【摘要】：丁二烯和苯乙烯三元嵌段共聚物（SBS）改性瀝青混合料已大量用于高等級公路的建設(shè)。然而，SBS改性瀝青在環(huán)境因素的作用下發(fā)生老化，，易出現(xiàn)各種病害損壞路面，需要經(jīng)常進(jìn)行維護(hù)或維修。對受損嚴(yán)重路面的養(yǎng)護(hù)、修補(bǔ)或大修過程中，將產(chǎn)生大量的廢舊SBS改性瀝青混合料。為節(jié)約自然資源，保護(hù)環(huán)境，對廢舊SBS改性瀝青混合料進(jìn)行再生利用，是瀝青道路可持續(xù)發(fā)展的一項(xiàng)重要工作。根據(jù)以往經(jīng)驗(yàn)，對廢舊瀝青混合料最有效的再生方法是使用再生劑，但現(xiàn)有再生劑主要是針對普通混合料而研制的，所以它對普通瀝青混合料的再生效果良好，而不適合對SBS改性瀝青混合料再生。與普通瀝青的老化不同，SBS改性瀝青的老化不僅包含普通瀝青的老化，還包括SBS的老化；若要對SBS改性瀝青混合料進(jìn)行再生，則需同時(shí)對瀝青和SBS進(jìn)行再生，才能較全面地恢復(fù)SBS改性瀝青的性能。為制備性能優(yōu)良的SBS改性瀝青再生劑，本文采用催化裂化油漿、基質(zhì)瀝青和環(huán)氧化合物等制備了反應(yīng)型再生劑，并研究了環(huán)氧化合物對反應(yīng)型再生劑的物理性能、老化性能和再生性能的影響，以及反應(yīng)型再生劑摻量對老化SBS改性瀝青物理性能和流變性能的影響。利用動態(tài)剪切流變儀（DSR）研究了再生SBS改性瀝青的流變性能，用傅立葉變換紅外光譜儀（FTIR）和熒光顯微鏡分析了再生前后SBS改性瀝青的化學(xué)結(jié)構(gòu)和SBS在瀝青中分布狀態(tài)的變化情況。主要研究內(nèi)容和結(jié)論如下： （1）利用基質(zhì)瀝青、催化裂化油漿和不同環(huán)氧官能度的化合物制備了單環(huán)氧基、雙環(huán)氧基和多環(huán)氧基反應(yīng)型再生劑，再生劑的物理性能、老化性能均滿足國內(nèi)外相關(guān)再生劑規(guī)范的要求，并對老化SBS改性瀝青具有良好的再生效果。 （2）三種反應(yīng)型再生劑對老化SBS改性瀝青的粘度、針入度和延度等物理性能均有很好的恢復(fù)能力。不同的是延度恢復(fù)水平有一定的差異：當(dāng)環(huán)氧官能團(tuán)化合物摻量為5%時(shí)，單環(huán)氧官能團(tuán)反應(yīng)型再生劑（SR）和雙環(huán)氧官能團(tuán)反應(yīng)型再生劑（SDR）能分別將老化SBS改性瀝青的延度由1.2cm恢復(fù)到15cm和20cm，但多環(huán)氧官能團(tuán)反應(yīng)型再生劑（SDTR）卻能將老化SBS改性瀝青的延度由1.2cm恢復(fù)到26cm。 （3）反應(yīng)型再生劑對純老化SBS改性瀝青和新舊復(fù)合SBS改性瀝青都具有很好的再生效果，如9%的SDTR摻量可恢復(fù)新舊復(fù)配SBS改性瀝青的物理性能，11%的SDTR摻量也可基本恢復(fù)純老化SBS改性瀝青的物理性能。另外，隨著反應(yīng)型再生劑摻量的增加，再生SBS改性瀝青的粘度降低、針入度增大。 （4）DSR檢測發(fā)現(xiàn)，反應(yīng)型再生劑能夠降低老化SBS改性瀝青的復(fù)數(shù)模量，增大相位角，表明反應(yīng)型再生劑能夠較好地恢復(fù)老化SBS改性瀝青的粘彈特性。 （5）FTIR分析表明：老化后SBS改性瀝青中C=C雙鍵含量減小，C=O基含量增加；加入反應(yīng)型再生劑后，情況正好相反，即C=O基含量減少，C=C基相對含量增加。這是因?yàn)榉磻?yīng)型再生劑中的環(huán)氧基團(tuán)可與SBS的降解產(chǎn)物SB形成羧基反應(yīng)，使SB通過再生劑偶聯(lián)重新形成SBS，從而重建SBS的分子結(jié)構(gòu)，恢復(fù)老化SBS改性瀝青的性能。熒光顯微鏡觀察也表明再生改性瀝青中的SBS的微觀結(jié)構(gòu)得到了恢復(fù)。
[Abstract]:Butadiene and styrene block copolymer (SBS) modified asphalt mixture has been widely used in the construction of high-grade highway. However, SBS modified asphalt aging under the action of environmental factors, prone to a variety of diseases and damage of the road surface, need to be frequently maintained or repaired. In order to save natural resources and protect the environment, it is an important work for the sustainable development of asphalt pavement to recycle the waste SBS modified asphalt mixture. The SBS modified asphalt mixture is not suitable for SBS modified asphalt mixture. Unlike ordinary asphalt aging, SBS modified asphalt aging includes not only ordinary asphalt aging, but also SBS aging; if SBS modified asphalt mixture is to be regenerated, it is not suitable for SBS modified asphalt mixture. The performance of SBS modified asphalt can be restored completely only when asphalt and SBS are regenerated at the same time. In order to prepare SBS modified asphalt regenerant with good performance, the reactive regenerant was prepared