Study on Freeze-Thaw Damage Features of Coal Gangue-Fly Ash-Lime Mixture Based on Computed Tomography Scan

摘要：

　　Considering the freeze-thaw damages of coal gangue-fly ash-lime(CG-FA-L)mixture road base,this paper applies the computed tomography(CT)scan to investigate the freeze-thaw damage features of the mixture.Several freeze-thaw tests were carried out to disclose the attenuation law of the frost-resistance coefficient of the mixture.The micro-defect propagation of the CG-FA-L was analyzed by comparing the gray level histograms of the CT images on each specimen before and after freeze-thaw cycles.The loss of cross-sectional area in each specimen was calculated quantitatively by image segmentation.The results show that the frost-resistance index attenuated linearly with the increase in the number of cycles; the defects induced by freeze-thaw cycles were mostly less than 15mm deep,and grew at an increasingly fast speed as the number of cycles surpassed 5; the micro-defect caused by freeze-thaw action mainly affected the depth between 15 and 35mm; under the freeze-thaw cycles,the micro-defects inside the mixture mostly appeared in the cementitious materials of the fly ash and lime; the CT technology was applied satisfactorily in the analysis on the freeze-thaw features of the CG-FA-L mixture.

关键词： Coal gangue-fly ash-lime (CG-FA-L) mixture Freeze-thaw Damage features Computed tomography (CT) scan

作者: Wen-qing MENG Ya-peng ZHANG Qing-lin GUO Han-long CUI Xin-yi WANG Xiao-ting GAO

作者单位: College of Civil Engineering,Hebei University of Engineering,Handan 056038,PR China

会议类型: 国际会议

会议名称: 2019 International Conference on Informatics, Control and Robotics 2019信息学、控制和机器人学国际会议(ICICR2019)

会议地点: 上海

会议语种:英文

页码: 407-413

在线出版日期: 2019-06-16（万方平台首次上网日期，不代表论文的发表时间）