特种玄武岩纤维增强OGFC配合比设计及性能研究

发布时间：2018-10-21 08:07

【摘要】：为了提高大交通量和复杂环境条件下沥青路面的使用性能和耐久性,常采用短切矿物纤维增强沥青混凝土,但是絮状矿物纤维的应用较少,有待深入研究。为此,选定开级配排水式磨耗层沥青混合料OGFC-13,通过大量室内试验开展絮状特种玄武岩纤维增强沥青混合料的配合比设计及性能研究,以供高性能、排水降噪路面的工程应用参考。(1)沥青、粗集料、细集料和填料等原材料的性能检验结果表明各项技术指标均满足规范要求。特种玄武岩纤维检验结果显示,纤维直径为3~6μm,吸油率达到73%,明显大于短切玄武岩纤维吸油率50%的要求,表明特种玄武岩纤维极细,比表面积大,对沥青的吸附能力强。(2)通过OGFC-13配合比设计,得到特种玄武岩纤维掺量为0.0%、0.3%、0.4%、0.5%和0.6%的最佳油石比别为4.2%、4.5%、4.6%、4.5%和4.3%,岩纤维掺量与最佳油石比之间呈抛物线关系变化,表明过多的纤维会填充OGFC-13的空隙而导致最佳油石比降低。通过最佳油石比下马歇尔和析漏飞散试验,发现随岩纤维掺量增加VV与连通空隙率VE与VMA而减小,MS和FL在0.4%纤维掺量时达到峰值,较未掺纤维的分别增加19.7%和12.6%;析漏与飞散损失较零掺量时减小,其中飞散损失ΔS在0.4%纤维掺量减小最多,达30.7%。(3)通过室内路用性能检验,发现特种玄武岩纤维的掺入,明显地改善了OGFC-13的路用性能。其中,纤维掺量为0.4%时,改善效果最佳,DS、?b、MS0和TSR分别提高了60.2%、44.5%、9.3%和6.3%,同时具有良好的排水性能和优良的抗滑性能。为此,确定0.4%掺量为最佳岩纤维掺量。(4)通过与不同级配的沥青混合料进行路用性能对比发现,最佳配合比下的特种玄武岩纤维OGFC-13具有优良的路用性能,由此,综合试验结果与相关技术规范提出了特种玄武岩纤维OGFC-13的性能技术指标。总之,本文提出的特种玄武岩纤维增强OGFC-13沥青混合料可用于沥青路面排水式磨耗层。
[Abstract]:In order to improve the performance and durability of asphalt pavement under large traffic volume and complex environment, short cut mineral fiber is often used to reinforce asphalt concrete, but the application of flocculating mineral fiber is less, which needs further study. For this reason, OGFC-13, of open-graded drainage wear layer asphalt mixture is selected to design and study the mixture ratio and performance of flocculating special basalt fiber reinforced asphalt mixture through a large number of laboratory tests, in order to provide high performance. Reference for the engineering application of drainage and noise reduction pavement. (1) the performance test results of raw materials such as asphalt, coarse aggregate, fine aggregate and filler show that each technical index meets the requirements of specifications. The test results of special basalt fiber show that the fiber diameter is 3 ~ 6 渭 m and the oil absorption rate is 73, which is obviously larger than the requirement of 50% oil absorption rate of short cut basalt fiber, which indicates that the special basalt fiber is very fine and has a large specific surface area. The adsorption ability of asphalt is strong. (2) through the OGFC-13 mix ratio design, it is obtained that the optimum oil stone ratio of the special basalt fiber is 0.00.30.40% and 0.6% is 4.22% 4.65% and 4.35%, and the relationship between the content of rock fiber and the optimum ratio of oil and stone is parabola. It is shown that too much fiber will fill the void of OGFC-13 and result in the decrease of the optimum oil / stone ratio. Through the Marshall and leakage dispersion tests under the optimum petrol-stone ratio, it is found that with the increase of rock fiber content, VV and connected porosity VE and VMA decrease, and MS and FL reach the peak value at 0.4% fiber content. Compared with the undoped fibers, the loss of leakage and dispersion decreased by 19.7% and 12.6.The loss of dispersion 螖 S decreased most at 0.4% fiber content, and reached 30.7%. (3) the incorporation of special basalt fibers was found through indoor road performance tests. The road performance of OGFC-13 is improved obviously. When the fiber content is 0.4, the effect is the best. The DS,?b,MS0 and TSR are increased by 60.2% and 6.3%, respectively, and have good drainage performance and good skid resistance. Therefore, 0.4% content is determined as the best content of rock fiber. (4) by comparing the road performance of asphalt mixture with different grade asphalt mixture, it is found that the special basalt fiber OGFC-13 with the best mix ratio has excellent road performance. Based on the experimental results and relevant technical specifications, the performance and technical indexes of special basalt fiber OGFC-13 are proposed. In a word, the special basalt fiber reinforced OGFC-13 asphalt mixture proposed in this paper can be used in the drainage wear layer of asphalt pavement.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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