Testing Products

Fly Ash

Slag (Ground Granulated Blast-Furnace Slag / GGBFS)

Pozzolanic Materials

Limestone

Testing Items

Fly Ash:

Fineness (45 μm sieve residue)

Water requirement ratio

Loss on ignition (LOI)

Moisture content

Sulfur trioxide (SO₃) content

Free calcium oxide (free lime / f-CaO) content

Total mass fraction of silicon dioxide (SiO₂), aluminum oxide (Al₂O₃), and iron oxide (Fe₂O₃)

Density

Soundness (Le-Chatelier method)

Strength activity index (SAI)

Radioactivity (radionuclide limits)

Alkali content (Na₂O + 0.658 K₂O)

Calcium sulfite hemihydrate (CaSO₃·½H₂O) content

Slag (GGBFS):

Density

Specific surface area (Blaine)

Activity index

Flow ratio (fluidity)

Initial setting time ratio

Moisture content

Sulfur trioxide (SO₃) content

Chloride ion (Cl⁻) content

Loss on ignition (LOI)

Insoluble residue

Glass (vitreous) phase content

Radioactivity (radionuclide limits)

Pozzolanic Materials:

Pozzolanicity (test for reactivity with lime)

Loss on ignition (LOI)

Sulfur trioxide (SO₃) content

Total silicon dioxide (SiO₂) + aluminum oxide (Al₂O₃) + iron oxide (Fe₂O₃) content

Activity index (strength)

Radioactivity (radionuclide limits)

Leachable heavy metal content

Alkali content (Na₂O + 0.658 K₂O)

Limestone:

Methylene blue value (MB value)

45 μm square hole sieve residue

Flow ratio (fluidity)

Calcium carbonate (CaCO₃) content

Compressive strength ratio

Moisture content

Total organic carbon (TOC) content

Alkali content (optional indicator) (Na₂O + 0.658 K₂O)

Testing Standards

Fly Ash: GB/T 1596

Slag (GGBFS): GB/T 203

Pozzolanic Materials: GB/T 2847

Limestone: GB/T 35164

Service Advantages

Professional 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.