Testing Products

Concrete Admixtures

Common Portland Cement

Mineral Admixtures (Supplementary Cementitious Materials)

Sand and Gravel (Fine and Coarse Aggregates)

Water (Mixing Water)

Steel Bars (Reinforcement Steel)

Testing Items

Admixtures:

Water reducing rate, bleeding ratio, air content, difference in setting time, slump loss over 1 hour, compressive strength ratio, shrinkage ratio, density, solid content, chloride ion content, total alkali content, pH value, sodium sulfate content

Cement:

Specific surface area, strength, setting time, water requirement for normal consistency, alkali content, free calcium oxide (free lime), chloride ion, soundness (expansion), sulfur trioxide (SO₃) content, loss on ignition (LOI)

Mineral Admixtures:

Activity index, water demand ratio, loss on ignition (LOI), silicon dioxide (SiO₂) content, moisture content, chloride ion, fineness (residue on 45 µm sieve)

Sand (Fine Aggregate):

Particle size distribution (grading), clay lump content, apparent density, mica content, bulk density, void ratio, chloride content, sulfide and sulfate content, soundness (resistance to disintegration), alkali-aggregate reaction

Gravel (Coarse Aggregate):

Particle size distribution (grading), clay and fine dust content, clay lump content, flat and elongated particle content, organic impurities content, sulfide and sulfate content, soundness, crushing value, apparent density, void ratio, water absorption, alkali-aggregate reaction

Water:

pH value, insoluble matter (suspended solids), total dissolved solids (TDS), chloride content, sulfate content, alkali content (calculated as Na₂Oₑq)

Steel Bars (Reinforcement):

Weight deviation, lower yield strength (ReL), tensile strength (Rm), total percentage elongation at maximum force (Agt), actual tensile strength / actual yield strength ratio (Au/ReL), actual yield strength / specified yield strength ratio (ReL/Rel,spec), percentage elongation after fracture (A), reverse bend test, bend test, carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S)

Testing Standards

Admixtures:

GB 8076-2008, GB/T 8077-2023, GB/T 50080-2016, GB/T 50082-2024, GB/T 50081-2019

Cement:

GB/T 17671-2021, GB/T 1346-2024, GB/T 176-2017, GB/T 208-2014, GB/T 8074-2008

Mineral Admixtures:

GB/T 18736-2017, GB/T 17671-2021, GB/T 2419-2005, GB/T 176-2017

Sand:

GB/T 14684-2022

Gravel:

GB/T 14685-2022

Water:

GB/T 6920-1986, GB/T 5750.4-2023, GB/T 11896-1989, GB/T 11899-1989, GB/T 176-2017, GB/T 11901-1989

Steel Bars (Steel wire for prestressed concrete, low-carbon steel wire, hot-rolled ribbed bars):

GB/T 5223-2014, GB/T 21839-2019, GB/T 4336-2016/XG1-2017, GB/T 228.1-2021, GB/T 238-2013, GB 1499.2-2024, GB/T 28900-2022

Service Advantages

Full coverage of core raw material testing categories for pole production, including complete indicator tests for concrete admixtures, common Portland cement, mineral admixtures, sand, gravel, water, and steel bars, strictly adhering to national standards and State Grid bidding requirements, ensuring procedural compliance and authoritative results, fully meeting the testing and control requirements of State Grid pole engineering projects.