Abstract
The objective of this research was to improve the scientificity of designing method of the cold patching asphalt mixture (CPAM). Firstly, the curing temperature of CPAM was studied. In addition, based on the traditional Marshall mix design method, the volume parameters of CPAM were converted, and the low-temperature workability index was added. This is the modified Marshall mix design method to determine the optimal asphalt aggregate ratio of CPAM. Then the initial strength, forming strength, storage stability, water stability and high-temperature stability of CPAM were tested. The properties of CPAM designed by using modified Marshall mix design method were compared with that of CPAM designed by using traditional Marshall mix design method and empirical formula method. The test results show that, the optimal asphalt aggregate ratio of CPAM is 5.38%. 90℃ is recommended for the oven curing temperature of the CPAM specimen. The initial strength and forming strength of CPAM meet the requirements, and the forming strength can reach about twice of the initial strength. The stability of CPAM increases with the increase of storage time. High-temperature performance is good. These properties of CPAM designed by using modified Marshall mix design method were all superior to those of the CPAM designed by using traditional Marshall mix design method and empirical formula method. And the water stability is similar to the CPAM designed by the traditional Marshall mix design method. The CPAM designed by using modified Marshall mix design method shows better road performances, which shows that modified procedure in this study is feasible and can be recommended as the mix design method of CPAM.
Highlights
Hot mix asphalt is widely used in road paving and repair because of its excellent performance as pavement (Yang et al, 2011)
There is no specificated requirement for the initial strength of cold patching asphalt mixture (CPAM)
The asphalt aggregate ratio obtained by the empirical formula method is too low, so that the initial strength is too low and fails to meet the requirement
Summary
Hot mix asphalt is widely used in road paving and repair because of its excellent performance as pavement (Yang et al, 2011). In the process of mixing, transportation, and placement of hot mix asphalt, the temperature required and its control are relatively high and strict, respectively (Li et al, 2017). Poor temperature control will cause aging of the asphalt mixture, which affects its fatigue performance and service life (Khan et al, 2016; Liu et al, 2020). Hot mix asphalt mixture cannot be produced at low temperature and in rainy weather. The damage to pavement in winter can only be repaired after April of the year, which aggravates the damage to the road and affects its comfort and safety (Ling et al, 2007).
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