布敦岩沥青混合料路用性能的试验研究

为评价布敦岩沥青对基质沥青混合料的改性效果,采用A-70沥青作为基质沥青,对不同掺量布敦岩沥青混合料的路用性能进行了试验研究.结果表明:布敦岩沥青混合料的马歇尔稳定度、劈裂抗拉强度和水稳定性明显优于基质沥青混合料和SBS改性沥青混合料；其动稳定度远远高于基质沥青混合料,接近于SBS改性沥青混合料；布敦岩沥青能有效改善混合料的低温性能,但当布敦岩沥青掺量从20％增加到25％时,混合料的低温性能有所降低,因此工程应用中的布敦岩沥青掺量不宜超过25％.

Experimental Investigation into Pavement Performance of Buton Rock Asphalt Mixtures

In order to evaluate the properties of asphalt mixtures modified by Buton rock asphalt(BRA),A-70 asphalt was used as the base asphalt to test the pavement performances of modified asphalt mixtures with different BRA dosages.The results show that(1) the Marshall stability,the splitting strength and the water stability of BRA mixtures are all higher than those of A-70 asphalt and SBS modified asphalt mixtures;(2) the dynamic stability of BRA mixtures is much stronger than that of A-70 asphalt mixtures but is similar to that of SBS modified asphalt mixtures;(3) though BRA helps to effectively improve the low-temperature performance of asphalt mixtures,its dosage should not exceed 25% in engineering because the low-temperature performance of the mixtures degrades when the BRA dosage increases from 20% to 25%.