Skip to main content

Standard tests of cement

Short answer

Field tests include checking for uniform grey colour, smoothness, cool feel, absence of lumps, no earthy smell, and a paste cake retaining shape after 24 hours under water. Laboratory tests cover fineness (≥225 m²/kg), consistency, setting time (initial ≥30 min, final ≤600 min), soundness (≤10 mm), and compressive strength at 3, 7, 28 days.

Write down about the standard tests of cement that we conduct in field and laboratory.

Field tests (quick checks)

  • Colour: uniform grey with a light greenish shade.
  • Feel: smooth when rubbed between the fingers, and free from lumps.
  • Hand test: a hand pushed into the bag feels cool; a handful thrown into water should float for some time before sinking.
  • Lump test: no hard lumps (lumps mean the cement has absorbed moisture).
  • Smell test: a paste of cement and water should not smell earthy (which would indicate clay or silt).
  • Setting (block) test: a cake made with water and kept under water for 24 hours must keep its shape without cracks.

Laboratory tests (IS 4031)

  1. Fineness (sieve or Blaine air permeability): at least 225 m²/kg.
  2. Standard consistency (Vicat apparatus).
  3. Setting time: initial at least 30 min; final at most 600 min.
  4. Soundness: Le Chatelier (at most 10 mm) and autoclave.
  5. Compressive strength: 70.6 mm mortar cubes at 3, 7 and 28 days.
  6. Specific gravity: about 3.15 (Le Chatelier flask).
  7. Heat of hydration and chemical analysis (MgO, SO3, insoluble residue, loss on ignition).

✓ Answer checked by Claude Opus 5.5 (high effort)

Related questions

All Civil Engineering Materials chapter 5 questions →