Concrete has started setting before pouring—what will you do? | Q & A

If concrete starts setting before placement, it is a serious quality issue. Your response must prioritize structural integrity over speed.

Immediate Actions on Site 1. Stop the Pour Immediately

• Do not place partially set concrete

• Prevent compromised concrete from entering the structure

2. Assess the Degree of Setting

• Check:

  • Loss of workability

  • Stiffness / false set vs initial set

• Perform slump test if possible

3. Do NOT Add Water

• Re-tempering is not allowed

• Adding water reduces strength and durability

4. Reject the Concrete (If Initial Setting Has Begun)

• If concrete has started initial setting:

  • Reject the batch

  • Return to plant or dispose as per procedure

5. Inform Senior Engineer & Batching Plant

• Report:

  • Delay in transport

  • Traffic or breakdown

  • High ambient temperature

• Document the rejection

If Work Cannot Be Fully Stopped (Rare & Controlled Case)

(Only with written approval)

• Use approved retarding admixture

• Only if:

  • Concrete is still within allowable setting time

  • Engineer-in-charge approves

Preventive Measures for Future

• Plan pour during cooler hours

• Minimize transit time

• Use retarders in hot weather

• Ensure continuous supply and manpower readiness

One-Line Interview Answer (Perfect)

If concrete has started setting before pouring, I stop the work, do not add water, assess the condition, reject the concrete if initial setting has begun, and inform the senior engineer and batching plant.