T/SSXH 005-2025 General Specification for Quality Grades of Cement

Scope

Basic standards: "General Portland Cement" (GB 175), "Test Methods for Standard Consistency, Setting Time, and Stability of Cement" (GB/T 1345), etc. New indexes based on: Late-stage strength: Based on the compressive strength and its growth rate data at 28, 56, and 90 days (product inspection results from 14 production enterprises including Jiangsu Chengyi, Xuzhou Longshan, Xuzhou Guanglong Cement, and Xuzhou Zhonglian, among which the data provided by the Xuzhou Municipal Inspection and Testing Center covers different types of cement produced in Xuzhou, Lianyungang, and Yangzhou, etc.), the late-stage compressive strength indexes are specified, with the median value serving as the identification index limit. Standard consistency water consumption: Based on the water demand differences of different cement types, referring to the product inspection results from 30 production enterprises including Lianyungang Dongwang, Xinyi Hengrui Building Materials, Xuzhou Baowangshan, and Xuzhou Shenglong Powder Milling, etc. Cement uniformity: The average value of the 28-day compressive strength of the same type and strength grade of cement, with at least 20 batch numbers averaged; when there are less than 20 batch numbers, it can be calculated by combining two or three months (considering the actual situation that enterprises produce high-strength cement due to low market demand). For cement with a strength grade of 62.5 (inclusive), there is no requirement that the 28-day compressive strength should not exceed 1.1 R.

Development Information

Related Standards