布敦岩沥青改性沥青混合料试验研究

Experimental Research of Bituminous Mixtures Modified by Buton Rock Asphalt

通过电子探针检测,测得了布敦岩沥青的矿物组成元素主要为碳、氧、硫、硅、镁、铝、钙、钾及铁等;微观形态结构表明布敦岩沥青中有的岩矿是多孔材料,沥青和岩矿相互包容.沥青组分试验表明,跟普通石油沥青相比,该种岩沥青的沥青质含量很高而胶质含量较低.不同温度的针入度结果则揭示了布敦岩中的沥青能明显改善基质沥青的高温性能,但同时降低其低温性能.高温弯曲蠕变试验进一步证实了布敦岩沥青对沥青混合料的高温性能具有显著的改性作用.

With the electronic probe detection, it is discovered that the mineral elements of the Buton Rock Asphalt （BRA） contains carbon, oxygen, sulfur, silicon, magnesium, aluminium, autunite, kalium and iron. The microcosmic shape of BRA is also studied and the results indicate that some rock in BRA is a kind of material with many holes which adsorb asphalt in and outside their walls. Group analysis of asphalt in BRA suggests that the content of the asphaltine is very high hut the pectin content is lower compared with common oil asphalt. By the analysis of the penetration at different temperatures the study shows that the asphalt in BRA can dramatically improve the high temperature performance of raw bitumen and reduce its low temperature performance at the same time. The test of bending squirm distortion at high temperature proves further that the BRA has apparent modified effects on the high temperature performance of hot mix asphalt.