# Study on the Temperature-Dependence of the Modulus of LSAM-50 Pavement Materials

## TL;DR

This study examines how temperature affects the stiffness of LSAM-50 pavement materials and compares them to other common asphalt types.

## Contribution

A new temperature-dependent model for resilient modulus and a correlation model between resilient and dynamic modulus are developed for LSAM-50 pavement materials.

## Key findings

- Resilient and dynamic modulus decrease with increasing temperature and stabilize afterward.
- LSAM-50 shows higher resilient modulus than SMA-13 and AC-20 across all temperatures.
- The developed models have high correlation coefficients (R2 > 0.94).

## Abstract

To investigate the temperature dependence of the modulus of LSAM-50 flexible base asphalt pavement (LSAM-50 pavement) materials, specifically SMA-13, AC-20, and LSAM-50. The effects of temperature on the modulus of LSAM-50 pavement materials were investigated, and a temperature-dependent model of resilient modulus was established. A dynamic modulus master curve was constructed based on a generalized logarithmic Sigmoidal model. The correlation between the resilient modulus and dynamic modulus was studied, and a multiple linear regression model was developed to describe the relationship between the dynamic modulus and resilient modulus, temperature, and loading frequency. The results show that the resilient modulus and dynamic modulus gradually decrease with the increase in temperature and then tend to stabilize. The resilient modulus of LSAM-50 is higher than that of SMA-13 and AC-20 in the entire temperature range, and the dynamic modulus of LSAM-50 is higher than that of SMA-13 and AC-20 in the high-temperature range. The correlation coefficients (R2) of the established resilient modulus and dynamic modulus estimation models are greater than 0.97 and 0.94, respectively.