|
|
|
| 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) |
|
|
|
|
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.
|
|
Received: 15 October 2010
Published: 30 May 2011
|
|
|
|
|
|
| No related articles found! |
|
|
|
|
