Factors Influencing Fatigue Damage in Manufactured Sand-Based Ecological Self-Compacting Concrete Pavement

Ecological-self-compacting concrete (Eco-SCC) pavements offer advantages such as reduced cement consumption, lower carbon emissions, and improved economic performance. However, their durability has not been sufficiently studied. Based on the literature review and fatigue test data, the fatigue parameters of Eco-SCC were determined using the Chaboche damage evolution model. A finite element model of fatigue damage in Eco-SCC pavement structures was established to compare the fatigue damage distribution under different loading positions, identify the unfavorable loading positions, and analyze the influence of slab thickness and modulus on the durability of Eco-SCC pavements. SCC plate thickness and modulus on the durability of Eco-SCC pavement. The results show that fatigue damage under different loading positions is mainly distributed at the bottom of the slab, and controlling the bending and tensile stresses at the slab bottom is key to improving Eco SCC pavement durability. For longitudinal cracking, the most unfavorable loading positions are ranked as slab corner > slab edge > slab center; for transverse cracking, the order is slab edge > slab corner > slab center, which is consistent with the Specifications for Design of Highway Cement Concrete Pavement (JTG D40—2011). Increasing the slab thickness or decreasing the modulus effectively suppresses both transverse and longitudinal cracking of Eco-SCC pavements. To optimize longitudinal cracking control while delaying transverse cracking, it is recommended that, when the modulus is 24 000 MPa, 30 000 MPa, and 40 000 MPa, the slab thicknesses be set at 26 cm, 28 cm, and 30 cm, respectively.