| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. APPARATUS AND SAMPLING | |||
| A1 | Slump cone per IS 1199 Part 2: 200 mm bottom × 100 mm top × 300 mm height; internally clean and damp Acceptance: Cone dimensions within tolerance; handles and foot-pieces intact; wiped clean before test | Cl. 4 — Apparatus | OK NC NA HOLD |
| A2 | Tamping rod 16 mm dia × 600 mm long with rounded end used Acceptance: Steel rod with hemispherical end; dimensions per IS | Cl. 4 — Tamping rod | OK NC NA HOLD |
| A3 | Sample collected from 3 or more portions of the batch at point of discharge Acceptance: Representative sample ≥ 0.03 cu.m; collected within 15 minutes after discharge | Cl. 6 — Sampling | OK NC NA HOLD |
| B. TEST PROCEDURE | |||
| B1 | Cone placed on smooth, level, non-absorbent surface; held down by operator's feet Acceptance: Base plate flat; cone held firm; no movement during filling | Cl. 7 — Placement | OK NC NA HOLD |
| B2 | Concrete filled in 3 layers, each ~1/3 volume, tamped 25 strokes per layer Acceptance: 25 blows per layer; blows distributed uniformly; penetrate just into previous layer | Cl. 7 — Filling & tamping | OK NC NA HOLD |
| B3 | Top surface struck off flush with top of cone using tamping rod Acceptance: Excess removed; surface smooth and level with cone top | Cl. 7 — Finishing | OK NC NA HOLD |
| B4 | Cone lifted vertically in 5-10 seconds without lateral or rotational motion Acceptance: Vertical lift within 5-10 s; total test time from start of filling to cone removal ≤ 150 s | Cl. 7 — Cone removal | OK NC NA HOLD |
| B5 | Slump measured as vertical distance between original top (cone height 300 mm) and displaced top Acceptance: Measured at highest point using rod and steel rule; record to nearest 5 mm | Cl. 7 — Measurement | OK NC NA HOLD |
| C. TEST READINGS | |||
| C1 | Record slump value (mm) — true slump; note if shear or collapse occurs, repeat test Acceptance: True slump recorded; shear/collapse → invalid result, test repeated with fresh sample | Cl. 8 — Reporting | OK NC NA HOLD |
| C2 | Observe cohesion and bleeding of slumped sample; note any segregation Acceptance: Cohesive, no segregation, minimal bleeding; if excessive → mix re-design review | Cl. 8 — Visual assessment | OK NC NA HOLD |