莫桑比克马普托大桥钢桥面铺装用地材匹配性研究

Study on Compatibility of Local Minerals Used for Steel Deck Pavement of Maputo Bridge in Mozambique

针对莫桑比克马普托大桥钢桥面铺装所用集料和矿粉地材,首先采用NIKON LV100POL型偏反光显微镜对集料和矿粉进行矿质含量和岩性鉴定,并通过SiO_(2)含量检验其酸碱性;其次按照国内规范对集料和矿粉规格与基本性能进行检测分析,并进行SMA10和GA10沥青混合料的配合比设计与性能验证。结果表明,马普托大桥区位产的集料为(杏仁状)含铁质辉石玄武岩;集料和矿粉呈碱性且规格与各项指标均符合钢桥面铺装要求;通过配合比设计得到的沥青混合料可直接用于铺装施工。

Aiming at the local aggregate and mineral powder used for the steel deck pavement of Maputo Bridge in Mozambique,the NIKON LV100POL-type polarizing microscope is firstly used to identify the mineral content and lithology of aggregate and mineral powder,and the acid-base properties are detected by the content of SiO_(2).And then the specifications and the basic properties of aggregates and mineral powder are detected and analysed according to the local standards,and the proportioning design and performance verification of SMA10 and GA10 asphalt mixtures are carried out.The results show that the local aggregate of Maputo Bridge is the almond-shaped iron pyroxene basalt.The alkaline and the specifications as well as various indexes of the aggregates and mineral powders can meet the requirements of steel deck pavement.The asphalt mixture through the proportioning design can be directly used for the pavement construction.