Experimental Technology and Management

“铺面工程学”是一门综合性较强的课程，实验在课程教学中占据非常重要的地位。该文在原有动态模量实验基础上进行了拓展，针对不同加载工况选择不同的加载模式，并增加了数据的处理与分析环节。还对动态模量实验设计、数据处理进行了较为详细的介绍，并给出一个实际案例。通过该实验，学生可对科研过程有更深的体会。几批学生的实践与反馈结果证实，该实验课程效果良好。

[Objective] “Pavement engineering” is a comprehensive course where experiments play a vital role. To promote the progress of China's advancement of first-class undergraduate education, the course constantly explores innovative teaching approaches. Given the above considerations, this paper expands on the original dynamic modulus experiment, selecting different loading modes according to different loading conditions, and adds data analysis and processing. On the basis of the above practice, students can more deeply understand scientific research. [Methods] This paper first introduces that dynamic modulus tests require the selection of different loading modes on the basis of varying loading conditions, primarily including three modes: uniaxial compressive(UC), indirect tensile(IDT), and four-point bending(4 PB). The specific procedures and experimental parameter selections for dynamic modulus tests under these three loading modes are then elaborated. The tests involve five temperatures:-10, 4.4, 21.1, 37.8, and 54.4 ℃. At each temperature, six loading frequencies are applied—0.1, 0.5, 1, 5, 10, and 25 Hz—to capture stress-strain data across a wide temperature and frequency range. Taking the UC dynamic modulus test as an example, the detailed process of specimen preparation, experimental execution, and data processing and analysis is explained. Finally, a practical engineering case study is presented to illustrate the entire workflow of dynamic modulus testing, from material selection to data analysis. [Results] The results indicate that AC-13 mixtures with varying void ratios exhibit consistent trends in dynamic modulus: the modulus decreases significantly with rising temperature and increases with higher loading frequencies, reflecting the temperature-and frequency-dependent(viscoelastic) characteristics of asphalt mixtures. Similarly, the phase angle of different AC-13 mixtures follows the same patterns: at low and intermediate temperatures(-10 ℃, 4.4 ℃, and 21.1℃), the phase angle decreases with increasing loading frequency. At high temperatures(37.8 ℃), the phase angle initially rises and then declines with increasing frequency, with an inflection point at 1 Hz. Overall, the phase angle increases with temperature. In IDT dynamic modulus tests, mixtures with different void ratios show analogous phase angle behaviors: At 4.4 ℃ and 21.1 ℃, the phase angle decreases with higher frequencies. At 37.8 ℃, the phase angle first increases and then decreases, with inflection points at 1 or 5 Hz. For 4 PB dynamic modulus tests, the phase angle trends of the AC-13 mixtures align with those observed in UC and IDT tests: At 4.4 ℃ and 21.1 ℃, the phase angle decreases with rising frequency. At 37.8 ℃, the phase angle peaks and then declines, with inflection points at 1 or 5 Hz. The phase angle consistently increases with temperature across all tests. [Conclusions] The methods and results presented in this study support dynamic modulus testing and analysis under diverse loading conditions, advancing the field of pavement engineering. This framework also offers valuable guidance for students in designing experiments and interpreting results, enhancing both academic and practical applications in asphalt mixture performance evaluation. Dynamic modulus is also the basic input parameter of pavement mechanics analysis and structural design. Through dynamic modulus experiments, the complex characteristics of asphalt mixture modulus can be better understood. Therefore, the research results of this paper also contribute to the development and application of pavement materials.