I. Background on Modern Construction Sand and Gravel Demand With the acceleration of global urbanization, my country’s construction industry’s annual consumption of sand and gravel aggregates is expected to exceed 20 billion tons by 2025, with the proportion of manufactured sand increasing from 65% in 2020 to 82% in 2025. Taking the Shenzhen Qianhai Free…

Concrete is a hardened building material created by combining a chemically inert mineral aggregate (usually sand, gravel, or crushed stone), a binder (natural or synthetic cement), chemical additives, and water. Although people commonly use the word “cement” as a synonym for concrete, the terms in fact denote different substances: cement, which encompasses a wide variety…