Testing Of Building Additives

(1) Product types: concrete admixtures, cement grinding aids, mortar additives, waterproofing agents, antifreeze agents, retarders, early strength agents, water reducers (polycarboxylates, naphthalene series, etc.), air entraining agents, expansion agents, accelerators, water retaining agents, thickeners, binders, release agents, curing agents, grouting additives, putty additives, coating additives, etc.

(2) Applicable scenarios: quality control of building materials production, acceptance of incoming raw materials, adaptability testing of engineering construction, durability and safety assessment, environmental compliance testing, arbitration testing.

(1) Appearance and physical and chemical properties
Appearance, color, condition, density, viscosity, pH value, solid content, moisture content, fineness, insoluble matter, chloride ion content, alkali content, sulfate content, stability, storage stability, compatibility with cement/aggregates.

(2) Application performance of cement/concrete/mortar
Setting time (initial setting, final setting), flowability, expansion, slump loss, water reduction rate, bleeding rate, air content, compressive strength, flexural strength, impermeability, shrinkage rate, expansion rate, frost resistance, early strength, late strength, hydration heat, bond strength, water retention, and workability.

(3) Durability performance
Anti carbonization performance, resistance to chloride ion penetration, resistance to sulfate corrosion, alkali aggregate reaction inhibition effect, aging resistance, water resistance, and corrosion resistance.

(4) Environmental and safety indicators
Free formaldehyde, ammonia VOC, Benzene derivatives, heavy metals (lead, cadmium, chromium, mercury, arsenic), radioactivity, corrosiveness, acute toxicity, and limits of harmful substances.