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Chao Peng
Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

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Journal article
Published: 19 August 2021 in Minerals
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This research aimed to investigate the effect of fine aggregate particles on mechanical properties of fly ash-based geopolymer mortar. In this work, seven kinds of river sand particles were designed based on different fine aggregate characteristics. The fineness modulus was adopted to quantitatively describe the gradation of sands. The fluidity, compressive, flexural, and tensile strengths of geopolymer mortar with different sand gradations were analyzed by laboratory tests. Furthermore, the composition and morphology of fly ash-based geopolymer mortar was analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The reasonable gradation range and filling effect of sand were obtained. The results show that fluidity and compressive and flexural strengths of geopolymer mortar both improve with the increase of the fineness modulus, while specific surface area and voidage are opposite. The tensile strength of mortar largely lies on the interface properties between the geopolymer binder and fine aggregates. When the pass rate of the key sieving size 1.18 mm is 75–95%, the pass rate of the key sieving size 0.15 mm is 15–25%, the fineness modulus is 2.2–2.6 and the appropriate filling coefficient of geopolymer paste is around 1.0–1.15, the comprehensive performance of geopolymer mortar is the best. This research paper could provide a basis for the design of geopolymer mortar based on fly ash, and it is of great significance for its popularization and application.

ACS Style

Heng Li; Pengpeng Gao; Fang Xu; Tao Sun; Yu Zhou; Jing Zhu; Chao Peng; Juntao Lin. Effect of Fine Aggregate Particle Characteristics on Mechanical Properties of Fly Ash-Based Geopolymer Mortar. Minerals 2021, 11, 897 .

AMA Style

Heng Li, Pengpeng Gao, Fang Xu, Tao Sun, Yu Zhou, Jing Zhu, Chao Peng, Juntao Lin. Effect of Fine Aggregate Particle Characteristics on Mechanical Properties of Fly Ash-Based Geopolymer Mortar. Minerals. 2021; 11 (8):897.

Chicago/Turabian Style

Heng Li; Pengpeng Gao; Fang Xu; Tao Sun; Yu Zhou; Jing Zhu; Chao Peng; Juntao Lin. 2021. "Effect of Fine Aggregate Particle Characteristics on Mechanical Properties of Fly Ash-Based Geopolymer Mortar." Minerals 11, no. 8: 897.

Journal article
Published: 06 September 2020 in Construction and Building Materials
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Icing asphalt pavement affects driving safety. The purpose of this research is to find a solution to improve the anti-icing performance of asphalt pavement. An acrylic superhydrophobic coating (ASC) on asphalt pavement was prepared from uncured acrylic acid and carbon nanotubes. The contact angle and rolling angle of water droplets on the ASC surface are 155.173° and 4.26°. The icing observation experiment shows that the freezing time of the water droplet on the ASC surface is prolonged by 17% in comparison with that on the asphalt mixture surface. The anti-skid performance test results reveal that the coefficient of friction of the ASC is improved by 5.7% than that of asphalt pavement. The water permeability test results show that ASC can prevent water from penetrating the upper pavement structure, thereby reducing moisture damage. The results of this research indicate that ASC has good potential to improve the anti-icing performance of asphalt pavement.

ACS Style

Chao Peng; Xin Hu; Zhanping You; Fang Xu; Guosheng Jiang; Hui Ouyang; Chong Guo; Hongchao Ma; Li Lu; Jing Dai. Investigation of anti-icing, anti-skid, and water impermeability performances of an acrylic superhydrophobic coating on asphalt pavement. Construction and Building Materials 2020, 264, 120702 .

AMA Style

Chao Peng, Xin Hu, Zhanping You, Fang Xu, Guosheng Jiang, Hui Ouyang, Chong Guo, Hongchao Ma, Li Lu, Jing Dai. Investigation of anti-icing, anti-skid, and water impermeability performances of an acrylic superhydrophobic coating on asphalt pavement. Construction and Building Materials. 2020; 264 ():120702.

Chicago/Turabian Style

Chao Peng; Xin Hu; Zhanping You; Fang Xu; Guosheng Jiang; Hui Ouyang; Chong Guo; Hongchao Ma; Li Lu; Jing Dai. 2020. "Investigation of anti-icing, anti-skid, and water impermeability performances of an acrylic superhydrophobic coating on asphalt pavement." Construction and Building Materials 264, no. : 120702.

Journal article
Published: 15 May 2020 in Construction and Building Materials
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This paper proposed a new type of fly ash-based geopolymer foams (FAGF) designed for wall insulation in buildings. The first part investigated the pore structures and properties of FAGF such as porosity, average Feret diameter (AFD), and roundness via a variation of the mix ratios and contents of precast foam. Then the results were further supported by the microstructures of pores, leading to the optimization of mix formulations of precast foam in terms of FAGF. The second part of this study explored the relationship between precast foam properties and FAGF performance. Then the influence of foam content on the pore structure parameters, fluidity, dry density, compressive strength and thermal conductivity of FAGF were measured and analyzed, revealing the mechanism of pore forming within FAGF. The results indicated that the foam in the paste was mainly controlled by five kinds of forces: surface tension Fst, internal gas pressure Pi, drainage force Fd extrusion binding force Fc and buoyancy Fb. When these forces were balanced, the foam was in a relatively stable state in the paste, resulting in the uniform pore size distribution and the excellent macro properties of FAGF.

