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  本文關鍵詞：TLA改性瀝青及其混合料老化特性和機理研究　出處：《廣西大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： TLA改性瀝青 老化 動力學方程 機理 MTS疲勞試驗

【摘要】：特立尼達湖瀝青(TLA)是天然形成的物質,其經(jīng)過了億萬年地殼壓力和溫度的作用,已經(jīng)充分氧化沉淀,性質穩(wěn)定。TLA的摻入對普通石油瀝青混合料路用性能(高溫穩(wěn)定性、低溫抗裂性以及水穩(wěn)定性)有明顯改善作用。但是,摻入TLA對瀝青及其混合料抗老化性能的研究較少,現(xiàn)有的老化評價體系對TLA改性瀝青的適用性也有待探討。因此,為了提高TLA改性瀝青路面的使用壽命,進一步促進TLA改性瀝青的推廣應用與發(fā)展,本文著重對TLA改性瀝青及其混合料的老化特性和機理進行深入研究。采用旋轉薄膜烘箱(RTFOT)、壓力老化儀(PAV)研究TLA改性瀝青在不同老化溫度、時間以及老化方式下三項常規(guī)指標、旋轉粘度以及流變性能的變化規(guī)律。試驗結果表明,三種老化因素均對TLA改性瀝青各項性能有較為顯著的影響,與基質瀝青相比,不同老化方式下TLA改性瀝青抗老化性能更為優(yōu)異。采用動態(tài)剪切流變儀(DSR)對瀝青老化前后的動態(tài)流變特性進行測試,并以64℃時的復合模量G*為參數(shù)建立瀝青的動力老化方程,通過熱力學方法比較兩種瀝青抗老化性能的差異。結果表明,TLA改性瀝青具有較高的活化能,摻入25%TLA后活化能提高了12.8%,化學反應速率較基質瀝青小,性質更穩(wěn)定。通過紅外光譜(IR)分析技術,對TLA改性瀝青老化前后化學結構的變化進行分析,研究TLA改性瀝青老化機理。結果表明,摻入TLA為物理改性,并沒有產生新的特征吸收峰,TLA帶入的萘官能團和季銨基團對瀝青抗氧化性能有明顯改善作用,改性瀝青制備過程存在一定程度的老化,隨著老化程度的加深羰基和亞砜指數(shù)均增大,相比之下TLA改性瀝青增加幅度較小。從浸水馬歇爾試驗和劈裂疲勞試驗入手,研究老化時間、溫度及粗集料含量對瀝青混合料老化性能的影響。結果表明,三種因素均對水穩(wěn)定性和疲勞性能有顯著影響,而粗集料含量多的混合料更容易加速老化的作用,疲勞裂縫更傾向于沿著內部空隙發(fā)展。
[Abstract]:Trinidad Lake Asphalt (TLA) is a natural form of the material, after millions of years of crustal pressure and temperature effect, fully oxidation precipitation, stable properties of doped.TLA on the performance of common asphalt mixture (high temperature stability, low temperature crack resistance and water stability) have obvious improvement. However, doping the study of TLA anti aging performance of asphalt and its mixture less, existing aging evaluation system on the applicability of TLA modified asphalt has yet to be discussed. Therefore, in order to improve the TLA modified asphalt pavement service life, further promote the development and application of TLA modified asphalt, this paper focuses on the in-depth study of aging characteristics TLA modified asphalt and its mixture and mechanism. The rotating thin film oven aging instrument (RTFOT), pressure (PAV) on TLA modified asphalt at different aging temperature, aging time and mode of three conventional means Standard, rotational viscosity and rheological properties were studied. Experimental results show that the three aging factors of TLA modified asphalt have remarkable influence on the performance, compared with matrix asphalt under different aging TLA modified asphalt anti-aging performance is more excellent. By using dynamic shear rheometer (DSR) test the dynamic rheological properties of asphalt after aging, and the composite modulus G* to 64 DEG C for the establishment of dynamic parameters of asphalt aging equation, difference by thermodynamic method anti aging performance comparison of two kinds of asphalt. The results show that the activation energy of TLA modified asphalt with high doped 25%TLA, the activation energy increased by 12.8%, chemical reaction the rate is better than the matrix asphalt, more stable in nature. By infrared spectroscopy (IR) analysis technology of TLA modified asphalt chemical structure changes before and after aging were analyzed on TLA modified asphalt aging mechanism. The results show that, The incorporation of TLA into physical modification, and did not produce new absorption peaks of naphthalene groups and quaternary ammonium groups into the TLA had a significant effect on improving the oxidation resistance of asphalt, modified asphalt preparation process has a certain degree of aging, are increasing with the aging extent of the carbonyl and sulfoxide index, compared with TLA asphalt increased to a lesser extent. From the immersion Marshall test and splitting fatigue test research of aging time, temperature and content of coarse aggregate material affect the aging properties of asphalt mixture. The results showed that all the three factors have significant influence on water stability and fatigue resistance, and the mixture of coarse aggregate content and more to accelerate the aging effect, fatigue cracks tend to develop along the inner space.

【學位授予單位】：廣西大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U414

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本文編號：1374060