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Development and road performance of clear asphalt with high transparency and adhesion

Frontiers of Structural and Civil Engineering 2023年第2期17卷 238-255页

作者： Runhua GUO Siquan LIU School of Civil Engineering Tsinghua UniversityBeijing 100084China

Clear asphalt(CA)currently used in light-colored asphalt mixtures(LCAM)exhibits poor transparency and ***,a highly transparent CA(HCA)modified using a silane coupling agent(KH550)was ***,LCAM was prepared by mixing CA and limestone *** properties of the HCA and ordinary CA(OCA)were characterized using conventional asphalt tests,optical tests,pull-off tests,ultraviolet aging tests,dynamic shear rheometry,Fourier-transform infrared spectroscopy,differential scanning calorimetry,and scanning electron *** Marshall,moisture resistance,wheel tracking,trabecular bending,and British pendulum tests were employed for the *** transmittance and spectral reflectance of the HCA were 123.30 and 3.74 times greater than those of the OCA,*** complex modulus and viscosity-aging index of the HCA were 48%and 53%less than those of the OCA,*** modification with KH550,the Marshall stability ratio,tensile strength ratio,and flexural strain of the HCA-prepared LCAM increased by 12.92%,25.06%,and 23.90%,***,the rutting resistance of the HCA-prepared LCAM was 14.3%less than that of the OCA-prepared *** comprehensive performances of the HCA and HCA-prepared LCAM were 49.2%and 10.3%greater than those of the OCA and OCA-prepared LCAM,respectively,indicating a high application value in the future.

关键词： light-colored asphalt pavement orthogonal test road performance spectral reflectance silane-coupling agent

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Wear Behavior of PTFE–Hydroxyapatite Composite Fabricated by Hot-Press Sintering Process

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Acta Metallurgica Sinica(English Letters) 2014年第2期27卷 347-351页

作者： H.R.Zafarani M.Abdi M.E.Bahrololoom Department of Materials Science and Engineering School of EngineeringShiraz University

In the present work, a new biocompatible composite was fabricated by hot-press sinter-bonding of polytet- rafluoroethylene （PTFE）-hydroxyapatite composite. Furthermore, the wear properties of this composite were studied by computer-controlled pin-on-disk type tribometer in reporting volume loss per distance. The investigation was performed in three different fractions of hydroxyapatite （10, 20 and 30 wt%）. In order to improve the bonding between hydroxyapatite and PTFE, and thus to increase the wear properties of the composite, the effect of adding silane-coupling agent was investigated. Furthermore, to simulate the environment of human body, some of the wear tests were carried out in the ringer＇s solution. It was found that the wear resistance is improved at high load. Moreover, an optimum fraction of hydroxyapatite （20 wt%） was found in which the best wear resistance is achieved, especially at dry sliding condition. At last, the roles of the factors such as wear load, ringer＇s solution, and silane-coupling agent are described with respect to their influences on the Lancaster wear coefficient.

关键词： Hydroxyapatite composite Polymers silane-coupling agent Wear resistance

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