中文摘要：

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.

英文摘要：

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.