Question

For lightweight concrete with an overdry density of 50 pcf (pounds per cubic feet), which of the following is correct?

1) Poor workability
2) Maximum slump of 4 inches
3) Maximum slump of 5 inches
4) None of the above

Answer 1

None of the provided options (poor workability, a maximum slump of 4 inches, or a maximum slump of 5 inches) are correct for concrete solely based on an overdry density of 50 pcf, as workability and slump depend on various factors beyond dry density.

Step-by-step explanation:

For lightweight concrete with an overdry density of 50 pcf (pounds per cubic feet), the correct statement would be none of the above. The workability and slump of concrete are determined by various factors such as water content, aggregate size, and mix design rather than just the dry density of the concrete. Lightweight concrete typically has an advantage of being easier to handle and place due to its reduced weight, which does not directly correlate with poor workability or a specific maximum slump value. Factors like mix proportions, use of admixtures, and intended application significantly influence these properties.