A case study on evaluating in-situ layer modulus of asphalt pavement
Cheng Huailei1，2 Liu Liping1 Sun Lijun1
1. Key Laboratory of Road and Traffic Engineering, Ministry of Education, Tongji University, Shanghai 201804, China；
2. The Hong Kong Polytechnic University,Hong Kong 100077,China
Abstract：The mechanical response of the steel deck asphalt pavement under loading provides essential references for the design of the pavement. The layer modulus of the pavement is one of the essential parameters for the mechanical response calculation of the pavement. In the past, most researchers are used to determine the modulus of the pavement layer based on the laboratory test, in which the difference between the tested modulus tested laboratory and the in-situ values of the pavement layers are neglected. To solve this problem, a method for determining the in-situ modulus of asphalt pavement layer is studied via a case study on one steel deck pavement. Firstly, the layer modulus of pavement is backcalculated based on the field measured strain using the finite element methodSecondly, the master curve of layer modulus is obtained and then validated. The back-calculated modulus of the pavement layer is compared to the corresponding laboratory modulus. It is found that the in-situ layer modulus of field pavement varies significantly at different loading conditions. The magnitude of the in-situ modulus increases with the loading frequencies but decreases with the loading temperatures, which indicates that the filed mixtures behave viscoelastically. The comparison between the laboratory and in-situ moduli of the pavement asphalt mixture shows that these two types of modulus do not accurately match under different loading conditions, and the in-situ modulus is lower than the corresponding laboratory modulus for most cases. The deviation between master curves of laboratory and in-situ moduli is more obvious when the loading frequency is relatively high or low. It is also found that the power function can be used to modify the laboratory modulus of the pavement layer, and the revised value is able to reflect the modulus characteristics of the field pavement.
程怀磊 刘黎萍 孙立军. 沥青混合料铺装层现场模量探究-以钢桥面铺装为例[J]. 土木工程学报, 2020, 53(2): 119-128.
Cheng Huailei Liu Liping Sun Lijun. A case study on evaluating in-situ layer modulus of asphalt pavement. 土木工程学报, 2020, 53(2): 119-128.
