Freeze-thaw damage is one of the main factors affecting the service life and durability of concrete. Optimizing the microscopic pore distribution of concrete is an effective measure to improve its frost resistance. This paper takes mixed sand (machine-made sand + river sand) concrete as the research object and analyzes the influence mechanism of different content of CaO expansion agen... https://www.bekindtopets.com/quick-find-Premio-Tab-7-1-limited-choice/