Bao Lei, He Min, Wang Shu, Wu Xinshuang
School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, China.
Power China Northwest Engineering Corporation Limited, Xi'an 710065, China.
Materials (Basel). 2024 Jul 18;17(14):3556. doi: 10.3390/ma17143556.
This study addresses the issue of construction stagnation affecting the adhesion and tensile properties of hydraulic asphalt concrete with acid aggregate. It investigates the impact of rest periods on the tensile characteristics of such materials under standard construction conditions. The influence of varying rest durations and asphalt temperatures on the tensile behavior of the concrete is assessed through indoor experiments. The bonding between asphalt and aggregate is examined, along with the tensile property variations of the concrete. The study found that the standstill time significantly affects the adhesion of asphalt, with the adhesion decreasing progressively with increased temperature and rest time, irrespective of the addition of anti-stripping agents. However, the inclusion of these agents can mitigate the reduction in adhesion. Furthermore, the study identified that rest duration has a more substantial impact on adhesion than temperature. The splitting tests demonstrate that the tensile properties of asphalt concrete are considerably affected by the resting time. Over a period of 0, 10, 20, and 30 days of rest, an increase in splitting strength and a decrease in splitting displacement were observed. The findings offer valuable insights for predicting the tensile performance of asphalt concrete in practical engineering applications after a period of rest.
本研究探讨了施工停滞对含酸性集料的水工沥青混凝土粘结力和拉伸性能的影响问题。研究了在标准施工条件下静置时间对这类材料拉伸特性的影响。通过室内试验评估了不同静置时间和沥青温度对混凝土拉伸行为的影响。研究了沥青与集料之间的粘结情况以及混凝土拉伸性能的变化。研究发现，静置时间对沥青的粘结力有显著影响，无论是否添加抗剥落剂，粘结力都会随着温度和静置时间的增加而逐渐降低。然而，添加这些抗剥落剂可以减轻粘结力的降低。此外，研究还发现静置时间对粘结力的影响比温度更大。劈裂试验表明，沥青混凝土的拉伸性能受静置时间的影响很大。在静置0、10、20和30天的时间段内，观察到劈裂强度增加，劈裂位移减小。这些研究结果为预测实际工程应用中沥青混凝土在静置一段时间后的拉伸性能提供了有价值的见解。
