Recently, the Linyi Market Supervision Bureau in Shandong Province published the quality supervision sampling results for cement products (second batch) in 2025. The second batch of city-level product quality supervision sampling for 2025 involved seven batches of cement products in the production stage. This sampling was conducted according to standards including GB/T 17671-2021, GB/T 1346-2011, GB/T 176-2017, GB/T 2419-2005, GB 31893-2015, GB 6566-2010, and GB 175-2023, focusing on parameters such as chloride ions, compressive strength (28 days), flexural strength (28 days), limits of radioactive nuclides (external and internal exposure indices), water retention rate, trioxide sulfur content, setting times (final and initial), flexural strength (3 days), soluble chromium (VI) in cement, fineness, magnesium oxide, stability, compressive strength (3 days), loss on ignition, and stability by boiling method. No non-conforming items were found in the sampling results.
Cement is a powdered hydraulic inorganic binder that hardens when mixed with water, serving to bind granular materials like sand and gravel into mortar or concrete. As a vital construction material, cement-based mortar and concrete are known for their durability and are widely used in civil construction. Cement products can be categorized based on their use and performance into general-purpose cement, specialized cement, and specialty cement.
When selecting and using cement, it is recommended to: 1. Inspect packaging and labeling. Cement bags should be intact and properly labeled, including execution standards, producer name, production license mark (QS) and its number, cement type (including type code), strength grade, packing date, and net weight. 2. Verify certificates. Check the authenticity and validity of the production license before purchasing certified cement products. 3. Observe the cement product. Normal cement should generally be dark gray or gray; it should not be clumpy. When pinched between fingers, cement should feel fine and powdery, without any grainy texture.