Abstract
To investigate the response of concrete's mechanical and durability properties to different particle sizes of waste glass materials, two stages of experiments were conducted. First, comprehensive tests were carried out to separately study the effects of monodisperse glass sand and glass powder on the mechanical and durability properties of concrete. Secondly, based on the results of the comprehensive tests, orthogonal tests were designed to explore the response of composite particle sizes of glass sand and glass powder to the mechanical and durability properties of concrete, and the optimal replacement quantities were obtained. Finally, the influence mechanism of composite particle-sized glass sand and glass powder on concrete properties was revealed through scanning electron microscopy (SEM). The research results show that under monodisperse glass sand/glass powder particle sizes: the incorporation of an appropriate amount of glass sand can enhance the mechanical and durability properties of concrete, but excessive replacement and larger particle sizes can have adverse effects on the properties of concrete; due to the pozzolanic effect of glass powder, the incorporation of glass powder can improve the mechanical and durability properties of concrete, but excessive replacement quantities are not conducive to the development of early strength of concrete, and it is recommended that the replacement rate be controlled within 20%. Compared to monodisperse replacement with a single particle size, under the conditions of compounding addition, the compressive, tensile, and shear strengths of concrete were increased, with improvement magnitudes of 35.56%, 21.74%, and 13.79%, respectively. In addition, the durability of concrete was significantly enhanced, with the maximum reduction in water absorption rate being 20.73%, and the maximum decrease in chloride ion permeation being 63.10%. Under the condition of a total replacement rate of 20%, the optimal relative replacement quantities determined by orthogonal test, range analysis, and response surface methodology were 2.86% of 0.6mm glass sand, 1.43% of 1.18mm glass sand, 8.57% of 50-60μm glass powder, and 7.14% of 60-70μm glass powder. The incorporation of composite particle-sized glass sand and glass powder played a role similar to gradation in the concrete matrix, improving the microstructure of concrete, thereby enhancing the mechanical and durability properties of concrete.