本文選題：基質瀝青 + 損傷愈合能力　； 參考：《湖南大學》2014年碩士論文

【摘要】：從源頭上看，瀝青混合料之所以具有損傷愈合性能是因為瀝青這種特殊的粘彈性材料的存在。因此從瀝青層面上對其損傷愈合性能進行分析是對瀝青混合料進行研究的基礎，且更具有可行性。本文在借鑒前人已有研究成果的基礎上，從最基本的基質瀝青出發(fā)，嘗試以不同試驗方法來對其自身具備的損傷愈合性能及損傷愈合機理進行研究，并探討了外加劑對于瀝青損傷愈合性能的影響。 （1）在充分學習、借鑒前人對瀝青損傷愈合性能的研究成果的基礎上，分析并總結了影響瀝青損傷愈合性能的主要因素、影響效果和研究試驗方法。 （2）采用延性拉伸愈合（DTH）試驗方法，以在一定條件下恢復后的瀝青試件拉伸長度與原狀試件的拉伸長度比作為愈合率的評價指標，比較不同影響因素對基質瀝青損傷愈合性能的影響。 （3）引入雙片組愈合（TPH）試驗，采用動態(tài)剪切流變儀(DSR)對純?yōu)r青的損傷愈合能力進行研究。試驗過程中，將兩片獨立的瀝青片放置在儀器平行的兩端，通過擠壓調整試件間距來模擬愈合過程，，試驗將雙片組試件的愈合過程劃分為初始愈合階段和時間依賴愈合階段，試驗結果總結如下：（a）在初始愈合階段，隨著間距縫隙的逐漸減少，試件模量的增長可以劃分為三個階段；（b）在時間依賴愈合階段，兩種模式下即間距保持不變模式和應力保持不變模式下，試驗結果有很大的差異，試驗結果顯示，壓應力對損傷試件的愈合促進扮演著很重要的角色；（c）對可能影響試驗結果的一些因素進行了探討。 （4）通過SBS改性瀝青的延性拉伸愈合（DTH）試驗，證實SBS改性瀝青同樣能實現損傷愈合，愈合程度跟恢復時間和恢復溫度有關。在同等條件下，本次試驗所采用的SBS改性瀝青恢復狀況不如基質瀝青。通過雙片組愈合（TPH）試驗，證實在粉膠比為1.0，以復模量比為唯一評價指標，瀝青膠漿的愈合性能不如純?yōu)r青試件。
[Abstract]:From the source, the asphalt mixture has the damage healing property because of the existence of asphalt as a special viscoelastic material. Therefore, the analysis of its damage healing performance from the asphalt layer is the basis of the study of asphalt mixture, and is more feasible. Based on the previous research results and the most basic asphalt matrix, this paper attempts to study its own damage healing performance and mechanism with different test methods. The effect of admixture on asphalt damage healing performance was also discussed. 1) on the basis of fully studying and referring to the previous research achievements on asphalt damage healing performance, this paper analyzes and summarizes the main factors affecting asphalt damage healing performance, the effects and experimental methods. (2) using the method of ductile tensile healing (DTH) test, the ratio of tensile length of asphalt specimen recovered under certain conditions to that of undisturbed specimen is taken as the evaluation index of healing rate. The effects of different factors on the damage healing performance of asphalt matrix were compared. The damage healing ability of pure asphalt was studied by using dynamic shear rheometer (DSRs). During the experiment, two independent bitumen sheets were placed at the parallel ends of the instrument, and the healing process was simulated by squeezing and adjusting the spacing of the specimens. The healing process of the two groups of specimens was divided into the initial healing stage and the time-dependent healing stage. The experimental results are summarized as follows: (1) in the initial healing stage, with the decrease of gap spacing, the increase of specimen modulus can be divided into three stages: 1) in the time dependent healing stage, There are great differences between the two modes, that is, the interval invariant mode and the stress invariant mode. The experimental results show that, Compressive stress plays an important role in promoting the healing of damaged specimens. 4) through the ductile tensile healing test of SBS modified asphalt, it is proved that SBS modified asphalt can also achieve damage healing, and the healing degree is related to recovery time and recovery temperature. Under the same conditions, the SBS modified asphalt used in this experiment is not as good as the base asphalt. The results of TPH test show that when the ratio of powder to binder is 1.0 and the ratio of complex modulus is the only index, the healing performance of asphalt mortar is not as good as that of pure asphalt sample.
【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U414

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