ACS Style

Gonghui Gu; Fang Xu; Shaoqin Ruan; XiaoMing Huang; Jing Zhu; Chao Peng. Influence of precast foam on the pore structure and properties of fly ash-based geopolymer foams. Construction and Building Materials 2020, 256, 119410 .

AMA Style

Gonghui Gu, Fang Xu, Shaoqin Ruan, XiaoMing Huang, Jing Zhu, Chao Peng. Influence of precast foam on the pore structure and properties of fly ash-based geopolymer foams. Construction and Building Materials. 2020; 256 ():119410.

Chicago/Turabian Style

Gonghui Gu; Fang Xu; Shaoqin Ruan; XiaoMing Huang; Jing Zhu; Chao Peng. 2020. "Influence of precast foam on the pore structure and properties of fly ash-based geopolymer foams." Construction and Building Materials 256, no. : 119410.

Journal article
Published: 06 March 2020 in Polymers
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Waste engine oil (WEO) and waste polyethylene (WPE) are two common wastes, which are easy to pollute the environment. As the primary material in road construction, natural asphalt is a non-renewable energy source and asphalt is vulnerable to ultraviolet (UV) radiation during the service life. It results in degradation of asphalt pavement performance. In this paper, 2 wt % to 8 wt % of WEO and WPE were used to modify asphalts and the UV aging simulation experiment was carried out. The physical parameters of asphalts before the UV aging experiment show that the asphalt containing 4 wt % WPE and 6 wt % WEO mixture (4 wt % WPE + 6 wt % WEO) has similar physical properties with that of the matrix asphalt. Besides, gel permeation chromatography (GPC) verifies that the molecular weight distribution of the asphalt containing 4 wt % WPE + 6 wt % WEO is close to that of the matrix asphalt. The storage stability test shows that 4 wt % WPE + 6 wt % WEO has good compatibility with the matrix asphalt. The functional groups and micro-morphology of asphalts before and after the UV aging experiment were investigated by Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM). FTIR results display that 4 wt % WPE + 6 wt % WEO can effectively reduce the formation of carbonyl and sulfoxide functional groups. AFM shows that 4 wt % WPE + 6 wt % WEO can also retard the formation of a “bee-like” structure in asphalt after the UV aging experiment. Based on the above results, it can be concluded that WEO and WPE mixture can replace part of asphalt and improve the UV aging resistance of asphalt.

ACS Style

Chao Peng; Chong Guo; Zhanping You; Fang Xu; Wenbo Ma; Lingyun You; Tianjun Li; Lizhen Zhou; Shifan Huang; Hongchao Ma; Li Lu. The Effect of Waste Engine Oil and Waste Polyethylene on UV Aging Resistance of Asphalt. Polymers 2020, 12, 602 .

AMA Style

Chao Peng, Chong Guo, Zhanping You, Fang Xu, Wenbo Ma, Lingyun You, Tianjun Li, Lizhen Zhou, Shifan Huang, Hongchao Ma, Li Lu. The Effect of Waste Engine Oil and Waste Polyethylene on UV Aging Resistance of Asphalt. Polymers. 2020; 12 (3):602.

Chicago/Turabian Style

Chao Peng; Chong Guo; Zhanping You; Fang Xu; Wenbo Ma; Lingyun You; Tianjun Li; Lizhen Zhou; Shifan Huang; Hongchao Ma; Li Lu. 2020. "The Effect of Waste Engine Oil and Waste Polyethylene on UV Aging Resistance of Asphalt." Polymers 12, no. 3: 602.

Journal article
Published: 02 March 2020 in Construction and Building Materials
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Polyurethane is gradually used to chemically modify asphalt binder due to its outstanding compatibility with asphalt binder. One of the plant wastes (lignin) containing hydroxyl groups on its surface can replace one of the raw materials (polyether polyol) to prepare lignin-based polyurethane (LPU). To investigate the adhesion properties of lignin-based polyurethane modified asphalt binder (LPUA) during UV aging process, LPUA was prepared by high-temperature blending of lignin, toluene diisocyanate and matrix asphalt binder (MA). The adhesion properties of asphalt binders were evaluated by the pull-off experiment, ultrasonic washing experiment and contact angle test. The pull-off experiment shows that the tensile strength of LPUA increases by 27.3% in comparison with that of MA. UV aging process has a fragile effect on decreasing the tensile strength of LPUA. The ultrasonic washing experiment testifies that LPUA before and after UV aging process can be effectively retained on the aggregate surface even under the dynamic water environment. The contact angle test displays that LPUA can preserve its adhesion and stripping energies of asphalt binder during UV aging process. Fourier transform infrared spectrometer (FTIR) analysis exhibits that anhydride group and lignin-based benzene ring in LPUA are beneficial to improve the adhesion properties of asphalt binders before and after UV aging process. Based on the above results, it can be concluded that LPUA has satisfactory adhesion properties during UV aging process.

ACS Style

Chao Peng; Shifan Huang; Zhanping You; Fang Xu; Lingyun You; Hui Ouyang; Tianjun Li; Chong Guo; Hongchao Ma; PengXu Chen; Jing Dai. Effect of a lignin-based polyurethane on adhesion properties of asphalt binder during UV aging process. Construction and Building Materials 2020, 247, 118547 .

