|Table of Contents|

Performance indexes distribution and correlation analysis of recycled coarse aggregate(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年02期
Page:
1-10
Research Field:
建筑材料
Publishing date:

Info

Title:
Performance indexes distribution and correlation analysis of recycled coarse aggregate
Author(s):
CHEN Xuyong;  AI Yangzheng;  CHENG Shukai;  XU Xiong
(College of Civil Engineering and Architecture, Wuhan Institute of Technology,Wuhan 430074, Hubei, China)
Keywords:
recycled coarse aggregate;  classifying index;  normality test;  correlation analysis;  aggregate performance
PACS:
TU528
DOI:
10.19815/j.jace.2021.10082
Abstract:
There are many factors and indexes affecting the quality grade of recycled coarse aggregate, which is not convenient for practical operation. Therefore, it is necessary to select the suitable index for the classifying of recycled coarse aggregate from many factors and indexes and lay a foundation for the classifying of recycled coarse aggregate. The performance indexes of 11 batches of recycled coarse aggregate were measured and the components of each batch of recycled coarse aggregate were detected. At the same time, combined with 74 different batches of recycled coarse aggregate in different literature, the distribution characteristics of water absorption, crushing index, apparent density and bulk density were studied by using SPSS statistical analysis software, and the Shapiro-Wilk normality test was carried out. The dispersion degree of the index was evaluated by the coefficient of variation.The correlation of each index was analyzed by Pearson correlation coefficient and Spearman correlation coefficient. Through the performance indexes of recycled coarse aggregate measured in the test, the linear equations of apparent density and water absorption, water absorption and crushing index, crushing index and apparent density were fitted. The results show that the micro powder content, needle and flake content and impurity content can be reduced through process adjustment and equipment modification, and can be used as the limiting factor to control the quality of recycled aggregate. The apparent density, water absorption and crushing index obey the normal distribution, and the dispersions of water absorption and crushing index are greater. Therefore, it is proposed to take water absorption and crushing index as classifying indexes. From the correlation analysis, the water absorption has a high correlation with the density indexes, which further shows that the water absorption can represent the density indexes as the classifying index.

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Last Update: 2023-03-20