添加磷酸对沥青混凝土性能影响

Effect of Phosphoric Acid on Performance of Asphalt Concrete

以AC-20为基底沥青,磷酸作为改质剂,研究添加磷酸对沥青胶浆性质的影响,并以磷酸改质沥青作为马歇尔试体,研究添加磷酸对沥青混凝土性能的影响。经过试验,添加磷酸确实有效增加沥青胶浆的劲度,也会加速沥青胶浆的老化;增加混凝土承载力、抵抗车辙变形能力、抗张强度和耐磨损能力。添加磷酸也会降低沥青混凝土抗水侵害能力,磷酸的添加量越多,沥青混凝土水害的情形越严重,根据试验结果,建议磷酸可以添加到2%。

This study used AC-20 as the basis asphalt and phosphoric acid was used as a modifier to evaluate effect of phosphoric acid on the properties of asphalt, marshall samples were fabricated with phosphoric acid modified asphalt to study effect of phosphoric acid on the performance of asphalt concerte. According to result of tests, adding the phosphoric acid would increase asphalt stiffness, but would accelerate the as- phalt aging. Because adding the phosphoric acid would increase asphalt stiffness, the resistance of rutting, tensile strength and the resistance of wearing of asphalt concrete were all improve. But the resistance to moisture damage was reduced. Results of the tests, showed that phosphoric acid could be added about 2%.