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STIFFNESS OF ASPHALT CONCRETE SURFACE LAYER FROM STRESS WAVE MEASUREMENTS.
| 题名： | STIFFNESS OF ASPHALT CONCRETE SURFACE LAYER FROM STRESS WAVE MEASUREMENTS. |
| 作者： | Aouad-MF; Stokoe-KH-II; Briggs-RC |
| 关键词： | SPECTRAL-ANALYSIS-OF-SURFACE-WAVES; STIFFNESS-; ASPHALTIC-CONCRETE; SURFACE-COURSES; PAVEMENT-LAYERS; NONDESTRUCTIVE-TESTING; TEMPERATURE-; MODULUS-OF-ELASTICITY; THICKNESS- |
| 摘要： | The spectral analysis of surface waves (SASW) method is an in situ seismic technique used to evaluate the stiffness of the asphalt concrete (AC) surface layer as well as the stiffnesses of lower layers in a pavement profile. Measurements are made at low strain levels; hence testing is nondestructive. A key element in performing SASW measurements is the generation and detection of surface waves. To sample the AC surface layer, wavelengths less than the surface layer thickness need to be generated. This requirement can only be accomplished with sources generating high frequencies (frequencies generally above 20 kHz). Two high-frequency sources, a small hammer and a piezoelectric generator, were used. Results show that the piezoelectric generator performed better than the small hammer as a high-frequency source, especially for temperatures above 80 deg F (26.67 deg C). SASW measurements made at the pavement test facility in Bryan, Texas, indicated how it is possible to quantify changes in the stiffness of the AC surface layer with ambient temperature changes. These in situ measurements along with similar measurements made on Route 1 in Austin, Texas, show how Young's modulus, E, of the AC surface layer changes with temperature in the manner predicted by the AASHTO guide for temperatures below 100 deg F (37.78 deg C). However, for temperatures above 100 deg F (37.78 deg C), the AASHTO guide overpredicts the decrease in E with increasing temperatures based on the in situ SASW results. In the case of thin AC surface layers, layers with a thickness on the order of 1 in. (2.5 cm) or less, wavelengths shorter than the thickness of the surface layer could not be generated so that the surface layer could not be evaluated with SASW tests. In such cases, compressional stress wave measurements are suggested. |
| 总页数： | Transportation Research Record. 1993. (1384) pp29-35 (10 Fig., 2 Tab., 15 Ref.) |
| 报告类型： | 科技报告 |
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