本文選題：基質(zhì)瀝青 + 損傷愈合能力　； 參考：《湖南大學(xué)》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?yàn)闉r青這種特殊的粘彈性材料的存在。因此從瀝青層面上對(duì)其損傷愈合性能進(jìn)行分析是對(duì)瀝青混合料進(jìn)行研究的基礎(chǔ)，且更具有可行性。本文在借鑒前人已有研究成果的基礎(chǔ)上，從最基本的基質(zhì)瀝青出發(fā)，嘗試以不同試驗(yàn)方法來對(duì)其自身具備的損傷愈合性能及損傷愈合機(jī)理進(jìn)行研究，并探討了外加劑對(duì)于瀝青損傷愈合性能的影響。 （1）在充分學(xué)習(xí)、借鑒前人對(duì)瀝青損傷愈合性能的研究成果的基礎(chǔ)上，分析并總結(jié)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(yàn)方法。 （2）采用延性拉伸愈合（DTH）試驗(yàn)方法，以在一定條件下恢復(fù)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(píng)價(jià)指標(biāo)，比較不同影響因素對(duì)基質(zhì)瀝青損傷愈合性能的影響。 （3）引入雙片組愈合（TPH）試驗(yàn)，采用動(dòng)態(tài)剪切流變儀(DSR)對(duì)純?yōu)r青的損傷愈合能力進(jìn)行研究。試驗(yàn)過程中，將兩片獨(dú)立的瀝青片放置在儀器平行的兩端，通過擠壓調(diào)整試件間距來模擬愈合過程，，試驗(yàn)將雙片組試件的愈合過程劃分為初始愈合階段和時(shí)間依賴愈合階段，試驗(yàn)結(jié)果總結(jié)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(gè)階段；（b）在時(shí)間依賴愈合階段，兩種模式下即間距保持不變模式和應(yīng)力保持不變模式下，試驗(yàn)結(jié)果有很大的差異，試驗(yàn)結(jié)果顯示，壓應(yīng)力對(duì)損傷試件的愈合促進(jìn)扮演著很重要的角色；（c）對(duì)可能影響試驗(yàn)結(jié)果的一些因素進(jìn)行了探討。 （4）通過SBS改性瀝青的延性拉伸愈合（DTH）試驗(yàn)，證實(shí)SBS改性瀝青同樣能實(shí)現(xiàn)損傷愈合，愈合程度跟恢復(fù)時(shí)間和恢復(fù)溫度有關(guān)。在同等條件下，本次試驗(yàn)所采用的SBS改性瀝青恢復(fù)狀況不如基質(zhì)瀝青。通過雙片組愈合（TPH）試驗(yàn)，證實(shí)在粉膠比為1.0，以復(fù)模量比為唯一評(píng)價(jià)指標(biāo)，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(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U414

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