| 摘要: |
| 采用自行研发的道路材料冲刷试验仪，开展了3类半刚性基层材料7，28，90d龄期的室内冲刷试验，得到了标准冲刷次数、冲刷动水压力以及劈裂强度之间的关系式.研究发现： 随着龄期增长，材料的抗冲刷系数有下降的趋势，冲刷应力比指数变化较小，大致在18左右，冲刷深度指数受冲刷动水压力和龄期影响较小，在1.8左右；冻融对材料的抗冲刷系数、冲刷应力比指数的影响可予忽略，材料抗冲刷性能的下降可归结于结构强度的下降.另外，反映砂浆黏结作用的劈裂强度较抗压强度与材料的冲刷抗力有更好的相关性. |
| 关键词: 路面工程 半刚性基层材料 标准冲刷次数 冻融 劈裂强度 |
| DOI：10.3969/j.issn.1007 9629.2013.04.010 |
| 分类号: |
| 基金项目:交通运输部西部交通建设科技项目(200731822301 9) |
|
| Experimental Research on Erosion ResistancePerformances of Semi rigid Base Materials |
|
ZHU Tang liang, TAN Zhi ming, ZHOU Yu min
|
|
Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 201804, China
|
| Abstract: |
| A new digital testing equipment for pavement materials was developed. By using this equipment, the erosion performance for 3 types of semi rigid base materials with 7, 28 and 90d were studied. The relationship among standard erosion times, hydrodynamic pressure and splitting strength were established. It is found that with the increase of aging time, the anti erosion factor decreased, whereas the erosion stress ratio index changed slightly, the mean value is about 18, and both the aging time and hydrodynamic pressure have insignificant influence on the erosion depth index, the average is around 1.8. The experimental results show that freezing and thawing have little effects on the anti erosion factor and erosion stress ratio index of the material, the drop of erosion resistance performances of base material can be attributed to the decrease of the structure strength. Moreover, the splitting strength of semi rigid base material which can better reflect the bond effect of mortar rather than its compressive strength is much more closely related to its erosion resistance performance. |
| Key words: pavement engineering semi rigid base material standard erosion times freezing and thawing splitting strength |
