A model for the volume composition of mineral materials with a skeleton structure formed by coarse aggregate of crushed stones,and skeleton voids filled by fine weathered rock aggregates and cement as fine materials was formed.The optimal design method of gradation for the skeleton dense structure based on the theoretical formula for fine aggregates dosage was pro-posed,which was demonstrated and validated through example applications.The results show that the designed cement stabilized crushed stone mixed fine weathered rock aggregates(gradation 2#)has the smallest air void and the largest degree of compaction,which is a skeleton dense structure in practice.The 7 day-unconfined compressive strength of Grade 2# is the highest,19.1％high-er than Grade 3# and 7.9％higher than Grade 4#,meeting the basic strength requirements of the base layer of high-grade highways with heavy traffic,its tensile strength is 16.4％higher than that of Grade 3# and only 6.6％lower than Grade 4#,which verifies the feasibility and rationality of the grading optimization design method.
关键词
水泥稳定碎石/细粒风化料/细料用量/骨架密实结构/级配优化设计/力学性能
Key words
cement stabilized crushed stone/fine weathered rock aggregates/fine aggregates dosage/skeleton dense structure/optimal design of gradation/mechanical property
维普
万方数据