Effect of CO2 Curing on Strength Development, Elastic Modulus, and Abrasion Behavior of High-Strength Pervious Concrete

With the increasing demand for sustainable pavement materials, a key challenge is to achieve high strength, stiffness, and abrasion resistance in pervious concrete while maintaining its interconnected pore structure and enabling effective CO2 utilization. This study investigates the effects of CO2 curing on the strength development, elastic modulus, abrasion resistance, and microstructural characteristics of high-strength pervious concrete. Cylindrical specimens (Φ10 × 20 cm and Φ15 × 30 cm) were prepared and divided into CO2-curing and control groups, and the microstructural characteristics were examined using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the control group achieved a compressive strength of nearly 60 MPa at 90 days, with porosity below 15%, while still satisfying the permeability requirements of ACI 522. After 1 h of CO2 curing, the compressive strength varied by 0–23% relative to the control group, while smaller aggregate sizes resulted in a higher elastic modulus. The cumulative abrasion loss was less than 0.06%, indicating excellent abrasion resistance. XRD results showed a decrease in the intensity of crystalline products with increasing age, with no clear relationship between peak intensity and CO2-curing conditions. Overall, the results demonstrate that CO2 curing affects both the mechanical properties and microstructural characteristics of high-strength pervious concrete, highlighting its potential for sustainable pavement applications and CO2 utilization.