【摘要】：為了提高大交通量和復(fù)雜環(huán)境條件下瀝青路面的使用性能和耐久性,常采用短切礦物纖維增強(qiáng)瀝青混凝土,但是絮狀礦物纖維的應(yīng)用較少,有待深入研究。為此,選定開級(jí)配排水式磨耗層瀝青混合料OGFC-13,通過大量室內(nèi)試驗(yàn)開展絮狀特種玄武巖纖維增強(qiáng)瀝青混合料的配合比設(shè)計(jì)及性能研究,以供高性能、排水降噪路面的工程應(yīng)用參考。(1)瀝青、粗集料、細(xì)集料和填料等原材料的性能檢驗(yàn)結(jié)果表明各項(xiàng)技術(shù)指標(biāo)均滿足規(guī)范要求。特種玄武巖纖維檢驗(yàn)結(jié)果顯示,纖維直徑為3~6μm,吸油率達(dá)到73%,明顯大于短切玄武巖纖維吸油率50%的要求,表明特種玄武巖纖維極細(xì),比表面積大,對(duì)瀝青的吸附能力強(qiáng)。(2)通過OGFC-13配合比設(shè)計(jì),得到特種玄武巖纖維摻量為0.0%、0.3%、0.4%、0.5%和0.6%的最佳油石比別為4.2%、4.5%、4.6%、4.5%和4.3%,巖纖維摻量與最佳油石比之間呈拋物線關(guān)系變化,表明過多的纖維會(huì)填充OGFC-13的空隙而導(dǎo)致最佳油石比降低。通過最佳油石比下馬歇爾和析漏飛散試驗(yàn),發(fā)現(xiàn)隨巖纖維摻量增加VV與連通空隙率VE與VMA而減小,MS和FL在0.4%纖維摻量時(shí)達(dá)到峰值,較未摻纖維的分別增加19.7%和12.6%;析漏與飛散損失較零摻量時(shí)減小,其中飛散損失ΔS在0.4%纖維摻量減小最多,達(dá)30.7%。(3)通過室內(nèi)路用性能檢驗(yàn),發(fā)現(xiàn)特種玄武巖纖維的摻入,明顯地改善了OGFC-13的路用性能。其中,纖維摻量為0.4%時(shí),改善效果最佳,DS、?b、MS0和TSR分別提高了60.2%、44.5%、9.3%和6.3%,同時(shí)具有良好的排水性能和優(yōu)良的抗滑性能。為此,確定0.4%摻量為最佳巖纖維摻量。(4)通過與不同級(jí)配的瀝青混合料進(jìn)行路用性能對(duì)比發(fā)現(xiàn),最佳配合比下的特種玄武巖纖維OGFC-13具有優(yōu)良的路用性能,由此,綜合試驗(yàn)結(jié)果與相關(guān)技術(shù)規(guī)范提出了特種玄武巖纖維OGFC-13的性能技術(shù)指標(biāo)�？傊�,本文提出的特種玄武巖纖維增強(qiáng)OGFC-13瀝青混合料可用于瀝青路面排水式磨耗層。
[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.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U414

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