Some common issues with concrete quality testing include variations in test results due to improper specimen handling, curing, and testing procedures. Other issues could be related to incorrect sampling, improper testing equipment calibration, or human error during the testing process.

For more detailed information, you can refer to the following sources:

1. Michigan Concrete Association - "Concrete Quality Control Problems"
2. Concrete Construction - "From the Field: Common Problems with Concrete Testing"
3. Structure Magazine - "Avoiding Problems with Concrete Testing"
4. Association of State Dam Safety Officials - "Problems with Concrete Materials"
5. Sigma Test - "How to Avoid Common Problems Caused Due to the Wrong Concreting"
6. Intelligent Concrete - "What is the Concrete Slump Test Controversy"
7. FPrimeC - "On-Site Evaluation of Concrete Strength"
8. Giatec Scientific - "The Pros and Cons of Third-Party Concrete Cylinder Tests"
9. Ground Penetrating Radar Systems - "Concrete Testing Explained"
10. Open Science Framework - "Problems of Concrete Under Compressive Strength Testing: A Review)

You can find more in-depth explanations and solutions to these issues by referring to these sources.

Sources

[PDF] Concrete Quality Control Problems: How to Address Before, During, and After the Placement[PDF] Watch for these incorrect testing practices Effects of improper field testing practices - Concrete ConstructionA Look at Discrepancies in Concrete Strength Testing - STRUCTURE magazine |Problems with Concrete Materials - Association of State Dam Safety Officials

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