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Variability of aggregate properties of recycled concrete and its evaluation method

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Document pages: 9 pages

Abstract: Under the same source and regeneration technology, the characteristics of a given RA may show great changes. The same single attribute indicator of different sets may have large overall attribute differences. How do we accurately evaluate the overall performance of RA? Eight groups of Ras studies from pavement and buildings were used to evaluate the overall characteristics of RA. The parameters of aggregate are analyzed through test and investigation. The data of physical and mechanical properties show obvious dispersion and instability; Therefore, it is difficult to express the whole characteristic with any single characteristic parameter. Euclidean distance can represent the similarity of samples. The closer the distance, the more similar the characteristics. Standard deviation of Te whole property Euclidean distances for two types of RA is and , respectively, which shows that the property of building RA has great fluctuation, while pavement RA is more stable. There are certain correlations among the apparent density, water absorption, and crushed value of RAs, and the Mahalanobis distance method can directly evaluate the whole property by using its parameters: mean, variance, and covariance, and it can provide a grade evaluation model for RAs.

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