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Abstract

In order to study the low temperature performance of hot-mixed rubber powder-modified asphalt mortar (CR‑HMA) and SDYK type of warm-mixed rubber powder-modified asphalt mortar with surfactant (CR‑WMA‑S) under freeze-thaw cycle, trabecular three-point bending test was carried out under different salt environment (mass fraction of 0 and 8%) and freeze-thaw cycle times (0, 5, 10, 15, 20, and 25) to explore the improvement effect of salt freeze-thaw cycle on the low temperature performance of warm-mixed rubber powder modified asphalt mortar. The effect of the salt freeze-thaw cycle on the cracking characteristics of warm-mixed rubber powder-modified asphalt mortar was also analyzed. The results show that after the freeze-thaw cycle of the warm-mixed rubber powder-modified asphalt mortar, the change rule of the low temperature index is as follows. The flexural strength, maximum flexural-tensile strain, and bending strain energy density decrease significantly, and the bending stiffness modulus increases; the salt erosion on the crack resistance of asphalt mortar is more serious in salt environments. The fracture toughness of the two types of asphalt mortars decreases with the increase in the number of freeze-thaw cycles, but the SDYK type warm mixing agent has a better effect on the low temperature performance of the asphalt mortars after the salt freeze-thaw cycle.

Publication Date

11-24-2023

DOI

10.14048/j.issn.1671-2579.2023.05.032

First Page

188

Last Page

193

Submission Date

March 2025

Reference

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