AMA Style

Chao Peng, Shifan Huang, Zhanping You, Fang Xu, Lingyun You, Hui Ouyang, Tianjun Li, Chong Guo, Hongchao Ma, PengXu Chen, Jing Dai. Effect of a lignin-based polyurethane on adhesion properties of asphalt binder during UV aging process. Construction and Building Materials. 2020; 247 ():118547.

Chicago/Turabian Style

Chao Peng; Shifan Huang; Zhanping You; Fang Xu; Lingyun You; Hui Ouyang; Tianjun Li; Chong Guo; Hongchao Ma; PengXu Chen; Jing Dai. 2020. "Effect of a lignin-based polyurethane on adhesion properties of asphalt binder during UV aging process." Construction and Building Materials 247, no. : 118547.

Journal article
Published: 24 September 2018 in Construction and Building Materials
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Ice formation on asphalt pavement may lead to potential hazards for driving safety. To reduce the safety risk, this paper aims at preparing a superhydrophobic coating (SC) on asphalt pavement. Room-temperature vulcanized silicone rubber (RTV) is the main component of the SC. The micro-/nano- SiO2 particles modified by a silane coupling agent (KH550) were sprayed on the RTV surfaces to prepare the SC. The contact angle test and surface morphology observation results indicate that the contact angle of water droplets increases effectively due to the rough micron-/nano- structures on the SC. Additionally, icing observation reveals that SC delayed icing time of water droplets 1.5 times longer than the asphalt mixture specimen without SC. Adhesion force between ice and SC decreases by 84% compared with that between the ice and asphalt mixture at −5 °C. The tensile strength of the RTV sheet containing 30 parts per hundred parts (phr) of fumed silica is 13 times than that of the RTV sheet without fumed silica. Adhesion force between SC and asphalt mixture achieve the maximum value of 875 kN when SC contains 5 phr of KH550. To sum up, it can be concluded that the SC has superior anti-icing and mechanical properties on asphalt pavement.

ACS Style

Chao Peng; PengXu Chen; Zhanping You; Songtao Lv; Fang Xu; Weili Zhang; Jianying Yu; Hao Zhang. The anti-icing and mechanical properties of a superhydrophobic coating on asphalt pavement. Construction and Building Materials 2018, 190, 83 -94.

AMA Style

Chao Peng, PengXu Chen, Zhanping You, Songtao Lv, Fang Xu, Weili Zhang, Jianying Yu, Hao Zhang. The anti-icing and mechanical properties of a superhydrophobic coating on asphalt pavement. Construction and Building Materials. 2018; 190 ():83-94.

Chicago/Turabian Style

Chao Peng; PengXu Chen; Zhanping You; Songtao Lv; Fang Xu; Weili Zhang; Jianying Yu; Hao Zhang. 2018. "The anti-icing and mechanical properties of a superhydrophobic coating on asphalt pavement." Construction and Building Materials 190, no. : 83-94.

Journal article
Published: 15 September 2018 in Applied Sciences
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To improve the performance of petroleum asphalt, bio-char was used as a modifier for a petroleum asphalt binder, in this study. The rheological properties of bio-char modified asphalt binders were compared with different particle sizes and contents, with one control and one flake graphite modified asphalt binder. Specifically, the bio-char modifiers with two particle sizes (ranging from 75 μm–150 μm and less than 75 μm) and three contents of 2%, 4%, and 8% were added into the asphalt binder. A flake graphite powder with particle sizes less than 75 μm was used as a comparison modifier. The Scanning Electron Microscopy (SEM) image showed the porous structure and rough surface of bio-char as well as dense structure and smooth surface of flake graphite. A Rotational Viscosity (RV) test, Dynamic Shear Rheometer (DSR) test, aging test, and Bending Beam Rheometer (BBR) test were performed to evaluate the properties of bio-char modified asphalt in this study. Both modifiers could improve the rotational viscosities of the asphalt binders. The porous structure and rough surface of bio-char lead to larger adhesion interaction in asphalt binder than the smooth flake graphite. As a result, the bio-char modified asphalts had better high-temperature rutting resistance and anti-aging properties than the graphite modified asphalt, especially for the binders with the smaller-sized and higher content of bio-char particles. Furthermore, the asphalt binder modified by the bio-char with sizes less than 75 μm and about 4% content could also achieve a better low-temperature crack resistance, in comparison to other modified asphalt binders. Thus, this type of bio-char particles is recommended as a favorable modifier for asphalt binder.

ACS Style

Ran Zhang; Qingli Dai; Zhanping You; Hainian Wang; Chao Peng. Rheological Performance of Bio-Char Modified Asphalt with Different Particle Sizes. Applied Sciences 2018, 8, 1665 .

AMA Style

Ran Zhang, Qingli Dai, Zhanping You, Hainian Wang, Chao Peng. Rheological Performance of Bio-Char Modified Asphalt with Different Particle Sizes. Applied Sciences. 2018; 8 (9):1665.

Chicago/Turabian Style

Ran Zhang; Qingli Dai; Zhanping You; Hainian Wang; Chao Peng. 2018. "Rheological Performance of Bio-Char Modified Asphalt with Different Particle Sizes." Applied Sciences 8, no. 9: 1665.

