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Admixtures & Concrete / Site problem guide

Segregation or bleeding after superplasticizer

Aggregate separates or excessive bleed water rises.

A practical decision sequence

Diagnose the cause, then verify the repair.

Use the site evidence to agree a project-specific method with the responsible engineer, concrete producer, manufacturer or specialist applicator.

01 / Symptom

What is happening?

Aggregate separates or excessive bleed water rises.

02 / Inspect and test

Evidence to collect

Check grading, fines, water content, dosage and mixing sequence.

03 / Likely mechanism

Why it can fail

An unstable mix or excessive dispersant can lose cohesion.

04 / Technical response

Choose the system

Rebalance aggregate and paste with the concrete technologist; verify admixture compatibility in trials.

05 / Site execution

Control the application

Maintain measured batching and controlled mixing; reject visibly unstable loads under the plan.

06 / Acceptance

Verify the result

Assess stability, slump flow where relevant, bleeding and hardened properties.

Avoid this shortcut

Do not compensate segregation by adding cement or admixture without a documented trial.

These guides are editorial starting points, not a project specification. Confirm the design, product data, substrate conditions and inspection plan for the actual site.
Technical references

References inform the topic; they do not endorse a specific product for this project.

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