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| Test of deformation characteristics of graded aggregates |
| 1. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang′an University, Xi′an, Shaanxi 710064, China| 2. School of Civil Engineering, Xi′an University of Architecture and Technology, Xi′an, Shaanxi 710055, China |
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Abstract The effects of three factors of gradation composition, water mass fraction and compactness were investigated by precision unbound materials analyzer(PUMA) test and California bearing ratio(CBR) test method with repeated loading. The deformation resistance of graded aggregates was investigated by cumulative plastic deformation and elastic deformation tests，and the similarities and differences between the two tests were compared and analyzed. The results show that the deformation resistance of the graded aggregates is significantly influenced by the load in the early stage of loading, and the influence is gradually decreased with the increasing number of loadings. The cumulative plastic deformation results of the PUMA test are basically consistent with those of the repeated loading CBR test, while the elastic strain indexes are different. The elastic strain in the PUMA test is influenced by the combination of the above three factors of the graded aggregates, while the elastic strain in the repeated loading CBR test is only influenced by the compactness of graded aggregates. If the requirements for the accuracy of deformation characteristics of graded aggregates are low, the repeated load CBR test can be chosen to study the deformation characteristics of graded aggregates.Since the PUMA equipment and loading are close to the actual working conditions, the PUMA test method is chosen when the requirements for the accuracy of deformation characteristics of graded aggregates are high.
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Received: 22 July 2020
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2022, Vol. 43 
