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通过对不同掺量纳米膨润土及SBS、PE聚合物改性沥青的针入度、软化点等技术指标研究,确定了6种改性剂在基质沥青中的最佳掺量。采用DSR、BBR等方法对沥青的高温稳定性、低温抗裂性等路用性能进行研究,并采用SHRP手段对沥青进行分级,基质沥青为PG64-12,纳米增强基质沥青为PG70-12,说明有机膨润土改性沥青具有较基质沥青更强的抵抗高温变形的能力。纳米层状硅酸盐改性沥青不仅路用性能方面较基质沥青优越,能防止沥青混凝土路面的早期破坏、延长路面使用寿命;而且在材料、加工制备等造价方面也大大低于聚合物改性沥青。纳米材料增强基质沥青在路面工程中推广应用具有显著的经济、社会效益。
The optimum dosage of six kinds of modifiers in the matrix asphalt was determined by studying the technical indexes such as the penetration and the softening point of nanometer bentonite, SBS and PE polymer modified asphalt. DSR, BBR and other methods of asphalt high temperature stability, low temperature crack resistance and other road performance research and the use of SHRP means to grade the asphalt, the matrix pitch PG64-12, nano-enhanced asphalt as PG70-12, indicating Organic bentonite modified bitumen has stronger resistance to high temperature deformation than matrix asphalt. Nano-layered silicate modified asphalt road performance is superior to the matrix asphalt, to prevent the early destruction of asphalt concrete pavement, extending the life of the road; but also in the material, processing and preparation costs are also much lower than the polymer modification asphalt. Nanomaterials reinforced matrix asphalt in the pavement engineering application has significant economic and social benefits.