【作者】 范文孝；

【导师】 康海贵； 蔡迎春；

【作者基本信息】 大连理工大学 ， 港口海岸及近海工程， 2011， 博士

【摘要】 沥青路面因平整、舒适、噪音小等特点在高等级路面中得到了广泛的应用。但随着交通量和轴载的不断增大,沥青路面早期破坏现象日趋严重,对沥青混合料的路用性能提出了更高的要求。如何有效提高沥青路面的服务质量和使用寿命成为了广大道路工作者的研究重点。纤维作为一种新型的工程材料的添加剂和稳定剂,因其优良的路用性能以及施工简单、造价经济等特点在国内外引起了学者们的重视。玄武岩纤维作为继木质素纤维、聚合物纤维之后出现的又一种新型纤维,以其优良的技术性能受到人们的普遍关注。其不仅有效弥补了有机类纤维的强度与弹性模量低、耐高温性能差等缺点,同时也克服了石棉等矿物纤维存在污染环境的缺陷。本文在国内外已有研究成果的基础上,首先通过马歇尔试验与高温车辙试验确定最佳的沥青与纤维用量。然后通过高温稳定性、水稳定性试验、疲劳试验及低温抗裂试验研究了玄武岩纤维沥青混合料的路用性能,并与聚酯纤维混合料、木质素纤维混合料及无添加纤维混合料路用性能进行对比与分析。针对目前我国半刚性基层和底基层严重开裂现象,研究了玄武纤维的掺入对半刚性基层和底基层材料性能的改善情况。本文主要研究工作如下：(1)纤维沥青混合料马歇尔试验研究通过对不同纤维类型及纤维用量的沥青混合料马歇尔试验研究,分析了纤维对沥青混合料马歇尔试验结果影响的原因,分析了纤维沥青混合料马歇尔指标的变化规律,并确定了纤维沥青混合料的最佳油石比和纤维掺量。(2)纤维沥青混合料路用性能试验研究通过高温稳定性试验、水稳性试验、疲劳试验及低温抗裂性试验对不添加纤维、添加玄武岩纤维、添加聚酯纤维(polyester)以及添加木质纤维(nethyl cellulose)’隋况下的沥青混合料的路用性能进行了对比分析。研究表明,纤维沥青混合料在路用性能方面得到了明显的改良与优化；在保持最佳纤维掺量的情况下,玄武岩纤维对沥青混合料路用性能的增强效果更明显。(3)玄武纤维水泥稳定碎石(基层和底基层)材料性能试验采用不同配合比和纤维掺量,开展了玄武岩纤维水泥稳定碎石抗压强度、弯曲强度和韧性及疲劳特性、抗裂性能(干缩开裂和温度循环开裂)试验研究,结果表明玄武岩纤维在一定程度上能够改善水泥稳定碎石基层的路用性能。(4)玄武岩纤维增强半刚性沥青路面疲劳寿命预估研究为了验证玄武岩纤维增强半刚性沥青路面路用性能、提高其服务质量和延长其寿命的效果,在沥青面层掺入适量玄武岩纤维,进而对其疲劳寿命进行预估,并与普通半刚性沥青路面的疲劳寿命进行了对比验证。更多还原

【Abstract】 The asphalt pavement has been widely used in express highway for its merits of smooth, comfortable travel, low-noise and so on. However, early damage of asphalt pavement becomes more and more serious with the continued increasing of axle load and traffic; therefore, the pavement performance of asphalt mixture should be reinforced in some way to meet the need of traffic development. But how to effectively improve the asphalt pavement performance and then to improve the service quality and life of the asphalt pavement has been become the research emphasis of a great deal of road researchers. Fiber as a kind of new asphalt mixture additive and stabilizer has caused the scholars’attention and research in domestic and foreign because of their excellent performance, simple construction and economic cost. The basalt fiber which appears after the lignin fiber and polymer fiber, as a kind of new asphalt mixture addition fiber, has received people’s universal attention by its fine technical performance. Basalt fiber not only makes up for the drawback of low strength, elastic ratio and weak high temperature resistance of organic fibers, but also overcomes the drawback of environmental pollution of mineral fibers such as asbestos fiber.Based on available research findings of domestic and foreign, the optimum dosage of asphalt and fiber was firstly defined by Marshall test and rutting test in this paper. Then the pavement performance of basalt fiber asphalt mixture was studied by tests of high temperature stability test, water stability test and low temperature crack resistance test, moreover compared and evaluated with the pavement performance of polyester fiber, lignin fiber and control asphalt mixture. Aiming to severe cracking phenomenon of semi-rigid base and subbase in our country, the basalt fiber’s reinforced effects for semi-rigid base and subbase material pavement performance was studied in this paper. The major works of this paper can be obtained as follows:(1) Research of fiber asphalt mixture Marshall testThe different type, length, fineness and dosage of the fiber in asphalt mixture were studied by Marshall test, the influence factors of fiber to asphalt mixture Marshall test results were analyzed, then the variety laws of the fibrer asphalt mixture Marshall indexes was obtained, the best bitumen-aggregate ratio of asphalt and the best dosage of fiber were all decided..(2) Pavement performance test research of fiber-reinforced asphalt mixture Based on the Marshall test and rutting test, the best dosage of fiber and asphalt was identified. The pavement performances were analyzed and compared for control asphalt mixture, polyester fiber-reinforced asphalt, lignin fiber-reinforced asphalt mixture and basalt fiber-reinforced asphalt mixture by high temperature stability test, water stability test and low temperature crack resistance test. The results show that the pavement performance of fiber-reinforced asphalt mixture was improved significantly compared with that control asphalt mixture. Under the state of the optimal dosage of fiber, the reinforced effects of basalt fiber for asphalt mixture is better than that of polyester fiber and lignin fiber.(3) The pavement performance test of basalt fiber reinforced-cement stable crushed stone (base and subbase) materialIn order to study the pavement performance of basalt fiber-reinforced cement stable crushed stone, the compressive strength test, flexural strength and toughness test,fatigue characteristic test and cracking resistance (including shrinkage cracking and temperature cycling cracking) were done for different fiber dosage and various graded cement stable crushed stone material.(4) The life prediction of basalt fiber-reinforced semi-rigid AC pavementTo verify the reinforced effect of the basalt fiber to semi-rigid asphalt concrete pavement using life, the fatigue life prediction for semi-rigid AC pavement which surface incorporated with baslt fiber was done, what’s more, the predition results was compared to the ordinary semi-rigid asphalt pavement.更多还原