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随着沥青混凝土配制技术及设计理论的不断发展,天然砾石骨料已越来越多地被应用于沥青混凝土心墙坝中,砾石骨料的酸碱性判定方法有多种,选择合适的方法对砾石骨料进行酸碱性评价是设计沥青混凝土配合比的前提。结合具体工程实例,研究了岩相法、SiO2含量法、碱度模数法、碱值法这四种酸碱性判定方法的应用范围及存在的问题。结果表明,同一种岩石选择不同的判定方法有可能得出不同的判定结果,提出工程实践中应先采用岩相法初步判定砾石骨料的酸碱性,然后采用SiO2含量法和碱值法进行综合判定。
With the continuous development of asphalt concrete preparation technology and design theory, natural gravel aggregates have been increasingly used in asphalt concrete core wall dams. There are many methods for judging acidity and alkalinity of gravel aggregates. Appropriate methods The evaluation of acid-base gravel aggregate is the prerequisite for the design of asphalt concrete mix ratio. Combined with specific engineering examples, the application range and existing problems of four acid-base determination methods such as lithofacies method, SiO2 content method, alkalinity modulus method and base value method were studied. The results show that different judgment methods of the same kind of rock selection may lead to different judgment results. It is suggested that the rock-phase method should be firstly used in engineering practice to determine the acidity and basicity of the gravel aggregate first, and then the SiO2 content method and the base value method Comprehensive judgment.