纤维对沥青混合料稳定性的影响研究

纤维在沥青混合料中的作用效果一直受到人们的关注,文中针对这一问题选用了四类纤维,分别采用普通沥青和改性沥青,选用沥青混合料AC-16I型,客观的分析了纤维沥青混合料的高温稳定性、低温稳定性、水稳定性和抗疲劳性能等路用性能。研究表明:纤维加入后,最佳沥青用量、空隙率、矿料间隙率、稳定度和流值均有不同程度增加,而密度下降;高温稳定性、低温抗裂性能、抗疲劳性能和耐水害性能等路用性能均有一定改善;其中高温和抗疲劳性能的改善最为显著,并且添加纤维的普通沥青混合料性能达到甚至超过改性沥青的性能,改性沥青再添加纤维性能将更好。

Study on Influence of Fiber to Stability of Asphalt Concrete Pavement

The effect of fiber in asphalt mixtures has attracted general concern.For study of this problem,four kinds of fibers are chosen in this test.Asphalt and modified asphalt are adopted in asphalt mixtures AC-16I.The road performance influenced by additional fiber was analyzed impersonally,i.e.the stability of asphalt concrete under high temperature condition,anti-crack ability under low temperature condition,the water resistance and fatigue performance.It was shown through the research that the optimum asphalt content,air void rate,clear-ance rate of the mineral powder,saturation degree,and the flow value were increased and the density was de-creased after adding the fiber.The road performance,such as the stability of asphalt concrete under high tem-perature condition,anti-crack ability under low temperature condition,water resistance and fatigue performance,was obviously improved,and the high temperature stability and fatigue performance improved most evidently.The fiber asphalt mixture performance reached and even exceeded the modified asphalt mixture performance.The modified asphalt performance after adding fiber would be improved more greatly.