【摘要】：溫拌再生技術(shù)是道路建設(shè)行業(yè)的一項新技術(shù),該項技術(shù)集溫拌技術(shù)和再生技術(shù)的優(yōu)點于一體。不僅可以降低制備和施工溫度,減緩新舊瀝青老化,而且使得廢舊瀝青混合料(reclaimed asphalt pavement, RAP)得到再生利用,節(jié)約資源。同時,對環(huán)境保護(hù)也是非常有益的。然而,溫拌再生技術(shù)特別是SMA類RAP相關(guān)溫拌再生技術(shù)仍處于理論研究階段,對溫拌劑和RAP綜合作用下,其性能變化規(guī)律,尤其是疲勞性能方面研究較少,從而導(dǎo)致相關(guān)技術(shù)的長期耐久性能不明確,因此急需進(jìn)行SMA類RAP溫拌再生技術(shù)的疲勞性能研究。 由于影響瀝青混合料疲勞的因素較多,為確定RAP等對SMA瀝青混合料疲勞性能的影響,在考慮到工程實際基礎(chǔ)上采用了兩種配合比設(shè)計方法。第一種是對集料按照各級篩孔進(jìn)行篩分,保證目標(biāo)級配的精確性。熱拌SMA瀝青混合料在0%RAP摻量下進(jìn)行配合比設(shè)計,確定級配和最佳油石比,并以此分別作為0%、20%和30%三種RAP摻量下的再生SMA瀝青混合料目標(biāo)級配和油石比；另外一種方法是考慮到工程實際,不對每檔集料進(jìn)行篩分。對0%、20%及30%三種RAP摻量下熱拌再生SMA瀝青混合料分別進(jìn)行配合比設(shè)計,確定各自級配和最佳油石比。最后在以上配合比設(shè)計的基礎(chǔ)上加入3%Sasobit,采用干拌法和濕拌法工藝對RAP進(jìn)行溫拌再生,并對各種SMA瀝青混合料進(jìn)行高溫、低溫和水穩(wěn)定性能驗證對比。 本文對上述集料篩分和集料不篩分兩種配合比設(shè)計中,RAP摻量在0%、20%及30%情況下,熱拌再生SMA瀝青混合料和兩種不同拌和方式(干拌法和濕拌法)Sasobit溫拌再生SMA瀝青混合料,進(jìn)行三種不同應(yīng)變水平下(750με,950με,1150με)的四點彎曲疲勞試驗,匯總勁度模量、疲勞壽命、累積耗散能及相位角等主要數(shù)據(jù),研究數(shù)據(jù)變化規(guī)律,并采用現(xiàn)象學(xué)方法和累積耗散能方法對試驗結(jié)果進(jìn)行分析,揭示各參數(shù)之間關(guān)系。 在對Sasobit溫拌再生SMA瀝青混合料疲勞數(shù)據(jù)研究的基礎(chǔ)上,從不同RAP摻量、不同瀝青混合料技術(shù)和不同拌和工藝角度,對Sasobit溫拌再生SMA瀝青混合料疲勞性能進(jìn)行分析,揭示RAP摻量、溫拌技術(shù)及溫拌工藝,對溫拌再生SMA瀝青混合料疲勞性能影響的規(guī)律。同時結(jié)合對影響瀝青混合料疲勞性能的內(nèi)部因素進(jìn)行分析,對比集料篩分和集料不篩分方法疲勞試驗結(jié)果,提出一些改善疲勞性能的措施。
[Abstract]:Warm mixing and recycling technology is a new technology in road construction industry, which integrates the advantages of warm mixing technology and regeneration technology. It can not only reduce the temperature of preparation and construction, slow down the aging of old and new asphalt, but also make the waste and old asphalt mixture (reclaimed asphalt pavement, RAP) recycled and save resources. At the same time, environmental protection is also very beneficial. However, the warm mix regeneration technology, especially the SMA RAP related warm mix regeneration technology, is still in the theoretical research stage. Under the combined action of warm mix agent and RAP, the performance change law, especially the fatigue property, is less studied. As a result, the long-term durability of related technologies is not clear, so it is urgent to study the fatigue performance of SMA type RAP warm mix regeneration technology. Because there are many factors affecting the fatigue of asphalt mixture, in order to determine the influence of RAP on the fatigue performance of SMA asphalt mixture, two mix ratio design methods are adopted on the basis of considering the engineering practice. The first is to sift aggregates according to different sieve holes to ensure the accuracy of target gradation. The mixture ratio of hot-mixed SMA asphalt mixture is designed under the 0%RAP content to determine the gradation and the optimum asphalt ratio, which is used as the target gradation and the oil stone ratio of the recycled SMA asphalt mixture with 0% and 30% RAP respectively. Another method is to not sift each aggregate in the light of engineering practice. The mixture ratio design of hot mix recycled SMA asphalt mixture with 20% and 30% RAP was carried out to determine their gradation and the optimum ratio of oil stone. Finally, on the basis of the above mix ratio design, add 3 Sasobit, adopt dry mixing process and wet mix process to regenerate RAP, and compare the high temperature, low temperature and water stability performance of various SMA asphalt mixture. In this paper, under the conditions of 20% and 30% SMA asphalt mixture, hot mix recycled SMA asphalt mixture and two different mixing methods (dry mixing and wet mixing) Sasobit warm mixed recycled SMA asphalt mixture were used in the mixture design of screening and non-sieving of aggregate and aggregates without sieving, and the content of rap was 20% and 30% respectively, and the content of rap was 20% and 30% respectively. Four point bending fatigue tests were carried out at three different strain levels (750 渭 蔚 -950 渭 蔚 -1150 渭 蔚). The main data such as stiffness modulus, fatigue life, cumulative dissipation energy and phase angle were summarized, and the variation of the data was studied. The phenomenological method and the cumulative dissipative energy method are used to analyze the experimental results and to reveal the relationship between the parameters. Based on the study of fatigue data of Sasobit warm mix recycled SMA asphalt mixture, this paper analyzes the fatigue performance of Sasobit warm mix recycled SMA asphalt mixture from different RAP content, different asphalt mixture technology and different mixing technology, and reveals the content of RAP. The effect of warm mixing technology and warm mixing technology on fatigue performance of warm mix recycled SMA asphalt mixture. At the same time, the internal factors affecting the fatigue performance of asphalt mixture are analyzed, and some measures to improve the fatigue performance are put forward by comparing the fatigue test results of aggregate screening method and aggregate non-sieving method.
【學(xué)位授予單位】：北京建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U414

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