Using ESEM to analyze the microscopic property of basalt ﬁber reinforced asphalt concrete
|نوع نگارش مقاله||
scopus – master journals – JCR
۴٫۲۷۶ در سال ۲۰۲۰
۲۶ در سال ۲۰۲۱
۰٫۹۰۱ در سال ۲۰۲۰
|شاخص Quartile (چارک)||
Q1 در سال ۲۰۲۰
خرید محصول توسط کلیه کارت های شتاب امکان پذیر است و بلافاصله پس از خرید، لینک دانلود محصول در اختیار شما قرار خواهد گرفت و هر گونه فروش در سایت های دیگر قابل پیگیری خواهد بود.
فهرست مطالب مقاله:
The basalt ﬁber staggered distribution in the asphalt concrete matrix and the bonding situation between asphalt are analyzed by images collected using ﬁeld emission environmental scanning electron microscope (ESEM) test equipment. The results show that bonding of the ﬁber and the asphalt binder is very good and there is a strong binding force of chemical bonding connections between the two; the lipophilicity of basalt ﬁber is very good, the wrapped cover ability of asphalt for ﬁber is very strong; basalt ﬁber forms the local space network structure in the asphalt concrete matrix, eﬀectively overcome the relative slip between the particles, connect the damaged parts into a whole; basalt ﬁber across internal micropores, and the internal defects in material can be remedied. At the same time, crack resis- tance mechanism of the ﬁber to internal micro cracks is qualitatively explained according to the magnitude of the stress intensity factor K f .
|بخشی از متن مقاله:|
Microstructure of asphalt mixture is very important to its performance which is studied by the domestic and over- seas scholars. Although the importance of the asphalt mix- ture microstructure has been realized in the SHRP  program, it does not provide a detailed measurement and evaluation methodology of the microstructure of the asphalt mixture. In virtue of the digital image processing technology and CCD camera, Zhong Q.Y., etc . has shot the internal structure of asphalt mixture specimen, and the shape, orientation and spatial distribution of coarse aggre-
gate were quantitatively researched. Through CT scan of the internal structure of specimen which has been gyratory compaction and kneading compaction, Masad E, etc . found that the shape of internal void is aﬀected by diﬀerent molding methods. Kwan A.K., etc . proposed a method that the three-dimensional gradation of aggregate could be studied by two-dimension digital image. Wang L.B., etc . has put forward that the X-ray CT image could be used to reconstruct the three-dimensional distribution of asphalt mixture. Masad E., etc . has provided a validation method that the X-ray CT digital image processing tech- nology could be used to judge if the skeleton of internal aggregate of asphalt mixture is formed. The research on the microstructure of asphalt mixture is also carried out in China. Such as Zhang Qianna in Tongji University, Li Zhi in South China University of Technology, Chen J S in Taiwan University, etc. has studied the internal structure The current research on the microstructure of asphalt mixture is based on the not high-resolution digital imaging and CT scanning technology, for ﬁber which the diameter is in lm, the above testing instrument is not applied. The research of the micro mechanism, asphalt concrete which is reinforced by ﬁber, is mostly conﬁned by the interaction of ﬁber and asphalt. Usually use infrared spectroscopy to determine whether a new substance is appeared in the inter- face of ﬁbers and asphalt mortar, that is to verify whether it is physical connection chemical connection; by scanning electron microscopy to view the microscopic distribution of ﬁbers in asphalt morphology. However, whether the ﬁber is pulled out or broke up during the destruction of asphalt concrete matrix is not observed visualized, and at present, the micro analysis experiments are not related to the inﬂuence of ﬁber on constraint on the internal defects of asphalt concrete and the blocking of the micro cracks in asphalt concrete matrix. Therefore, it is very meaningful to study the actual state of the ﬁber in asphalt concrete matrix and the connection status of the micro injury part of the ﬁber in the matrix after cracking by means of visual micro analysis.
Compared with other homogeneous material and hydraulic binding material, asphalt mixture has relatively loose structure and obvious characteristics of particles, so the internal of the material will exist obvious macroscopic defects and structural defects, macroscopic defects such as holes, cracks, structural defects such as dislocation, phase boundary. Fracture mechanics considers [۱,۲] that the external force acts on the material and makes it destroyed, in essence, it is the rapid expansion of the internal cracks of the material which reduces internal eﬀective load bearing area, eventually leads to fracture. So in this paper, by means of microscopic analysis which is to compare the internal microscopic structure between conventional asphalt concrete and basalt ﬁber asphalt concrete, verify the addition of ﬁber will form an eﬀective space network structure in the asphalt concrete internal, connect the inter- nal micro cracks and holes, play a role in crack resistance and enhance the interface eﬀect between the asphalt, which makes the increase of eﬀective bearing area inside the asphalt concrete.
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