【摘要】：高模量瀝青混合料以其優(yōu)異的抗車轍效果而廣受關(guān)注,尤其是添加劑型高模量瀝青混合料,然而添加劑對瀝青混合料性質(zhì)的影響作用機(jī)理尚不明確。以傅里葉紅外光譜儀(FIR)、瀝青抽提儀、掃描電子顯微鏡(SEM)、動(dòng)態(tài)剪切流變儀(DSR),研究高模量添加劑在瀝青混合料中的作用機(jī)理。通過FT-IR官能團(tuán)分析添加劑對瀝青的影響,分析添加劑與石料的相互作用及瀝青混合料性能,對高模量添加劑添加前后的瀝青粘彈特性差異及瀝青混合料性能進(jìn)行對比分析。研究結(jié)果表明:長鏈脂肪族碳鏈的酯類與聚烯烴接枝復(fù)配的添加劑,不損傷瀝青混合料低溫抗裂性;拌和時(shí)熔點(diǎn)在150℃~160℃,粒徑較小的添加劑B與熱集料(180℃~190℃)碰撞、被剪切并熔融分散,瀝青抽提后其在石料表面殘留少,貢獻(xiàn)率較高;SEM圖像顯示添加劑B在瀝青中分散均勻,且灰度直方圖的灰度值較集中;DSR研究發(fā)現(xiàn),熔融的添加劑使瀝青彈性模量G′增大,相位角δ降低,粘度增大,改善了瀝青流變特性;少量未熔融顆粒碾壓時(shí)嵌擠入混合料空隙中,增大了混合料內(nèi)摩阻角,提高了瀝青混合料的模量。
[Abstract]:High modulus asphalt mixture has attracted much attention for its excellent rutting resistance, especially additive type high modulus asphalt mixture. However, the mechanism of the effect of additives on the properties of asphalt mixture is not clear. The mechanism of high modulus additives in asphalt mixture was studied by Fourier transform infrared spectrometer (FIR),) and scanning electron microscope (SEM) (SEM), dynamic shear rheometer (DSR),). The influence of additives on asphalt was analyzed by FT-IR functional group. The interaction between additive and stone and the performance of asphalt mixture were analyzed. The difference of viscoelastic properties of asphalt and asphalt mixture performance before and after the addition of high modulus additive were compared and analyzed. The results show that the blend additives of long chain aliphatic carbon chain and polyolefin do not damage the cracking resistance of asphalt mixture at low temperature, and the melting point is 150 鈩，

本文編號：2201457