间断级配纤维微表处性能及指标研究

来源期刊:中南大学学报(自然科学版)2016年第9期

论文作者:张争奇 姚晓光 罗要飞 张苛

文章页码:3264 - 3273

关键词:道路工程;间断级配;纤维微表处;汉堡车辙试验

Key words:road engineering; gap-graded; fiber micro-surfacing; hamburg wheel tracking test

摘    要:为研究纤维种类、级配类型对微表处抗车辙及抗裂性能的影响情况,选用2种纤维、3种级配进行试验研究。在不同搭配情况下,利用汉堡车辙仪分别进行空气浴和水浴条件下的车辙试验,确定荷载作用6 000次后的车辙深度作为微表处抗车辙性能评价指标,指出蠕变速率评价指标的不足;并基于抗裂性能试验,提出疲劳断裂寿命指标。研究结果表明:随着荷载作用次数的增加,不同类型微表处抗车辙性能均会明显下降,在水浴情况下尤为显著,其中MS-3型聚丙烯纤维微表处最为典型,但其抗裂效果最优;间断级配纤维微表处也能满足规范要求,甚至更优,建议2种纤维的质量分数为0.10%。

Abstract: In order to study the influence of fiber type and gradation type on the anti-rutting and cracking resistance performance, two kinds of fibers and three kinds of gradations were selected. With different circumstances, the rutting tests were conducted by Hamburg wheel tracking test in the air and in the water respectively. The rut depth after loading 6 000 times was set as an evaluation indicator to evaluate anti-rutting performance, and the defects of creep rate indicator were pointed out. Then fatigue fracture life indicator was proposed based on the crack resistance test. The results show that the anti-rutting performances of different micro-surfacings all decrease significantly with the increase of loading times, especially in the water. And the anti-rutting performance of MS-3 graded polypropylene fiber micro-surfacing is the most typical. However, its cracking resistance performance is the best. The gap-graded fiber micro-surfacing can meet the requirements of specification and even better. The mass fraction of two kinds of fibers is suggested to be 0.10%.

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