Journal article
Published: 12 September 2018 in Construction and Building Materials
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The objective of this study is to investigate the possibility of using bio-oil derived from waste wood as a rejuvenator to recycle aged asphalt binders. In this study, petroleum asphalt of PG58-28 was selected as the base binder. The bio-oil rejuvenators with concentrations of 10%, 15% and 20% by weight were added into the Pressure Aging Vessel (PAV) aged base binder to prepare the bio-rejuvenated asphalts. Through the chemical compounds analysis of the bio-oil using the Gas Chromatograph Mass Spectrometer (GC–MS) test, it can be found that the bio-oil derived from waste wood contains a high content of light compounds, including phenol, naphthalene, diethyl phthalate and so on. The rheological properties of bio-rejuvenated asphalts were evaluated and compared with the virgin and aged asphalts by Rotational Viscometer (RV), Dynamic Shear Rheometer (DSR) and Bending Beam Rheometer (BBR) tests. The bio-rejuvenator can increase the viscous components and alleviate the stiffness of the aged asphalt binder. The high content of light compounds in the bio-oil balanced the chemical compounds of the aged asphalt. As a result, the rutting resistance and fatigue resistance of the aged asphalt binder were restored by the bio-oil significantly. The low temperature crack resistance of aged asphalt binder can be restored to approximately to that of the PG 58-28 by the bio-rejuvenator with the concentration of 15% and 20%. The bio-oil concentration had less impact on the rheological properties of bio-rejuvenated asphalts when the bio-oil concentration was higher than 15%. Therefore, the bio-oil with a concentration of 15% was recommended to rejuvenate the aged asphalt binder to be reused in the construction of pavement.

ACS Style

Ran Zhang; Zhanping You; Hainian Wang; Xi Chen; Chundi Si; Chao Peng. Using bio-based rejuvenator derived from waste wood to recycle old asphalt. Construction and Building Materials 2018, 189, 568 -575.

AMA Style

Ran Zhang, Zhanping You, Hainian Wang, Xi Chen, Chundi Si, Chao Peng. Using bio-based rejuvenator derived from waste wood to recycle old asphalt. Construction and Building Materials. 2018; 189 ():568-575.

Chicago/Turabian Style

Ran Zhang; Zhanping You; Hainian Wang; Xi Chen; Chundi Si; Chao Peng. 2018. "Using bio-based rejuvenator derived from waste wood to recycle old asphalt." Construction and Building Materials 189, no. : 568-575.

Journal article
Published: 07 September 2018 in Construction and Building Materials
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The formation of ice on pavement is a serious issue for driving safety. This paper proposes a new method of preparing a superhydrophobic silicone coating on asphalt pavement surfaces for the anti-icing purpose. The object of this paper is to investigate the anti-icing properties of the superhydrophobic silicone coating through the freezing time of water droplets and detachment forces of ice on asphalt mixture surfaces. In the preparation process of the coatings, an additive (layered double hydroxides, or LDHs) was initially modified by γ-methacryloxypropyltrimethoxysilane (KH550). Fourier transform infrared spectra and X-ray diffraction patterns were used to prove that LDHs particles have been successfully grafted by KH550. A special rubber (No. 107 room temperature vulcanized silicone rubber, or RTV) was then mixed with the modified LDHs to obtain the compound coating. Different amounts of solvents (No. 120 solvent naphtha) were sprayed on the compound coating to produce the micro/nano-scale rough surface. Contact angle test results show that the maximum contact angle of RTV and modified LDHs compound (RTV/LDHs) coating is 152.3° when 100 g/m2 of No. 120 solvent naphtha was sprayed on this coating. The freezing time of water droplet on the asphalt mixture with RTV/LDHs coating is 3 times longer than that on the asphalt mixture without coating. The ice detachment force on the asphalt mixture with RTV/LDHs coating decreases by 71% of that on the asphalt mixture without coatings. The vehicle traveling test displays that the RTV/LDHs coating has durable hydrophobic and anti-icing properties after the tire friction. From the above results, it can be concluded that this new superhydrophobic silicone coating makes significant improvements on the anti-icing properties of asphalt pavement.

ACS Style

Chao Peng; Hao Zhang; Zhanping You; Fang Xu; Guosheng Jiang; Songtao Lv; Ran Zhang; Hao Yang. Preparation and anti-icing properties of a superhydrophobic silicone coating on asphalt mixture. Construction and Building Materials 2018, 189, 227 -235.

AMA Style

Chao Peng, Hao Zhang, Zhanping You, Fang Xu, Guosheng Jiang, Songtao Lv, Ran Zhang, Hao Yang. Preparation and anti-icing properties of a superhydrophobic silicone coating on asphalt mixture. Construction and Building Materials. 2018; 189 ():227-235.

Chicago/Turabian Style

Chao Peng; Hao Zhang; Zhanping You; Fang Xu; Guosheng Jiang; Songtao Lv; Ran Zhang; Hao Yang. 2018. "Preparation and anti-icing properties of a superhydrophobic silicone coating on asphalt mixture." Construction and Building Materials 189, no. : 227-235.

