To overcome the problem of paying attention to a certain index and neglecting the overall performance during selecting aggregates for a new highway, and to avoid the lack of scientificity due to too subjective classification evaluation of aggregates, the fuzzy cluster analysis was applied in the classification and selection of coarse aggregates. The basic principle and calculation steps of fuzzy clustering analysis method were given. Nine coarse aggregates produced by nine crushing plants along a new highway in Gansu were selected. The physical and mechanical properties of the course aggregate were tested. The fuzzy clustering analysis method was used to standardize with 9 technical properties of the course aggregates as original data, and the fuzzy similarity matrix was established to calculate the transitive closure for clustering. The effectiveness and reliability of the classification results were tested by F-statistic and experience method. The results show that the fuzzy clustering analysis method is applicable to the classification of coarse aggregate, and the method can provide reference for the selection of coarse aggregate before the highway road construction.
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