【摘要】：采用動(dòng)態(tài)剪切流變儀(DSR)測(cè)試了4種瀝青結(jié)合料及其短期老化產(chǎn)物在不同膜厚度下的流變性能.采用基于CAM模型構(gòu)建的復(fù)數(shù)剪切模量主曲線分析了不同膜厚度下瀝青流變性之間的差異,通過(guò)Black diagram曲線初步分析了瀝青流變性隨膜厚度變化的機(jī)理及影響因素,進(jìn)一步提出用膜厚度指數(shù)B來(lái)量化分析瀝青流變性隨膜厚度變化的敏感性.結(jié)果表明:隨著膜厚度的降低,瀝青復(fù)數(shù)剪切模量呈現(xiàn)減小趨勢(shì),且此趨勢(shì)因?yàn)r青種類不同而有所差異;膜厚度指數(shù)B能夠很好地評(píng)價(jià)基質(zhì)瀝青流變性隨膜厚度變化的敏感性,但因改性和老化作用改變了瀝青結(jié)合料的分子結(jié)構(gòu)及尺寸組成,因此對(duì)于改性和老化瀝青,膜厚度指數(shù)B的適用性有所降低.
[Abstract]:The Rheological properties of four kinds of asphalt binders and their short-term aging products under different film thickness were measured by dynamic shear rheometer (DSR). The main curve of complex shear modulus based on CAM model is used to analyze the difference of asphalt Rheological properties under different film thickness. the mechanism and influencing factors of asphalt Rheological properties with film thickness are preliminarily analyzed by Black diagram curves. Furthermore, the film thickness index B is used to quantitatively analyze the sensitivity of asphalt hemorheology with film thickness. The results show that the complex shear modulus of asphalt decreases with the decrease of film thickness, and the trend varies with the type of asphalt. The film thickness index B can well evaluate the sensitivity of matrix asphalt to the variation of film thickness, but because of modification and aging, the molecular structure and size composition of asphalt binder are changed, so for modified and aged asphalt, The applicability of film thickness index B is reduced.
【作者單位】： 河海大學(xué)道路與鐵道工程研究所;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51108157) 中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(2015B17014,2015B17214)
【分類號(hào)】：U414

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