【摘要】：聚合物SBS改性瀝青憑借突出的高溫性能、低溫性能、彈性恢復(fù)性能及感溫性能,在高等級公路建設(shè)中得到廣泛應(yīng)用。但是,由于當前國內(nèi)外仍沒有標準、快速、精確的檢測方法用于SBS摻量檢測,無法做到改性瀝青中SBS真實摻量的即時監(jiān)管,嚴重影響了質(zhì)量管理人員對SBS改性瀝青路用性能的真實、客觀評價。本課題組中南大學朱自強、劉正春教授等人在分析總結(jié)前人研究成果后,基于SBS分子碳碳雙鍵加成氧化特性,提出了通過加成氧化還原反應(yīng)方法來精確計量碳碳雙鍵數(shù)量�；谶@一思想,SBS課題組經(jīng)反復(fù)試驗研究提出了一套SBS含量檢測新方法,即“SBS摻量電化學分析法”。該檢測法的核心原理是用已知量的加成試劑與瀝青中SBS發(fā)生加成反應(yīng),再通過氧化還原滴定試驗求得加成試劑的消耗量,從而間接性求出瀝青中SBS的數(shù)量。SBS含量電化學分析法能夠穩(wěn)定、快速、精確的實現(xiàn)SBS摻量檢測,檢測精度可達±0.1%。針對不同SBS種類、摻量及各種外摻劑,設(shè)計實驗制備多種配比的改性瀝青,通過實驗論證了“SBS含量電化學分測法”的適用性。試驗結(jié)果表明該檢測方法能夠精確檢測各種配比改性瀝青中的SBS摻量,有著很好的適用性;此外還分析了增容劑、穩(wěn)定劑、納米蒙脫土等添加劑對檢測精度的影響,確保了該檢測方法在實際工程應(yīng)用中能獲得準確的檢測結(jié)果�；赟BS摻量電化學分析法,選取三組成品改性瀝青做儲存穩(wěn)定性評價。對離析試樣上下部瀝青做軟化點測試、SBS含量檢測及動態(tài)剪切流變(DSR)試驗(測試車轍因子,計算瀝青離析率),結(jié)合軟化點差、SBS含量、離析率三相指標綜合評價三組成品瀝青的儲存穩(wěn)定性。試驗結(jié)果表明:離析軟化點試驗?zāi)茌^好評價線型SBS改性瀝青的儲存穩(wěn)定性,但對星型SBS改性瀝青離析程度評價存在較大誤差;SBS摻量電化學分析法可直接檢測離析后上下部瀝青中SBS實際含量值,能準確評價改性瀝青的儲存穩(wěn)定性;動態(tài)剪切流變實驗需要根據(jù)瀝青高溫性能選取合理試驗溫度,否則不能很好地評價改性瀝青的儲存穩(wěn)定性。通過盲樣測試,改性瀝青SBS摻量電化學分析術(shù)的有效性和檢測準確性得到了充分的驗證;SBS摻量電化學分析術(shù)在實際工程檢測應(yīng)用中取得了良好效果,說明本檢測技術(shù)具有良好的工程檢測適用性。
[Abstract]:Polymer SBS modified asphalt is widely used in highway construction because of its outstanding properties of high temperature, low temperature, elastic recovery and temperature sensing. However, because there is still no standard at home and abroad, the rapid and accurate detection method used in SBS content detection, can not achieve the real content of SBS in modified asphalt real-time supervision, It seriously affects the real and objective evaluation of the road performance of SBS modified asphalt by quality managers. Zhu Ziqiang and Liu Zhengchun of Zhongnan University in our research group, after analyzing and summarizing the previous research results, based on the carbon and carbon double bond addition and oxidation characteristics of SBS molecule, a method of addition redox reaction is proposed to accurately measure the number of carbon and carbon double bonds. Based on this idea, a new method for the determination of SBS content was proposed by the SBS team through repeated experiments. It was called "Electrochemical Analysis of SBS content". The core principle of this detection method is to react with SBS in asphalt with known addition reagents, and then determine the consumption of addition reagents by redox titration test. Therefore, the quantity of SBS in asphalt can be obtained indirectly. The electrochemical analysis method of SBS content can realize the detection of SBS content stably, quickly and accurately, and the detection accuracy can reach 鹵0.1. According to different kinds of SBS, the amount of SBS and various admixtures, the modified asphalt with various proportions was designed and prepared. The applicability of "electrochemical method for the determination of SBS content" was proved by experiments. The test results show that this method can accurately detect the content of SBS in various proportion modified asphalt, and it has good applicability. In addition, the influence of compatibilizer, stabilizer, nano-montmorillonite and other additives on the detection accuracy is also analyzed, which ensures that the detection method can obtain accurate results in practical engineering application. Based on SBS electrochemical analysis, three groups of modified asphalt were selected for storage stability evaluation. Softening point test, SBS content test and dynamic shear rheological (DSR) test (measuring rutting factor, calculating bitumen segregation rate), combining softening point difference, SBS content, etc. The storage stability of three groups of finished asphalt was evaluated synthetically by three-phase index of segregation rate. The results show that the segregation softening point test can better evaluate the storage stability of linear SBS modified asphalt, but there is a great error in the evaluation of segregation degree of star-shaped SBS modified asphalt. SBS admixture electrochemical analysis method can directly detect the actual content of SBS in the upper and lower asphalt after segregation, and can accurately evaluate the storage stability of modified asphalt. Dynamic shear rheological experiments need to select reasonable test temperature according to the high temperature performance of asphalt, otherwise, the storage stability of modified asphalt can not be evaluated very well. The validity and accuracy of the electrochemical analysis of SBS content of modified asphalt were fully verified by blind sample test. SBS admixture electrochemical analysis technique has achieved good results in practical engineering detection, which shows that this detection technology has good applicability in engineering detection.
【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U414

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