by catalytic cracking slurry, matrix asphalt and epoxy compound, and the physical properties and aging of the reactive regenerant with epoxy compound were studied. The rheological properties of recycled SBS modified asphalt were studied by dynamic shear rheometer (DSR), and the modification of SBS modified asphalt before and after recycling was analyzed by Fourier transform infrared spectroscopy (FTIR) and fluorescence microscope. The structure and the distribution of SBS in asphalt are studied. The main contents and conclusions are as follows:
(1) Single epoxy, double epoxy and multi-epoxy reactive regenerants were prepared from base asphalt, catalytic cracking slurry and compounds with different epoxy functions. The physical properties and aging properties of the regenerants met the requirements of relevant regenerants at home and abroad, and the regenerated SBS modified asphalt had good regeneration effect.
(2) The physical properties of SBS modified asphalt, such as viscosity, penetration and ductility, can be restored well by the three kinds of reactive regenerants. The difference is that the recovery of ductility is different: when the content of epoxy functional group compound is 5%, the single epoxy functional group reactive regenerant (SR) and the double epoxy functional group reactive regenerant (SDR) can be restored well. The ductility of aging SBS modified asphalt can be restored from 1.2 cm to 15 cm and 20 cm, respectively, but the ductility of aging SBS modified asphalt can be restored from 1.2 cm to 26 cm by SDTR.
(3) Reactive regenerant has good regeneration effect on pure aging SBS modified asphalt and new-old SBS modified asphalt. For example, 9% SDTR can restore the physical properties of new-old SBS modified asphalt and 11% SDTR can basically restore the physical properties of pure aging SBS modified asphalt. The viscosity of recycled SBS modified asphalt decreases and penetration increases.
(4) DSR test showed that the reactive regenerant could reduce the complex modulus and increase the phase angle of the aged SBS modified asphalt, which indicated that the reactive regenerant could restore the viscoelastic properties of the aged SBS modified asphalt.
(5) FTIR analysis showed that the content of C=C double bond in SBS modified asphalt decreased and the content of C=O group increased after aging, but the content of C=O group decreased and the relative content of C=C group increased when the reactive regenerant was added. This was because the epoxy group in the reactive regenerant could react with SBS degradation product SB to form carboxyl group and make SB pass through the regenerant. Fluorescence microscopy also showed that the microstructure of SBS in recycled modified asphalt was restored.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U414

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