Cement Flow (Flow Table)

What it measures

Cement flow describes how far a fresh paste or mortar spreads on a flow table after a defined number of lift-and-drop cycles. It tracks workability, cohesion, and consistency — useful when admixtures, temperature, or mixing time change.

How it is tested

Mortar is placed in a conical mould on the table centre; the table is dropped from a fixed height (12.7 mm per ASTM C230). Spread diameter or percent flow is read with a caliper or scale after the prescribed drops (ASTM C1437 defines the test steps).

Standards and reporting

ASTM C230 specifies table, mould, drop mechanism, and caliper geometry. ASTM C1437 defines the test procedure (spread measurement steps). Report drop count, mould condition, and whether SI or inch-pound accessories were used.

Common errors

Loose mounting on a light bench, greased shafts, worn cam faces, and wrong moving mass all reduce spread and mimic stiff mortar. Use a motorized flow table on a rigid block for repeatable drops.