Journal article
Published: 05 September 2018 in European Journal of Oncology Nursing
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Patients diagnosed with breast cancer exhibited critical biopsychosocial functions following surgery or adjuvant treatment; therefore, it is important that they exhibit resilience. A Resilience Model for Breast Cancer (RM-BC) was developed using Chinese breast cancer patients to increase our understanding of how resilience outcomes are positively and negatively affected by protective and risk factors, respectively. Chinese women with breast cancer completed the questionnaires within 1 week of beginning treatment. Exploratory Structural Equation Modeling was used to evaluate the RM-BC using a sample size of 342 patients. RM-BC suggested satisfactory goodness-of-fit indices and 67 percents of variance for resilience was explained. The Fit Indices for the measurement model were as follows: CFI = 0.909, GFI = 0.911, IFI = 0.897, NFI = 0.922, PNFI = 0.896, PCFI = 0.884, and RMSEA = 0.031. Three risk factors — emotional distress, physical distress, and intrusive thoughts — and four protective factors — self-efficacy, social support, courage-related strategy, and hope — were recognized. The resilience model allows for a better understanding of Chinese breast cancer patients' resilience integration while undergoing treatment and provides an effective structure for the development of resilience-focused interventions that are grounded in their experiences. A randomized trial has provided evidences of feasibility in Chinese women with breast cancer and the resilience model could be used as a useful framework for more resilience intervention in the future.

ACS Style

Zeng Jie Ye; Chao Hua Peng; Hao Wei Zhang; Mu Zi Liang; Jing Jing Zhao; Zhe Sun; Guang Yun Hu; Yuan Liang Yu. A biopsychosocial model of resilience for breast cancer: A preliminary study in mainland China. European Journal of Oncology Nursing 2018, 36, 95 -102.

AMA Style

Zeng Jie Ye, Chao Hua Peng, Hao Wei Zhang, Mu Zi Liang, Jing Jing Zhao, Zhe Sun, Guang Yun Hu, Yuan Liang Yu. A biopsychosocial model of resilience for breast cancer: A preliminary study in mainland China. European Journal of Oncology Nursing. 2018; 36 ():95-102.

Chicago/Turabian Style

Zeng Jie Ye; Chao Hua Peng; Hao Wei Zhang; Mu Zi Liang; Jing Jing Zhao; Zhe Sun; Guang Yun Hu; Yuan Liang Yu. 2018. "A biopsychosocial model of resilience for breast cancer: A preliminary study in mainland China." European Journal of Oncology Nursing 36, no. : 95-102.

Journal article
Published: 01 April 2018 in Construction and Building Materials
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Moisture damage negatively affects the pavement service life. A typical way to delay the moisture damage is to improve the adhesion between asphalt binder and aggregates. The purpose of this paper is to investigate the effects of silane coupling agent (SCA) on improving the adhesion between asphalt binder and aggregates. In this paper, the contact angles of the aggregates modified by different SCA hydrolysates were measured. The adhesion energy and stripping energy between asphalt binder and aggregates modified by different SCA hydrolysates were calculated. Secondly, the tensile strengths between asphalt binder and aggregates before and after immersion in water were measured. Lastly, the interfacial interactions between SCA and the aggregates were studied by Fourier transform infrared (FTIR) and scanning electronic microscopy (SEM). The surface energy results prove that the SCA can significantly improve the adhesion energy and stripping energy between the aggregates and the asphalt binder. The tensile test results show that the tensile strength of the aggregates modified with a type of SCA (KH550) hydrolysate before immersion in water was increased by 58%, and the tensile strength after the immersion in water was increased by 155%. Based upon these results, it can be concluded that using SCA has a superior effect on improving adhesive properties between asphalt binder and aggregates.

ACS Style

Chao Peng; PengXu Chen; Zhanping You; Songtao Lv; Ran Zhang; Fang Xu; Hao Zhang; Hanlin Chen. Effect of silane coupling agent on improving the adhesive properties between asphalt binder and aggregates. Construction and Building Materials 2018, 169, 591 -600.

AMA Style

Chao Peng, PengXu Chen, Zhanping You, Songtao Lv, Ran Zhang, Fang Xu, Hao Zhang, Hanlin Chen. Effect of silane coupling agent on improving the adhesive properties between asphalt binder and aggregates. Construction and Building Materials. 2018; 169 ():591-600.

Chicago/Turabian Style

Chao Peng; PengXu Chen; Zhanping You; Songtao Lv; Ran Zhang; Fang Xu; Hao Zhang; Hanlin Chen. 2018. "Effect of silane coupling agent on improving the adhesive properties between asphalt binder and aggregates." Construction and Building Materials 169, no. : 591-600.

Journal article
Published: 01 September 2017 in Construction and Building Materials
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ACS Style

Fang Xu; Xin Deng; Chao Peng; Jing Zhu; Jianping Chen. Mix design and flexural toughness of PVA fiber reinforced fly ash-geopolymer composites. Construction and Building Materials 2017, 150, 179 -189.

AMA Style

Fang Xu, Xin Deng, Chao Peng, Jing Zhu, Jianping Chen. Mix design and flexural toughness of PVA fiber reinforced fly ash-geopolymer composites. Construction and Building Materials. 2017; 150 ():179-189.

Chicago/Turabian Style

Fang Xu; Xin Deng; Chao Peng; Jing Zhu; Jianping Chen. 2017. "Mix design and flexural toughness of PVA fiber reinforced fly ash-geopolymer composites." Construction and Building Materials 150, no. : 179-189.

