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为节约资源,保护环境,对用硼石膏取代热拌沥青混合料普通矿物填料进行研究。采用热重-差热分析(TG-DTA)、X射线衍射(XRD)、扫描电子显微镜(SEM)以及X射线能量色散分析方法(SEM-EDAX)就硼石膏物理特性及化学组成进行分析,同时采用偏光显微镜(POM)对硼石膏微观表面特性进行观测。结果表明:硼石膏具有复杂的微观结构,晶体结构与三方硼砂相似,其烧失量为11.5%,且二氧化硅含量较高,不适合在沥青混合料中大量使用;通过制备硼石膏马歇尔试件,与石灰岩填料试件相对比,并测定两组混合料马歇尔各项指标,结果表明:硼石膏热拌沥青混合料能够减少沥青用量(与石灰岩填料相比减少了0.22%);硼石膏热拌沥青混合料适用于各等级公路的下面层,特别适用于热气候地区。
In order to save resources and protect the environment, boron mineral gypsum was used to replace ordinary mineral filler of hot mix asphalt. The physical and chemical properties of borated gypsum were analyzed by TG-DTA, XRD, SEM and X-ray energy dispersive spectroscopy (SEM-EDAX) Polarizing microscope (POM) was used to observe the microscopic surface characteristics of boron gypsum. The results show that boron gypsum has a complex microstructure with a similar crystal structure to that of tripartite borax. The loss on ignition is 11.5% and the content of silica is high, which is not suitable for mass use in asphalt mixtures. Compared with the limestone filler samples, the Marshall parameters of the two mixtures were measured. The results showed that the bauxite hot mix asphalt can reduce the asphalt dosage (0.22% compared with the limestone filler) Mixing asphalt mixture for all levels below the road, especially for hot climate areas.