Anti-freezing performance and micro deterioration model for high-strength concrete modified with waste glass powder and eggshell particles

Abstract

In regions characterized by low temperatures, ensuring high frost resistance in high-strength concrete is essential as it significantly impacts the functionality of concrete structures. This research aimed to enhance the frost resistance of concrete by modifying the composition of cementitious materials to improve the microstructure of the concrete. High-strength concrete was prepared by replacing cement with a combination of waste glass powder (WGP) and eggshell particles (ESP). The study assessed the impact of various factors (individual WGP, individual ESP, combined addition waste glass powder and eggshell particles(WGP-ESP) content) on frost resistance based on spalling quantity, relative dynamic modulus, compressive strength, and alterations in the internal pore structure of the concrete. X-ray computed tomography (X-CT) was utilized for continuous monitoring of changes in the internal pore structure to establish a microscopic damage model with a three-dimensional fractal dimension. The results indicate that WGP displayed superior strength and frost resistance compared to ESP, while eggshell particles and waste glass powder high strength concrete(WEHSC) demonstrate enhanced frost resistance relative to eggshell particles high strength concrete(EHSC) and waste glass powder high strength concrete(WHSC). For all samples, W10E10 exhibited the most favorable frost resistance. After 200 freeze-thaw cycles, the compressive strength of W10E10 was 25.47 % higher than that of the control concrete. The impact of freeze-thaw cycles on the pore structure was quantified using the box-count fractal dimension, leading to the development of a micro-damage model. Additionally, the damage parameters exhibited a significant association with durability.