Research article
Published: 25 August 2016 in Journal of Nanomaterials
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Graphene nanoplatelets (Gnps) were covalently functionalized by 3-aminopropyltriethoxysilane (KH550) and noncovalently functionalized by Triton X-100, respectively. The morphology and structure of KH550 modified graphene (K-Gnp) and Triton X-100 modified graphene (T-Gnp) were characterized by Fourier transform infrared spectroscopy, scanning electron micrograph, and Raman spectrometer. The influences of K-Gnp and T-Gnp on thermal conductivity, fracture toughness, and thermal stability of the boron phenolic resin (BPR) were investigated. Both covalently functionalized K-Gnp and noncovalently functionalized T-Gnp not only improve the dispersion of Gnp in the polymer matrix but also increase interfacial bonding strength between the BPR matrix and Gnp, thus leading to the enhanced mechanical property and thermal stability of nanocomposites. Besides this, mechanical property and thermal stability of the BPR containing K-Gnp are superior to those of BPR containing T-Gnp.1. IntroductionPhenolic resin (PR) is usually used as a resin matrix for ablative composites because of its excellent thermal stability, mechanical strength, and dielectric properties [1, 2]. Due to the introduction of boric acid (BA), boron phenolic resin (BPR) possesses enhanced thermal stability, especially the high thermal decomposition temperature and charring yield [3]. BPR and PR are both important resin matrixes of ablation resistant material for thermal protection system (TPS). In order to satisfy the requirements of the ablative materials, most of researchers have focused on incorporating carbon materials into PR. These carbon materials are including carbon nanofibers, carbon nanotubes, and graphite [4–6]. However, there were relatively few reports about the effect of carbon materials on the properties of BPR.In recent years, carbon nanomaterials have attracted considerable attention from many researchers because of the excellent performance, low density, low cost, and a large number of potential applications. Graphene [7–12] has been widely used as an ideal filler for polymers, due to its unique physical property, high specific area, and relatively low price. Many researchers have selected Gnp/graphene as a novel filler for polymer composites. Wang et al. [13] investigated the factors of Gnp sizes and dispersion on the mechanical and thermal properties of epoxy nanocomposites. The result showed that larger nanoplatelets (Gnp-5) not only exhibit greater reinforcement of the composites modulus than Gnp-C750 but also improve thermal conductivity of epoxy more effectively. Chandrasekaran et al. [14] studied the effect of Gnp on the electrical and thermal conductivity, fracture toughness, and storage modulus of the nanocomposite. The results revealed that the Gnp is an effective reinforcement of epoxies for their mechanical properties. Liu et al. [15] investigated the effect of graphene nanosheets on morphology, thermal stability, and flame retardancy of epoxy resin (ER) and found that graphene nanosheets change the decomposition pathway of ER at a high temperature, enhance the thermal stability, and promote the formation of carbon residue. Chatterjee et al. [16] studied the influence of Gnps and carbon nanotubes (CNTs) on the mechanical properties of epoxy-based nanocomposites and the results indicated that the nanocomposites containing Gnps have superior tensile and compressive strength compared to nanocomposite containing CNTs.Due to large surface area and strong van der Waals force, graphene tends to form irreversible agglomerates in polymer matrix and uniform dispersion of Gnp in the polymer matrix. In order to ensure a good dispersion of Gnp in the polymer matrix, functionalization process of Gnp is conducted. Two approaches, including covalent functionalization and noncovalent modification with various organic molecules, are usually used for modifying Gnp surface. Covalent functionalization can be achieved by yielding covalent linkages at the Gnp-polymer interface through the reaction between the carboxyl or hydroxyl groups of Gnp surface and surfactants’ groups. Lee et al. [17] prepared silane-functionalized graphene oxides (Go) with four different self-assembled monolayers and found that functionalized Go can strengthen the interfacial bonding between the carbon fibers and epoxy adhesive. Ma et al. [18] covalently modified graphene platelets by the reaction of the Gnps’ epoxide groups and the end-amine groups of a commercial long-chain surfactant and found that the modified Gnps (m-Gnps) increase Young’s modulus, fracture energy release rate, and glass transition temperature of epoxy by 14%, 387%, and 13%, respectively. In addition, noncovalent functionalization can be achieved by polymer wrapping, adsorption of surfactants, or small molecules via p–p stacking interactions. Li et al. [19] noncovalently functionalized graphene with poly(sodium 4-styrenesulfonate) (PSS) and