What does a specific gravity value less than 1 indicate about the coarse aggregate?

• A. The material is lighter than water
• B. The material is saturated with water
• C. The aggregate is too porous for use
• D. The aggregate is only suitable for decorative use

Answer: (A)

A specific gravity value less than 1 indicates that the material is less dense than water, meaning the coarse aggregate will float in water. This characteristic is significant in the context of construction materials, as it impacts the overall weight and structural integrity of the resulting concrete or composite material. A specific gravity below 1 suggests that the aggregate may have a lightweight composition, which can be beneficial for certain applications where reducing weight is desired.

The other options address characteristics that don't align with the implication of a specific gravity value less than 1. Saturation with water, porosity, and suitability for decorative use pertain to aggregate properties and applications that are not directly indicated by the specific gravity measurement. Understanding specific gravity helps distinguish aggregates based on their suitability for structural vs. decorative purposes, aiming for efficiency and performance in construction projects.