Concrete Basics

What is Concrete Made of

Pouring Concrete

Concrete Mix Designs

Aggregates in Ready-Mix Concrete

Building Concrete Slabs

Concrete Testing

Seasonal Pouring Tips

Repairing Concrete

Concrete Repair

Fixing Decorative Concrete

Applications

Staining Concrete

Stamped Concrete

Concrete Countertops

Concrete Patios

Concrete Floors

Commercial Concrete

Quiz on Testing Hardened Concrete

1. How many samples are necessary when examining a construction defect?

   1. 1

   2. 3

   3. Every project is different and should be approached on a case by case basis.

2. For a suspected low-strength issue, cores must break equal to test cylinders to be acceptable.

   1. True

   2. False

3. A petrographic examination can provide which of the items below?

   1. Detection of a deleterious concrete reaction not always observable when examining the overall structure.

   2. Estimated range of percentage of concrete air content.

   3. Depth of carbonation of the concrete.

4. Air void parameters are best determined by which test?

   1. ASTM C 856

   2. ASTM C 457

5. Concrete tested for compressive strength using a rebound hammer should be used to accept or reject concrete.

   1. True

   2. False

Answers: 1-C, 2-B (average of 3 cores must be 85% of specified strength), 3-A, B and C, 4-B, 5-B

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