基于DMA方法的橡膠瀝青粘彈特性和高溫性能研究
發(fā)布時間:2019-04-03 20:25
【摘要】:國內外的橡膠瀝青指標體系以常規(guī)指標為主,包括布氏粘度、針(錐)入度、軟化點等,這些指標對橡膠瀝青性能評價局限性是眾所周知的。SHRP計劃對基質瀝青的粘彈性能進行了系統的研究,后又對SBS改性瀝青進行了相關研究,但是目前國內外對橡膠瀝青的粘彈性能研究基本上處于空白。因此,本文針對橡膠瀝青的高溫粘彈特性及其路用性能開展研究。 首先,從橡膠瀝青DSR試驗的適用性著手,通過不同平行板間隙的各種橡膠瀝青溫度掃描,分析了不同條件下各參數的變異性,確定了平行板間距為2mm,10%應變時能夠控制變異性水平在5%以內的橡膠瀝青DSR試驗條件。 其次,對不同橡膠粉細度、不同摻量(粘度)和不同基質瀝青的橡膠瀝青進行溫度掃描,對其58℃~82℃時的復數模量、相位角和復數粘度等數據進行分析,探索了橡膠瀝青的相態(tài)結構變化規(guī)律。計算得到車轍因子以及SBS改進車轍因子,并對其適用性進行分析,進而提出了適用于橡膠瀝青的AR車轍因子。 對不同橡膠粉細度、不同摻量和不同基質瀝青的橡膠瀝青進行了頻率掃描試驗,得到60℃時不同頻率下復數模量、相位角和復數粘度數據,對其儲存模量、損失模量和復數粘度進行主曲線擬合,并計算得到不同橡膠瀝青的位移因子和材料參數C1、C2;計算分析了橡膠瀝青的Cross模型、Carreau模型和主曲線擬合ZSV,結合橡膠瀝青的組成進行分析,建議Cross模型和Carreau模型ZSV作為其高溫性能評價指標。 對不同粘度等級的7種橡膠瀝青進行重復蠕變試驗,得到60℃時不同應力下的橡膠瀝青應變分布,分析了不同應力和不同粘度時橡膠瀝青蠕變變形特性,計算得到重復蠕變的ZSV及粘性勁度模量G V。結合橡膠瀝青粘度等級和不同基質瀝青的應變規(guī)律分析,建議重復蠕變試驗ZSV作為高溫性能評價指標。 然后,,對橡膠瀝青常規(guī)高溫指標影響因素進行相關試驗研究,分析其對橡膠瀝青高溫性能評價的適應性,并結合橡膠瀝青的改性機理分析了其粘度特性。設計了4種不同粘度、3種不同礦料級配的12種橡膠瀝青混合料,并進行了漢堡車轍試驗,得到橡膠瀝青混合料變形量、變形速率和穩(wěn)定階段斜率等混合料高溫性能指標,并結合混合料的級配、油石比和橡膠瀝青性能分析,推薦變形速率作為混合料高溫性能評價指標,變形量和穩(wěn)定階段斜率作為參考指標。 最后對不同橡膠瀝青的常規(guī)高溫指標、高溫流變指標的相關性進行分析,推薦了布氏粘度、AR車轍因子和Carreau模型的ZSV作為橡膠瀝青高溫性能評價指標,軟化點、Cross模型和重復蠕變的ZSV及粘性勁度模量G V作為參考指標;谙鹉z瀝青高溫性能指標和混合料的高溫指標相關性分析,推薦了變形速率作為橡膠瀝青混合料的高溫性能評價指標,變形量和穩(wěn)定階段斜率作為參考指標。
[Abstract]:The index system of rubber asphalt at home and abroad is mainly based on conventional indexes, including Brinell viscosity, needle (cone) penetration, softening point, etc. It is well known that the limitation of these indexes to the performance evaluation of rubber asphalt is well known. The Visco-elastic properties of the base asphalt are systematically studied in the SHRP plan, and then the SBS modified asphalt is studied in relation to the Visco-elastic properties of the asphalt. But at present, the research on viscoelastic properties of rubber asphalt at home and abroad is basically blank. Therefore, the viscoelastic properties of rubber asphalt at high temperature and its road performance are studied in this paper. Firstly, based on the applicability of rubber asphalt DSR test, the variability of each parameter under different conditions was analyzed through the temperature scanning of various rubber bitumen with different parallel plate clearance, and the distance between parallel plates was determined to be 2mm. The 10% strain can control the DSR test condition of rubber asphalt with variability level less than 5%. Secondly, the data of complex modulus, phase angle and complex viscosity of rubber asphalt with different particle fineness, different admixture (viscosity) and different base asphalt were analyzed by scanning temperature at 58 鈩
本文編號:2453546
[Abstract]:The index system of rubber asphalt at home and abroad is mainly based on conventional indexes, including Brinell viscosity, needle (cone) penetration, softening point, etc. It is well known that the limitation of these indexes to the performance evaluation of rubber asphalt is well known. The Visco-elastic properties of the base asphalt are systematically studied in the SHRP plan, and then the SBS modified asphalt is studied in relation to the Visco-elastic properties of the asphalt. But at present, the research on viscoelastic properties of rubber asphalt at home and abroad is basically blank. Therefore, the viscoelastic properties of rubber asphalt at high temperature and its road performance are studied in this paper. Firstly, based on the applicability of rubber asphalt DSR test, the variability of each parameter under different conditions was analyzed through the temperature scanning of various rubber bitumen with different parallel plate clearance, and the distance between parallel plates was determined to be 2mm. The 10% strain can control the DSR test condition of rubber asphalt with variability level less than 5%. Secondly, the data of complex modulus, phase angle and complex viscosity of rubber asphalt with different particle fineness, different admixture (viscosity) and different base asphalt were analyzed by scanning temperature at 58 鈩
本文編號:2453546
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