👉If Ready-Mix Concrete (RMC) has already started to set while pouring, you must be very careful.

💫The correct action depends on how far setting has progressed.

✅ If concrete is only losing workability (early stiffening)

🚧You can add a compatibility-approved chemical admixture such as:

⭐️1. Superplasticizer / High Range Water Reducer (HRWR)

⏺Restores workability without adding water
⏺Maintains strength and durability

🏷Common types:

*Polycarboxylate Ether (PCE)
*Naphthalene-based

✅ This is the best and safest option when setting has just started.

💫2. Retarding Admixture (only if approved by mix designer)

⏺Slows down further setting
⏺Useful in hot weather or long transport time

❌ What NOT to do

⏺Do NOT add water indiscriminately → reduces strength & causes segregation
⏺Do NOT remix concrete that has begun hard setting or initial set
⏺Do NOT add cement on site

🚨 If concrete has reached initial set

⏺DO NOT try to re-temper
⏺Reject the batch
⏺Remove and replace

✅ Practical Site Action Steps

⏺1. Check concrete temperature & slump
⏺2. If slump is low but still plastic → add approved superplasticizer as per supplier dosage
⏺3. Remix truck for 30–60 revolutions
⏺4. Re-test slump before placing

📍Typical Dosage (Guide only)

⏺Super plasticizer: 0.8 – 1.5% of cement weight (Exact dosage must follow supplier data sheet)

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