發(fā)布時(shí)間：2018-03-27 11:07

  本文選題：改性瀝青　切入點(diǎn)：宏觀性能　出處：《揚(yáng)州大學(xué)》2014年碩士論文

【摘要】：改性瀝青以其優(yōu)良的使用性能而得到了廣泛的應(yīng)用,作為一種混合體系,改性瀝青是聚合物溶脹于瀝青中,從而將聚合物的性能傳遞到瀝青中去,其宏觀性能上表現(xiàn)出來的不同,究其根本都是改性劑在瀝青中的相態(tài)、形狀、尺寸和均勻性等微觀形態(tài)共同作用的結(jié)果。因此,對改性瀝青的顯微結(jié)構(gòu)加以研究,揭示其微觀結(jié)構(gòu)與宏觀性能的相互關(guān)系已勢在必行。 本研究在前期研究基礎(chǔ)之上從剪切時(shí)間、溶脹時(shí)間兩個(gè)方面考察了制備工藝參數(shù)對SBS改性瀝青技術(shù)指標(biāo)的影響。在延長剪切時(shí)間及溶脹時(shí)間的條件下揭示宏觀性能和微觀參數(shù)的聯(lián)系,并探尋相容性SBS改性瀝青微觀特征的描述方法。得到如下研究成果： 通過延長剪切時(shí)間發(fā)現(xiàn)SBS改性瀝青軟化點(diǎn)、粘度、復(fù)數(shù)模量逐漸呈現(xiàn)緩慢上升的趨勢。相容后數(shù)值保持穩(wěn)定,波動(dòng)幅度較小,對于金陵70#道路石油瀝青,在3%-9%摻量下,星型SBS比線型SBS相容性略好,推薦兩種改性瀝青剪切時(shí)間為90min。改性瀝青共混的分散過程是一個(gè)動(dòng)態(tài)平衡過程,在改性瀝青達(dá)到相容之后仍在繼續(xù)進(jìn)行；改性瀝青顯微形態(tài)的參數(shù)一直處于周期性波動(dòng)之中,后期周期時(shí)間縮短。 溶脹工藝使得線型SBS改性瀝青在同等剪切時(shí)間下軟化點(diǎn)、粘度、復(fù)數(shù)模量均有所增加,相對于星型結(jié)構(gòu)其更容易發(fā)生溶脹,推薦溶脹時(shí)間為60min;而對于星型結(jié)構(gòu)SBS,軟化點(diǎn)增加幅度明顯,粘度、復(fù)數(shù)模量數(shù)值下降。 改性瀝青達(dá)到相容之前,性能波動(dòng)較大,即使是達(dá)到相容之后,最終可以趨于穩(wěn)定。其改性劑面積百分率及平均面積在達(dá)到相容后波動(dòng)幅度較小,聚合物尺寸分布更為均勻,改性瀝青聚合物的分布以聚集分布為主；長短軸之比及其標(biāo)準(zhǔn)差在剪切過程中均呈現(xiàn)的周期性波動(dòng),波動(dòng)幅度較大。 其次采用回歸分析對改性瀝青微觀參數(shù)和宏觀性能的關(guān)系進(jìn)行擬合,兩種改性瀝青的性能與顯微形態(tài)結(jié)構(gòu)之間均呈現(xiàn)出較好的相關(guān)關(guān)系。 對于回歸方程擬合的相關(guān)性大小,本文采用灰色系統(tǒng)關(guān)聯(lián)度進(jìn)行驗(yàn)證,研究結(jié)果表明：星型結(jié)構(gòu)SBS改性瀝青宏觀性能與平均面積、面積百分率的相關(guān)性更優(yōu)、關(guān)聯(lián)度也更好,線型SBS改性瀝青宏觀性能與顆粒長短軸之比、長短軸之比標(biāo)準(zhǔn)差相關(guān)性以及關(guān)聯(lián)度要優(yōu)于平均面積、面積百分率。星型結(jié)構(gòu)SBS改性瀝青宏觀與微觀參數(shù)整體擬合度優(yōu)于線型結(jié)構(gòu)SBS改性瀝青。
[Abstract]:Modified asphalt has been widely used because of its excellent performance. As a mixed system, modified asphalt is polymer swelling in asphalt, so the performance of polymer is transferred to asphalt. The difference in its macroscopic performance is basically the result of the interaction of the phase state, shape, size and uniformity of the modifier in the asphalt. Therefore, the microstructure of the modified asphalt is studied. It is imperative to reveal the relationship between microstructure and macroscopic performance. This study is based on previous studies from the shear time, The influence of preparing process parameters on the technical indexes of SBS modified asphalt was investigated from two aspects of swelling time. The relationship between macroscopic properties and microscopic parameters was revealed under the condition of prolonging shear time and swelling time. The method of describing the microcosmic characteristics of SBS modified asphalt is explored. The results are as follows:. The softening point, viscosity and complex modulus of SBS modified asphalt were found to be increasing slowly by prolonging the shear time, and the values remained stable after compatibility, and the fluctuation was relatively small. For Jinling 70# road petroleum asphalt, 3- 9% was added to the asphalt. The compatibility of star SBS is better than that of linear SBS, and it is recommended that the shear time of the two modified asphalt is 90 min. The dispersing process of modified asphalt blend is a dynamic equilibrium process, which is still going on after the modified asphalt is compatible. The parameters of micromorphology of modified asphalt have been fluctuating periodically and the period of later period has been shortened. The swelling process results in the increase of softening point, viscosity and complex modulus of linear SBS modified asphalt at the same shear time, which is more likely to occur swelling than that of star structure. It is recommended that the swelling time be 60 min, while for star structure SBS, the softening point increases obviously, the viscosity and the complex modulus decrease. Before the modified asphalt reaches the compatibility, the performance fluctuates greatly, even after it reaches the compatibility, it can eventually become stable. The area percentage and the average area of the modifier are smaller after the compatibilization, and the size distribution of the polymer is more uniform. The main distribution of modified asphalt polymer is aggregation distribution, and the ratio of long and short axis and its standard deviation fluctuate periodically in the shear process, and the fluctuation range is large. Secondly, regression analysis was used to fit the relationship between the microcosmic parameters and macroscopic properties of modified asphalt. The relationship between the performance and microstructure of modified asphalt showed a good correlation. The correlation of regression equation fitting is verified by grey system correlation degree. The results show that the correlation between macroscopic performance and average area, area percentage of star SBS modified asphalt is better, and the correlation degree is better. The ratio of macroscopic properties of linear SBS modified asphalt to the long and short axis of particles, the correlation of the ratio standard deviation of the long and short axis and the correlation degree are better than the average area. Area percentage. The overall fitting of macroscopic and microscopic parameters of star-shaped SBS modified asphalt is better than that of linear SBS modified asphalt.
【學(xué)位授予單位】：揚(yáng)州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U414

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