC modified Asphalts were studied. The SBS/KC ratio in the compounds had a great effect on the high-temperature storage stability. The modified Asphalts were very stable at high temperature when the SBS/KC ratio was around 3. The maximum KC content in the modified Asphalts was 2%, and the KC content had slight influence on the mechanical properties of the modified Asphalts. The KC could improve the rheological properties of the modified Asphalt to some extent.
Shifeng Wang - One of the best experts on this subject based on the ideXlab platform.
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pyrolyzed wax from recycled cross linked polyethylene as warm mix Asphalt wma additive for sbs modified Asphalt
Construction and Building Materials, 2011Co-Authors: Lina Shang, Shifeng Wang, Yong Zhang, Yinxi ZhangAbstract:Abstract Recycled polyethylene wax is a kind of pyrolyzed wax obtained from the recycled polyethylene. Effects of recycled pyrolytic cross-linked polyethylene wax (RPPW) on the properties of base Asphalt and SBS modified Asphalt were investigated. The effects of RPPW and Sasobit wax on the Asphalt performance, structure and thermal behavior were also compared. RPPW showed superior viscosity decreasing effect on SBS modified Asphalt at high-temperature. Addition of RPPW reduced penetration, increased softening point and penetration index of both base Asphalt and SBS modified Asphalt. Addition of RPPW also increased the complex modulus and decreased the phase angle of base Asphalt and SBS modified Asphalt. The results show that Asphalts modified by RPPW have promised remarkable construction performance at lower temperature for warm mix Asphalt. Therefore, this study represents a novel attempt to deal with the rapid growth of cross-linked polyethylene, which is very significant from an environmental and economic standpoint.
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thermo rheological properties and storage stability of sebs kaolinite clay compound modified Asphalts
European Polymer Journal, 2006Co-Authors: Chunfa Ouyang, Shifeng Wang, Yong Zhang, Yinxi ZhangAbstract:Abstract Styrene–ethylene–butadiene–styrene block copolymer (SEBS) modified Asphalts with improved high-temperature storage stability are prepared by incorporating kaolinite clay (KC) into the SEBS compounds. The effect of KC on the high-temperature storage properties, dynamic rheological and mechanical properties and morphologies of the modified Asphalts are studied. It is found that the SEBS/KC ratio in the compound has a great effect on the high-temperature storage behavior. The modified Asphalts are stable when the ratio of SEBS/KC is around 2. However, KC decreases the dynamic rheological and mechanical properties of the modified Asphalts to some extent. The high-temperature storage property can be increased by improving the compatibility and decreasing the density difference between SEBS and Asphalt.
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preparation and properties of styrene butadiene styrene copolymer kaolinite clay compound and Asphalt modified with the compound
Polymer Degradation and Stability, 2005Co-Authors: Chunfa Ouyang, Shifeng Wang, Yong Zhang, Yinxi ZhangAbstract:Abstract Styrene–butadiene–styrene copolymer (SBS)/kaolinite clay (KC) compounds were prepared using a mixing technique. The effects of SBS/KC ratio and mixing temperature on the mechanical properties of the compounds and the distribution of molecular weight of SBS were investigated. The compounds were successfully used to improve the high-temperature storage stability of Asphalts as compared with pure SBS modified Asphalts. The improvement in high-temperature storage stability could be attributed to the KC in the SBS/KC compounds for it decreased the difference of densities between SBS and Asphalt. The effects of KC on the high-temperature storage properties, mechanical properties, dynamic mechanical properties, and morphologies of SBS/KC modified Asphalts were studied. The SBS/KC ratio in the compounds had a great effect on the high-temperature storage stability. The modified Asphalts were very stable at high temperature when the SBS/KC ratio was around 3. The maximum KC content in the modified Asphalts was 2%, and the KC content had slight influence on the mechanical properties of the modified Asphalts. The KC could improve the rheological properties of the modified Asphalt to some extent.
