Effects of Resting Conditions on Tensile Properties of Acid Aggregate Hydraulic Asphalt Concrete

Highlights What are the main findings? The effect of resting time on asphalt adhesion was most pronounced in comparison to temperature and spalling agent dosage. What is the implication of the main finding? A combined micro- and macro-scale investigation was conducted to ascertain the impact of varying static conditions on the tensile properties of asphalt concrete.Highlights What are the main findings? The effect of resting time on asphalt adhesion was most pronounced in comparison to temperature and spalling agent dosage. What is the implication of the main finding? A combined micro- and macro-scale investigation was conducted to ascertain the impact of varying static conditions on the tensile properties of asphalt concrete.Abstract 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.