found that functionalization process improves interfacial bonding between matrix and graphene. Teng et al. [20] noncovalently functionalized graphene nanosheets (GNS) by a functional segmented polymer chain (Py-PGMA) and found that thermal conductivity of Py-PGMA–GNS/epoxy composites increases remarkably owing to the well dispersion of GNS and interfacial interaction between GNS and resin. Although polymers modified by Gnp have been investigated by many researchers, the application of Gnp in BPR was rarely reported previously.In this study, Gnp/BPR composite was prepared by adding functionalized Gnp to BPR resin. Firstly, we modified the surface of Gnp to obtain functionalized Gnp by two different approaches. The first one is covalent functionalization method of bonding 3-Triethoxysilylpropylamine (KH550) coupling agent containing epoxy ended groups on the surface of the Gnp. The second one is noncovalent functionalization method of attaching electrostatic repulsion of the hydrophilic group of nonionic organic surfactant Triton X-100 to the surface of Gnp. Then we mixed modified Gnp with BPR resin and studied the effect of functionalization Gnp on the thermal stability and mechanical properties of BPR.2. Experimental2.1. MaterialsGnp was purchased from XG Sciences (Lansing, Michigan, USA). The average diameter of Gnp is approximately 5 mm and the thickness of Gnps is less than 10 nm. BPR was purchased from Benbu-Temperature Resistant Resin Factor Co., Ltd. (Anhui, China). 3-Triethoxysilylpropylamine (KH550) was produced by Nabo New Material Technology Co., Ltd., (Tianjin, China). Triton X-100, ethanol, acetone, and methanol were all made from Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China).2.2. KH550 Modification of Gnp0.4 g of Gnp was dispersed in 400 mL ethanol, followed by the addition of 2.5 g of KH550 and 0.5 mL H2O to the solution. Then, the mixed solution was placed in an oil bath and stirred at 70°C for 12 h. KH550 functionalized Gnp (K-Gnp) was filtered off and washed several times with ethanol, acetone, and methanol. The residue was dried at 80°C in a vacuum oven overnight.2.3. Triton X-100 Modification of GnpPristine Gnp powder (0.4 g) and Triton X-100 (0.6 g) were added into 400 mL ethanol with 1 h of ultrasonication. Then, the solution was placed in an oil bath and stirred at 70°C for 12 h. The resulting Triton-functionalized Gnp (T-Gnp) has undergone the same steps with Section 2.2.2.4. Preparation of Gnp/BPR CompositeBPR composites containing as-produced Gnp, T-Gnp, and K-Gnp were prepared by the following procedures. 40 g of BPR was added to the 40 mL ethanol and then the mixed solution was placed in an oil bath and stirred at 70°C until the BPR was dissolved in ethanol. Then, the modified Gnp was dispersed in the BPR solution with a bath sonication for 1 h at room temperature to prepare well dispersed Gnp/BPR. After bath sonication, the mixture was placed in an oil bath and stirred at 70°C for 12 h until the ethanol was almost evaporated. The product was dried in an oven at 60°C under the vacuum pressure of 0.085 MPa till a constant weight.Subsequently, the resulting mixture was degassed at 65°C to remove air bubbles and any residual solvent, followed by a casting procedure in silicone molds. Finally, the products were cured at 80°C, 100°C, 120°C, 150°C, and 150°C for 5 h, 2 h, 2 h, and 1 h each. The neat BPR was also prepared by the above procedures. The composites containing as-produced Gnp, K-Gnp, and T-Gnp were referred to as P-Gnp/BPR, K-Gnp/BPR, and T-Gnp/BPR, respectively.3. MeasurementsThe surfactant group of Gnp was characterized by Nicolet FTIR spectrophotometer (Nicolet 6700, Nicolet Instrument Company, USA). The wave numbers of spectra were recorded from 500 to 4000 cm−1 at a resolution of 2 cm−1 using KBr pellets.The tensile fracture surfaces of BPR-based samples and the microstructures of P-Gnp, K-Gnp, and T-Gnp were characterized by Quanta FEG450 environmental scanning electron microscope at an accelerated voltage of 15 kV. The sheets were dispersed in ethanol by sonication for 30 min and then were gold coated (3 nm thick gold) to avoid charging prior to observation.Raman spectra were recorded on a SENTERRA Micro Raman Spectroscopy (Bruker Instrument, Germany) with 500 nm laser excitation.Three-point bending flexural tests were conducted according to GB/T 2567-2008 method at room temperature [13] using a universal testing machine (RGM-4100, maximum capacity of 100 kN, China). The tests were performed at a constant loading speed of 2 mm min−1. The dumbbell-shaped samples were prepared with dimension of 90 mm × 12.7 mm × 3 mm. At least five specimens were tested for each group and all the results were calculated based on the average value of five tests.The thermal conductivities of the neat BPR and BPR composites at room temperature were measured by TC-7000HLaser flash apparatus at room temperature. The samples were cut into square shape with length of 8 mm and thickness of 1.6 mm.The thermal behavior of nanocomposite was characte

