Method for Comprehensive Grading of Recycled Coarse Aggregate Based on Fuzzy Hierarchical Analysis
Quality of recycled aggregates has a decisive impact on performance of recycled concrete,and proper clas-sification plays a significant role for recycling aggregates effectively.The classification and grading of aggregates exhib-its fuzziness typically.It is advisable to select key material properties as the basis,and to apply fuzzy analytic hierarchy process(AHP)to establish a comprehensive methodology for quality grading.Based on material-test indicators'impact on the quality of recycled aggregate concrete and acceptance of the indicators in engineering,five material indicators were selected:mortar adhesion ratio,density,water absorption,bulk density,and crushing value,as the core evaluation indicators.Based on principles of fuzzy analysis,ridge-type membership functions were established for the five material properties as main indicators.With principles of AHP,weights of the indicators were established;and then a fuzzy grading frame was conducted based on the comprehensive evaluation membership vector.Finally,the feasibility and ra-tionality of this method were verified with case studies.
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