基于CT技术的复合沥青混凝土内部空隙特征分析

上海交通大学学报（自然版） ›› 2011, Vol. 45 ›› Issue (05): 667-671.

基于CT技术的复合沥青混凝土内部空隙特征分析

王振军a，沙爱民a,b，肖晶晶b，蒋玮b，王瑞a

（长安大学 a. 材料科学与工程学院；b. 长安大学特殊地区公路工程教育部重点实验室，西安 710064）

收稿日期:2010-10-15 出版日期:2011-05-30 发布日期:2011-05-30
基金资助:
国家自然科学基金项目（50908021），高校基本科研业务费专项基金资助项目（CHD2010JC044）

Analyses of Inner Air Void Characters in Composite Asphalt Concrete Based on CT Technology

WANG Zhen-Jun-a, SHA Ai-Min-a, b , XIAO Jing-Jing-b, JIANG Wei-b, WANG Rui-a

(a. School of Materials Science and Engineering; b. Key Laboratory of Highway Engineering in Special Regions of Ministry of Education, Chang’an University, Xi’an 710064, China)

Received:2010-10-15 Online:2011-05-30 Published:2011-05-30

摘要/Abstract

摘要： 摘要：采用X射线断层扫描（CT）技术分析了相同集料级配条件下，不同水泥和乳化沥青结合料用量混凝土的1~10层位空隙数量、空隙尺寸和空隙率等指标的变化规律，并结合扫描电子显微镜（SEM）分析其相关机理.结果表明：在相同条件下，复合沥青混凝土试件两端的空隙数量较多、尺寸大且空隙率较大，而中间部分则相反；复合沥青混凝土内部最大空隙率为10.1%；掺加水泥或采用适当添加量的乳化沥青，有利于降低混凝土的空隙率，当乳化沥青和水泥的质量分数分别为8.0%和3.0%时，混凝土的空隙率最小，仅为3.9%，且其空隙分布不均匀.

关键词: 复合沥青混凝土, X射线断层扫描技术, 结合料, 空隙特征

Abstract: X-ray computed tomography (CT) technology was adopted to analyze change rules of air void number, air void size and air void ratio of 1-10 slices in the concrete with the same aggregate gradation and scanning electron microscope (SEM) was used to analyze its mechanism. The results indicate that there are more air void numbers, larger air void size and higher air void ratio in the sides of the same concrete specimens, while they are the opposite in the middle. The highest air void ratio is 10.1%. The addition of ordinary Portland cement or the adoption of asphalt emulsion with optional dosage is helpful to decrease the air void ratio. There exists the lowest air void ratio, 3.9%, in the concrete when the dosage of asphalt emulsion and cement is 8.0% and 3.0% respectively. The air void distribution is inhomogeneous.

Key words: composite asphalt concrete, X-ray computed tomography (CT) technology, binders, air void characters

中图分类号:

U414

王振军a, 沙爱民a, b, 肖晶晶b, 蒋玮b, 王瑞a. 基于CT技术的复合沥青混凝土内部空隙特征分析[J]. 上海交通大学学报（自然版）, 2011, 45(05): 667-671.

WANG Zhen-Jun-a, SHA Ai-Min-a, b , XIAO Jing-Jing-b, JIANG Wei-b, WANG Rui-a. Analyses of Inner Air Void Characters in Composite Asphalt Concrete Based on CT Technology[J]. Journal of Shanghai Jiaotong University, 2011, 45(05): 667-671.

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