泡沫沥青发泡特性的影响因素研究

Research on the Influencing Factors of Foaming Properties of Foam Asphalt

泡沫沥青作为一种新型回收路面材料的沥青胶结料,其冷再生的生产方式在进行道路的维修和养护时产生的经济效益和环境效益具有独特的循环利用优势和广阔的发展前途。为了评价沥青发泡效果,本文通过发泡机分别对中海70#沥青、SK70#沥青、镇海90#沥青和SK90#沥青4种基质沥青进行发泡试验,分析种类、标号、发泡用水量、沥青温度、发泡剂等5个因素对沥青发泡效果的影响,采用膨胀率与半衰期指标评价沥青的发泡效果。试验结果表明,发泡用水量和发泡温度是影响沥青发泡特性的最主要因素,提高发泡用水量和发泡温度能够增加发泡过程中的膨胀率,但会缩短半衰期;沥青种类对发泡效果产生影响较大,不同沥青的最佳发泡条件不同,但同一标号沥青的最佳发泡条件差异不大;此外,发泡剂的掺入能显著提高半衰期。Foam asphalt, as a novel type of recycled pavement material and asphalt binder, offers significant economic and environmental benefits through its cold regeneration production method, making it highly advantageous for recycling and promising for future development. To evaluate the effects of asphalt foaming, this study conducted foaming tests on four types of base asphalt: Zhonghai 70#, SK70#, Zhenhai 90#, and SK90#. The analysis focused on five factors: asphalt temperature, type, grade, foaming water content, and foaming agent. The effectiveness of asphalt foaming was assessed using expansion rate and half-life indicators. The test results indicated that foaming water content and foaming temperature were the most critical factors affecting the foaming characteristics of asphalt. Increasing the foaming water content and foaming temperature enhanced the expansion rate during the foaming process but shortened the half-life. The type of asphalt significantly impacted the foaming effect, with optimal foaming conditions varying across different asphalts. However, there was little difference in optimal foaming conditions for asphalts of the same grade. Additionally, the inclusion of a foaming agent significantly improved the half-life of the asphalt.