en.Wedoany.com Reported - The China Building Materials Federation and the China Sand and Stone Association recently jointly issued an announcement, approving the standard "Technical Requirements for Parent Rock of Manufactured Sand and Gravel" (T/CBMF 380-2026/T/CAATB 016-2026) as a China Building Materials Association standard. This standard is the first specialized technical standard in China's manufactured sand and gravel industry to focus on source raw materials, and it will be officially implemented on August 16, 2026. The China Sand and Stone Association, in collaboration with Beijing University of Civil Engineering and Architecture and other institutions, completed the compilation of this standard after thorough research and practical verification.

In recent years, manufactured sand and gravel have become the absolute mainstay of construction sand and gravel in China, leveraging advantages such as sustainable resources and stable supply. According to statistics from the China Sand and Stone Association, China's total annual production and sales of sand and gravel reached 19.7 billion tons in 2021, with manufactured sand and gravel accounting for over 90% of the usage. These materials are widely used in major projects such as the Hong Kong-Zhuhai-Macao Bridge, the Three Gorges Dam, the China Zun Tower, and various types of infrastructure construction. As the industrialization process of the manufactured sand and gravel industry accelerates, the types of parent rock used for production are continuously expanding, from traditional limestone, basalt, and granite to tuff, gneiss, and various metal tailings. Even within the same rock type, performance indicators vary significantly. Taking limestone used for building stone, which accounts for nearly 50% of the total, as an example, its compressive strength ranges from 30 MPa to 150 MPa. The uneven quality of parent rock constrains the industry's development.

This "Technical Requirements for Parent Rock of Manufactured Sand and Gravel" standard, based on the current industry situation, clearly defines the classification of parent rock, technical indicators, test methods, and inspection rules. It innovatively proposes key parameters such as abrasiveness and crushability, filling a gap in China's standards for source raw materials of manufactured sand and gravel. The drafting group, based on domestic and international research and basic verification tests, stipulated regulations for the classification, technical requirements, test methods, inspection rules, marking, transportation, and storage of parent rock used for processing manufactured sand and gravel. The technical indicators are reasonable, and the test methods are correct. This standard works in coordination with national standards, including GB/T 14684 "Sand for Construction" and GB/T 14685 "Pebble and Crushed Stone for Construction," forming a complete "raw material-production-product" technical standard system. The review team consisted of experts from industry associations, research institutes, universities and colleges, testing organizations, and sand and gravel production and application enterprises. Both standards were unanimously approved.

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