Which statement about lightweight concrete is true?

Which statement about lightweight concrete is true?

• A. Magnesium Tools Should Be Used
• B. It Is Made With Expanded Aggregate
• C. Finishing Should Start Earlier
• D. More Troweling and Finishing Should Be Performed

Answer: (B)

Lightweight concrete gets its lower weight from using expanded, porous aggregates in the mix. These expanded aggregates—such as expanded shale, clay, or slag—are produced by heating materials in a kiln to create light, air-filled particles. When coated with cement paste, they reduce the overall density while still providing essential strength, which is the defining feature of this type of concrete. That’s why the statement about being made with expanded aggregate is the best choice. The other options describe finishing tools or practices that aren’t unique to lightweight concrete or aren’t universally required, so they don’t define what distinguishes this material.

Lightweight concrete gets its lower weight from using expanded, porous aggregates in the mix. These expanded aggregates—such as expanded shale, clay, or slag—are produced by heating materials in a kiln to create light, air-filled particles. When coated with cement paste, they reduce the overall density while still providing essential strength, which is the defining feature of this type of concrete. That’s why the statement about being made with expanded aggregate is the best choice. The other options describe finishing tools or practices that aren’t unique to lightweight concrete or aren’t universally required, so they don’t define what distinguishes this material.