// INTERACTIVE TOOL
Slump Recommender
Pick your structure and placement method. Get the recommended slump range, ordering tip, and IS 1199 reference.
30 sec
// Live Tool
Inputs
32°CWarm
20°C48%45°C
45 minStandard
15 min40%90 min
Live Output
Recommended Slump to Order
140mm
Range: 125–150 mm at point of placement
Slump at PlantGOOD
170mm
Adds 30 mm for slump loss in transit.
WorkabilityGOOD
High
Category per IS 1199 for the recommended slump.
VibrationGOOD
Minimal
Compaction effort needed at point of placement.
Slump LossGOOD
30mm
Estimated transit loss at given temp + travel time.
// Interpretation
What this means
// NOTE · Why this slump?
For Slab (pumped) with Concrete Pump (Boom), the recommended slump is 125–150 mm. This balances workability (concrete must flow into formwork without segregation), vibration efficiency, strength (lower slump = lower W/C = higher strength), and pumpability where required. Order at 170 mm at the plant to compensate for slump loss in transit. Reference: IS 1199 and IS 456:2000.
// CRITICAL · Never add water at site
Adding water to increase slump permanently reduces strength by ~5–7% per 10 litres added per cubic metre. If slump is wrong on receipt, request a retempering admixture from Alpha Concrete dispatch — never water.
// Context
When to use this
// What is this
Slump is a measure of concrete workability — how easily it flows. Tested using a 300 mm slump cone per IS 1199. Recommended slump varies by structure type, reinforcement density, and placement method.
// When to use it
Use this tool before ordering concrete to specify the right slump. The wrong slump means either honeycomb defects (too low) or strength loss (too high).
// Next Step
Move from numbers to a pour
// FAQ
Questions, answered
// Related Tools