Cement and Primary Combustion Materials Testing

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Grinding Aid Testing

Admixture testing is a critical component of building materials quality testing. It verifies whether the quality of admixture products complies with relevant standards, ensures they perform as expected in production and application, and helps avoid performance defects in building materials, reduced production efficiency, and other issues caused by non-compliant products. It provides a scientific quality basis for building materials production, engineering construction, and other processes.

Leveraging its professional testing capabilities, the center provides reliable technical support for quality control of cement admixtures.

Testing Products

Cement Grinding Aids

Coal Combustion Aids

Admixtures

Concrete Expanding Agents

Mineral Admixtures for High-Strength High-Performance Concrete

Concrete Admixtures

Testing Items

Cement Grinding Aids:

Grinding aid effectiveness, cement density after grinding aid effectiveness test, normal consistency water demand, initial setting time, final setting time, soundness, fluidity ratio, chloride ion (Cl⁻) content, drying shrinkage rate of mortar, relative strength value

Coal Combustion Aids:

Residual carbon difference

Admixtures:

Sodium sulfate (Na₂SO₄) content

Concrete Expanding Agents:

Restricted expansion rate

Mineral Admixtures for High-Strength High-Performance Concrete:

Activity index, ammonium absorption value (methylene blue value – MB value), water demand ratio

Concrete Admixtures:

Total alkali content (Na₂O + 0.658 K₂O), water reducing rate of cement mortar, fluidity of cement paste, sodium sulfate content, chloride ion content, pH value, fineness, density, moisture content, solid content

Testing Standards

Grinding aid effectiveness: GB/T 26748-2011 Appendix A

Cement density after grinding aid effectiveness test: GB/T 208-2014

Normal consistency water demand, initial setting time, final setting time, soundness: GB/T 1346-2024

Fluidity ratio: GB/T 2419-2005

Chloride ion (Cl⁻) content: GB/T 176-2017 6.31

Drying shrinkage rate of mortar: JC/T 603-2004(2017)

Residual carbon difference: GB/T 31097-2014

Sodium sulfate (Na₂SO₄) content: Q/CR 2.1-2014

Restricted expansion rate: GB/T 23439-2017

Activity index, ammonium absorption value (MB value), water demand ratio: GB/T 18736-2017

Total alkali content, water reducing rate of cement mortar, fluidity of cement paste, sodium sulfate content, chloride ion content, pH value, fineness, density, moisture content, solid content: GB/T 8077-2023

Service Advantages

National-level quality inspection center, focused on serving the quality improvement of the cement industry for nearly 40 years.

Professional team: nearly 90% of technical staff hold a bachelor's degree or higher, and nearly 70% hold engineer or higher titles.

Comprehensive service methods: full coverage of testing parameters, along with targeted skill enhancement services.

Professional service attitude: ensures objective, accurate, and impartial data.

Authoritative service capability: lead editor of numerous national and industrial standards.

Served major national key projects, including the Three Gorges Dam, Baihetan Hydropower Station, and Wudongde Hydropower Station.