ACS Style

Jing Dai; Chao Peng; Fuzhong Wang; Guangwu Zhang; Zhixiong Huang. Effects of Functionalized Graphene Nanoplatelets on the Morphology and Properties of Phenolic Resins. Journal of Nanomaterials 2016, 2016, 1 -7.

AMA Style

Jing Dai, Chao Peng, Fuzhong Wang, Guangwu Zhang, Zhixiong Huang. Effects of Functionalized Graphene Nanoplatelets on the Morphology and Properties of Phenolic Resins. Journal of Nanomaterials. 2016; 2016 ():1-7.

Chicago/Turabian Style

Jing Dai; Chao Peng; Fuzhong Wang; Guangwu Zhang; Zhixiong Huang. 2016. "Effects of Functionalized Graphene Nanoplatelets on the Morphology and Properties of Phenolic Resins." Journal of Nanomaterials 2016, no. : 1-7.

Journal article
Published: 02 November 2015 in RSC Advances
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UV aging is the main cause of the deterioration of bitumen pavement.

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Chao Peng; Guosheng Jiang; Chunhua Lu; Fang Xu; Jianying Yu; Jing Dai. Effect of 4,4′-stilbenedicarboxylic acid-intercalated layered double hydroxides on UV aging resistance of bitumen. RSC Advances 2015, 5, 95504 -95511.

AMA Style

Chao Peng, Guosheng Jiang, Chunhua Lu, Fang Xu, Jianying Yu, Jing Dai. Effect of 4,4′-stilbenedicarboxylic acid-intercalated layered double hydroxides on UV aging resistance of bitumen. RSC Advances. 2015; 5 (116):95504-95511.

Chicago/Turabian Style

Chao Peng; Guosheng Jiang; Chunhua Lu; Fang Xu; Jianying Yu; Jing Dai. 2015. "Effect of 4,4′-stilbenedicarboxylic acid-intercalated layered double hydroxides on UV aging resistance of bitumen." RSC Advances 5, no. 116: 95504-95511.

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Published: 15 September 2015 in Road Materials and Pavement Design
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Chao Peng; Jianying Yu; Zhijie Zhao; Jing Dai; Jingyi Fu; Wei Wang. Effects of a sodium chloride deicing additive on the rheological properties of asphalt mastic. Road Materials and Pavement Design 2015, 17, 382 -395.

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Chao Peng, Jianying Yu, Zhijie Zhao, Jing Dai, Jingyi Fu, Wei Wang. Effects of a sodium chloride deicing additive on the rheological properties of asphalt mastic. Road Materials and Pavement Design. 2015; 17 (2):382-395.

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Chao Peng; Jianying Yu; Zhijie Zhao; Jing Dai; Jingyi Fu; Wei Wang. 2015. "Effects of a sodium chloride deicing additive on the rheological properties of asphalt mastic." Road Materials and Pavement Design 17, no. 2: 382-395.

Research article
Published: 05 April 2015 in Advances in Materials Science and Engineering
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UV radiation is a main factor to reduce the service life of asphalt pavement due to the UV aging of asphalt binder. To obtain enhanced UV aging resistance, an organic UV absorber called 2-hydroxy-4-n-octoxy-benzophenone (HNOB) had been intercalated into an inorganic UV absorber called Zn/Al layered double hydroxide (LDH) to play a combined anti-UV role in asphalt binder. Fourier transform infrared spectroscopy revealed that HNOB anions have been intercalated into the interlayer galleries of Zn/Al-LDH containing HNOB anions (Zn/Al-HNOB−-LDH). X-ray diffraction results of Zn/Al-LDH containingCO32−anions (Zn/Al-CO32--LDH) andZn/Al-CO32--LDH/styrene-butadiene-styrene (SBS) modified asphalt disclosed that asphalt molecules entered into LDH interlayer galleries to form an expanded phase structure. UV-Vis absorbance patterns showed that Zn/Al-HNOB−-LDH has a better capacity of blocking UV light due to the synergetic effect of HNOB and Zn/Al-LDH. The chemical fractions analysis, conventional physical tests, and rheological tests of SBS modified asphalt,Zn/Al-CO32--LDH/SBSmodified asphalt, and Zn/Al-HNOB−-LDH/SBS modified asphalt before and after UV aging testified that Zn/Al-HNOB−-LDH can improve the UV aging resistance of SBS modified asphalt more significantly.

ACS Style

Chao Peng; Jianying Yu; Jing Dai; Jian Yin. Effect of Zn/Al Layered Double Hydroxide Containing 2-Hydroxy-4-n-octoxy-benzophenone on UV Aging Resistance of Asphalt. Advances in Materials Science and Engineering 2015, 2015, 1 -13.

AMA Style

Chao Peng, Jianying Yu, Jing Dai, Jian Yin. Effect of Zn/Al Layered Double Hydroxide Containing 2-Hydroxy-4-n-octoxy-benzophenone on UV Aging Resistance of Asphalt. Advances in Materials Science and Engineering. 2015; 2015 ():1-13.

Chicago/Turabian Style

Chao Peng; Jianying Yu; Jing Dai; Jian Yin. 2015. "Effect of Zn/Al Layered Double Hydroxide Containing 2-Hydroxy-4-n-octoxy-benzophenone on UV Aging Resistance of Asphalt." Advances in Materials Science and Engineering 2015, no. : 1-13.

Journal article
Published: 24 February 2015 in AIP Advances
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Chao Peng; Jing Dai; Jianying Yu; Jian Yin. Intercalation of p-methycinnamic acid anion into Zn-Al layered double hydroxide to improve UV aging resistance of asphalt. AIP Advances 2015, 5, 027133 .

AMA Style

Chao Peng, Jing Dai, Jianying Yu, Jian Yin. Intercalation of p-methycinnamic acid anion into Zn-Al layered double hydroxide to improve UV aging resistance of asphalt. AIP Advances. 2015; 5 (2):027133.

Chicago/Turabian Style

Chao Peng; Jing Dai; Jianying Yu; Jian Yin. 2015. "Intercalation of p-methycinnamic acid anion into Zn-Al layered double hydroxide to improve UV aging resistance of asphalt." AIP Advances 5, no. 2: 027133.